HDDS-1636. Tracing id is not propagated via async datanode grpc call (#895)

hadoop-hdds/client/src/main/java/org/apache/hadoop/hdds/scm/XceiverClientGrpc.java

@@ -315,8 +315,13 @@ public class XceiverClientGrpc extends XceiverClientSpi {
     try (Scope scope = GlobalTracer.get()
         .buildSpan("XceiverClientGrpc." + request.getCmdType().name())
         .startActive(true)) {
+
+      ContainerCommandRequestProto finalPayload =
+          ContainerCommandRequestProto.newBuilder(request)
+              .setTraceID(TracingUtil.exportCurrentSpan())
+              .build();
       XceiverClientReply asyncReply =
-          sendCommandAsync(request, pipeline.getFirstNode());
+          sendCommandAsync(finalPayload, pipeline.getFirstNode());
       // TODO : for now make this API sync in nature as async requests are
       // served out of order over XceiverClientGrpc. This needs to be fixed
       // if this API is to be used for I/O path. Currently, this is not

hadoop-hdds/client/src/main/java/org/apache/hadoop/hdds/scm/client/ContainerOperationClient.java

@@ -37,7 +37,6 @@ import org.slf4j.LoggerFactory;
 
 import java.io.IOException;
 import java.util.List;
-import java.util.UUID;
 
 /**
  * This class provides the client-facing APIs of container operations.
@@ -113,8 +112,7 @@ public class ContainerOperationClient implements ScmClient {
    */
   public void createContainer(XceiverClientSpi client,
       long containerId) throws IOException {
-    String traceID = UUID.randomUUID().toString();
-    ContainerProtocolCalls.createContainer(client, containerId, traceID, null);
+    ContainerProtocolCalls.createContainer(client, containerId, null);
 
     // Let us log this info after we let SCM know that we have completed the
     // creation state.
@@ -257,9 +255,8 @@ public class ContainerOperationClient implements ScmClient {
     XceiverClientSpi client = null;
     try {
       client = xceiverClientManager.acquireClient(pipeline);
-      String traceID = UUID.randomUUID().toString();
       ContainerProtocolCalls
-          .deleteContainer(client, containerId, force, traceID, null);
+          .deleteContainer(client, containerId, force, null);
       storageContainerLocationClient
           .deleteContainer(containerId);
       if (LOG.isDebugEnabled()) {
@@ -307,10 +304,8 @@ public class ContainerOperationClient implements ScmClient {
     XceiverClientSpi client = null;
     try {
       client = xceiverClientManager.acquireClient(pipeline);
-      String traceID = UUID.randomUUID().toString();
       ReadContainerResponseProto response =
-          ContainerProtocolCalls.readContainer(client, containerID, traceID,
-              null);
+          ContainerProtocolCalls.readContainer(client, containerID, null);
       if (LOG.isDebugEnabled()) {
         LOG.debug("Read container {}, machines: {} ", containerID,
             pipeline.getNodes());
@@ -393,7 +388,6 @@ public class ContainerOperationClient implements ScmClient {
        */
       // Actually close the container on Datanode
       client = xceiverClientManager.acquireClient(pipeline);
-      String traceID = UUID.randomUUID().toString();
 
       storageContainerLocationClient.notifyObjectStageChange(
           ObjectStageChangeRequestProto.Type.container,
@@ -401,7 +395,7 @@ public class ContainerOperationClient implements ScmClient {
           ObjectStageChangeRequestProto.Op.close,
           ObjectStageChangeRequestProto.Stage.begin);
 
-      ContainerProtocolCalls.closeContainer(client, containerId, traceID,
+      ContainerProtocolCalls.closeContainer(client, containerId,
           null);
       // Notify SCM to close the container
       storageContainerLocationClient.notifyObjectStageChange(

hadoop-hdds/client/src/main/java/org/apache/hadoop/hdds/scm/storage/BlockInputStream.java

@@ -60,7 +60,6 @@ public class BlockInputStream extends InputStream implements Seekable {
   private Pipeline pipeline;
   private final Token<OzoneBlockTokenIdentifier> token;
   private final boolean verifyChecksum;
-  private final String traceID;
   private XceiverClientManager xceiverClientManager;
   private XceiverClientSpi xceiverClient;
   private boolean initialized = false;
@@ -96,13 +95,12 @@ public class BlockInputStream extends InputStream implements Seekable {
 
   public BlockInputStream(BlockID blockId, long blockLen, Pipeline pipeline,
       Token<OzoneBlockTokenIdentifier> token, boolean verifyChecksum,
-      String traceId, XceiverClientManager xceiverClientManager) {
+      XceiverClientManager xceiverClientManager) {
     this.blockID = blockId;
     this.length = blockLen;
     this.pipeline = pipeline;
     this.token = token;
     this.verifyChecksum = verifyChecksum;
-    this.traceID = traceId;
     this.xceiverClientManager = xceiverClientManager;
   }
 
@@ -166,7 +164,7 @@ public class BlockInputStream extends InputStream implements Seekable {
       DatanodeBlockID datanodeBlockID = blockID
           .getDatanodeBlockIDProtobuf();
       GetBlockResponseProto response = ContainerProtocolCalls
-          .getBlock(xceiverClient, datanodeBlockID, traceID);
+          .getBlock(xceiverClient, datanodeBlockID);
 
       chunks = response.getBlockData().getChunksList();
       success = true;
@@ -185,7 +183,7 @@ public class BlockInputStream extends InputStream implements Seekable {
    * Datanode only when a read operation is performed on for that chunk.
    */
   protected synchronized void addStream(ChunkInfo chunkInfo) {
-    chunkStreams.add(new ChunkInputStream(chunkInfo, blockID, traceID,
+    chunkStreams.add(new ChunkInputStream(chunkInfo, blockID,
         xceiverClient, verifyChecksum));
   }
 

hadoop-hdds/client/src/main/java/org/apache/hadoop/hdds/scm/storage/BlockOutputStream.java

@@ -82,7 +82,7 @@ public class BlockOutputStream extends OutputStream {
 
   private volatile BlockID blockID;
   private final String key;
-  private final String traceID;
+
   private final BlockData.Builder containerBlockData;
   private XceiverClientManager xceiverClientManager;
   private XceiverClientSpi xceiverClient;
@@ -128,7 +128,6 @@ public class BlockOutputStream extends OutputStream {
    * @param key                  chunk key
    * @param xceiverClientManager client manager that controls client
    * @param pipeline             pipeline where block will be written
-   * @param traceID              container protocol call args
    * @param chunkSize            chunk size
    * @param bufferPool           pool of buffers
    * @param streamBufferFlushSize flush size
@@ -140,13 +139,12 @@ public class BlockOutputStream extends OutputStream {
   @SuppressWarnings("parameternumber")
   public BlockOutputStream(BlockID blockID, String key,
       XceiverClientManager xceiverClientManager, Pipeline pipeline,
-      String traceID, int chunkSize, long streamBufferFlushSize,
+      int chunkSize, long streamBufferFlushSize,
       long streamBufferMaxSize, long watchTimeout, BufferPool bufferPool,
       ChecksumType checksumType, int bytesPerChecksum)
       throws IOException {
     this.blockID = blockID;
     this.key = key;
-    this.traceID = traceID;
     this.chunkSize = chunkSize;
     KeyValue keyValue =
         KeyValue.newBuilder().setKey("TYPE").setValue("KEY").build();
@@ -379,13 +377,12 @@ public class BlockOutputStream extends OutputStream {
     List<ByteBuffer> byteBufferList = bufferList;
     bufferList = null;
     Preconditions.checkNotNull(byteBufferList);
-    String requestId =
-        traceID + ContainerProtos.Type.PutBlock + chunkIndex + blockID;
+
     CompletableFuture<ContainerProtos.
         ContainerCommandResponseProto> flushFuture;
     try {
       XceiverClientReply asyncReply =
-          putBlockAsync(xceiverClient, containerBlockData.build(), requestId);
+          putBlockAsync(xceiverClient, containerBlockData.build());
       CompletableFuture<ContainerProtos.ContainerCommandResponseProto> future =
           asyncReply.getResponse();
       flushFuture = future.thenApplyAsync(e -> {
@@ -606,13 +603,10 @@ public class BlockOutputStream extends OutputStream {
         .setLen(effectiveChunkSize)
         .setChecksumData(checksumData.getProtoBufMessage())
         .build();
-    // generate a unique requestId
-    String requestId =
-        traceID + ContainerProtos.Type.WriteChunk + chunkIndex + chunkInfo
-            .getChunkName();
+
     try {
       XceiverClientReply asyncReply =
-          writeChunkAsync(xceiverClient, chunkInfo, blockID, data, requestId);
+          writeChunkAsync(xceiverClient, chunkInfo, blockID, data);
       CompletableFuture<ContainerProtos.ContainerCommandResponseProto> future =
           asyncReply.getResponse();
       future.thenApplyAsync(e -> {

hadoop-hdds/client/src/main/java/org/apache/hadoop/hdds/scm/storage/ChunkInputStream.java

@@ -49,7 +49,6 @@ public class ChunkInputStream extends InputStream implements Seekable {
   private ChunkInfo chunkInfo;
   private final long length;
   private final BlockID blockID;
-  private final String traceID;
   private XceiverClientSpi xceiverClient;
   private boolean verifyChecksum;
   private boolean allocated = false;
@@ -76,12 +75,11 @@ public class ChunkInputStream extends InputStream implements Seekable {
 
   private static final int EOF = -1;
 
-  ChunkInputStream(ChunkInfo chunkInfo, BlockID blockId,
-      String traceId, XceiverClientSpi xceiverClient, boolean verifyChecksum) {
+  ChunkInputStream(ChunkInfo chunkInfo, BlockID blockId, 
+          XceiverClientSpi xceiverClient, boolean verifyChecksum) {
     this.chunkInfo = chunkInfo;
     this.length = chunkInfo.getLen();
     this.blockID = blockId;
-    this.traceID = traceId;
     this.xceiverClient = xceiverClient;
     this.verifyChecksum = verifyChecksum;
   }
@@ -335,7 +333,7 @@ public class ChunkInputStream extends InputStream implements Seekable {
       validators.add(validator);
 
       readChunkResponse = ContainerProtocolCalls.readChunk(xceiverClient,
-          readChunkInfo, blockID, traceID, validators);
+          readChunkInfo, blockID, validators);
 
     } catch (IOException e) {
       if (e instanceof StorageContainerException) {

hadoop-hdds/client/src/test/java/org/apache/hadoop/hdds/scm/storage/TestBlockInputStream.java

@@ -63,7 +63,7 @@ public class TestBlockInputStream {
     createChunkList(5);
 
     blockStream = new DummyBlockInputStream(blockID, blockSize, null, null,
-        false, null, null);
+        false, null);
   }
 
   /**
@@ -113,10 +113,9 @@ public class TestBlockInputStream {
         Pipeline pipeline,
         Token<OzoneBlockTokenIdentifier> token,
         boolean verifyChecksum,
-        String traceId,
         XceiverClientManager xceiverClientManager) {
       super(blockId, blockLen, pipeline, token, verifyChecksum,
-          traceId, xceiverClientManager);
+          xceiverClientManager);
     }
 
     @Override
@@ -128,7 +127,7 @@ public class TestBlockInputStream {
     protected void addStream(ChunkInfo chunkInfo) {
       TestChunkInputStream testChunkInputStream = new TestChunkInputStream();
       getChunkStreams().add(testChunkInputStream.new DummyChunkInputStream(
-          chunkInfo, null, null, null, false,
+          chunkInfo, null, null, false,
           chunkDataMap.get(chunkInfo.getChunkName()).clone()));
     }
 

hadoop-hdds/client/src/test/java/org/apache/hadoop/hdds/scm/storage/TestChunkInputStream.java

@@ -66,7 +66,7 @@ public class TestChunkInputStream {
             chunkData, 0, CHUNK_SIZE).getProtoBufMessage())
         .build();
 
-    chunkStream = new DummyChunkInputStream(chunkInfo, null, null, null, true);
+    chunkStream = new DummyChunkInputStream(chunkInfo, null, null, true);
   }
 
   static byte[] generateRandomData(int length) {
@@ -85,19 +85,17 @@ public class TestChunkInputStream {
 
     DummyChunkInputStream(ChunkInfo chunkInfo,
         BlockID blockId,
-        String traceId,
         XceiverClientSpi xceiverClient,
         boolean verifyChecksum) {
-      super(chunkInfo, blockId, traceId, xceiverClient, verifyChecksum);
+      super(chunkInfo, blockId, xceiverClient, verifyChecksum);
     }
 
     public DummyChunkInputStream(ChunkInfo chunkInfo,
         BlockID blockId,
-        String traceId,
         XceiverClientSpi xceiverClient,
         boolean verifyChecksum,
         byte[] data) {
-      super(chunkInfo, blockId, traceId, xceiverClient, verifyChecksum);
+      super(chunkInfo, blockId, xceiverClient, verifyChecksum);
       chunkData = data;
     }
 

hadoop-hdds/common/src/main/java/org/apache/hadoop/hdds/scm/storage/ContainerProtocolCalls.java

@@ -92,12 +92,11 @@ public final class ContainerProtocolCalls  {
    *
    * @param xceiverClient client to perform call
    * @param datanodeBlockID blockID to identify container
-   * @param traceID container protocol call args
    * @return container protocol get block response
    * @throws IOException if there is an I/O error while performing the call
    */
   public static GetBlockResponseProto getBlock(XceiverClientSpi xceiverClient,
-      DatanodeBlockID datanodeBlockID, String traceID) throws IOException {
+      DatanodeBlockID datanodeBlockID) throws IOException {
     GetBlockRequestProto.Builder readBlockRequest = GetBlockRequestProto
         .newBuilder()
         .setBlockID(datanodeBlockID);
@@ -107,7 +106,6 @@ public final class ContainerProtocolCalls  {
         .newBuilder()
         .setCmdType(Type.GetBlock)
         .setContainerID(datanodeBlockID.getContainerID())
-        .setTraceID(traceID)
         .setDatanodeUuid(id)
         .setGetBlock(readBlockRequest);
     String encodedToken = getEncodedBlockToken(getService(datanodeBlockID));
@@ -126,13 +124,12 @@ public final class ContainerProtocolCalls  {
    *
    * @param xceiverClient client to perform call
    * @param blockID blockId for the Block
-   * @param traceID container protocol call args
    * @return container protocol getLastCommittedBlockLength response
    * @throws IOException if there is an I/O error while performing the call
    */
   public static ContainerProtos.GetCommittedBlockLengthResponseProto
       getCommittedBlockLength(
-          XceiverClientSpi xceiverClient, BlockID blockID, String traceID)
+      XceiverClientSpi xceiverClient, BlockID blockID)
       throws IOException {
     ContainerProtos.GetCommittedBlockLengthRequestProto.Builder
         getBlockLengthRequestBuilder =
@@ -143,7 +140,6 @@ public final class ContainerProtocolCalls  {
         ContainerCommandRequestProto.newBuilder()
             .setCmdType(Type.GetCommittedBlockLength)
             .setContainerID(blockID.getContainerID())
-            .setTraceID(traceID)
             .setDatanodeUuid(id)
             .setGetCommittedBlockLength(getBlockLengthRequestBuilder);
     String encodedToken = getEncodedBlockToken(new Text(blockID.
@@ -162,20 +158,19 @@ public final class ContainerProtocolCalls  {
    *
    * @param xceiverClient client to perform call
    * @param containerBlockData block data to identify container
-   * @param traceID container protocol call args
    * @return putBlockResponse
    * @throws IOException if there is an I/O error while performing the call
    */
   public static ContainerProtos.PutBlockResponseProto putBlock(
-      XceiverClientSpi xceiverClient, BlockData containerBlockData,
-      String traceID) throws IOException {
+      XceiverClientSpi xceiverClient, BlockData containerBlockData)
+      throws IOException {
     PutBlockRequestProto.Builder createBlockRequest =
         PutBlockRequestProto.newBuilder().setBlockData(containerBlockData);
     String id = xceiverClient.getPipeline().getFirstNode().getUuidString();
     ContainerCommandRequestProto.Builder builder =
         ContainerCommandRequestProto.newBuilder().setCmdType(Type.PutBlock)
             .setContainerID(containerBlockData.getBlockID().getContainerID())
-            .setTraceID(traceID).setDatanodeUuid(id)
+            .setDatanodeUuid(id)
             .setPutBlock(createBlockRequest);
     String encodedToken =
         getEncodedBlockToken(getService(containerBlockData.getBlockID()));
@@ -193,15 +188,13 @@ public final class ContainerProtocolCalls  {
    *
    * @param xceiverClient client to perform call
    * @param containerBlockData block data to identify container
-   * @param traceID container protocol call args
    * @return putBlockResponse
    * @throws IOException if there is an error while performing the call
    * @throws InterruptedException
    * @throws ExecutionException
    */
   public static XceiverClientReply putBlockAsync(
-      XceiverClientSpi xceiverClient, BlockData containerBlockData,
-      String traceID)
+      XceiverClientSpi xceiverClient, BlockData containerBlockData)
       throws IOException, InterruptedException, ExecutionException {
     PutBlockRequestProto.Builder createBlockRequest =
         PutBlockRequestProto.newBuilder().setBlockData(containerBlockData);
@@ -209,7 +202,7 @@ public final class ContainerProtocolCalls  {
     ContainerCommandRequestProto.Builder builder =
         ContainerCommandRequestProto.newBuilder().setCmdType(Type.PutBlock)
             .setContainerID(containerBlockData.getBlockID().getContainerID())
-            .setTraceID(traceID).setDatanodeUuid(id)
+            .setDatanodeUuid(id)
             .setPutBlock(createBlockRequest);
     String encodedToken =
         getEncodedBlockToken(getService(containerBlockData.getBlockID()));
@@ -226,14 +219,13 @@ public final class ContainerProtocolCalls  {
    * @param xceiverClient client to perform call
    * @param chunk information about chunk to read
    * @param blockID ID of the block
-   * @param traceID container protocol call args
    * @param validators functions to validate the response
    * @return container protocol read chunk response
    * @throws IOException if there is an I/O error while performing the call
    */
   public static ContainerProtos.ReadChunkResponseProto readChunk(
       XceiverClientSpi xceiverClient, ChunkInfo chunk, BlockID blockID,
-      String traceID, List<CheckedBiFunction> validators) throws IOException {
+      List<CheckedBiFunction> validators) throws IOException {
     ReadChunkRequestProto.Builder readChunkRequest =
         ReadChunkRequestProto.newBuilder()
             .setBlockID(blockID.getDatanodeBlockIDProtobuf())
@@ -241,7 +233,7 @@ public final class ContainerProtocolCalls  {
     String id = xceiverClient.getPipeline().getFirstNode().getUuidString();
     ContainerCommandRequestProto.Builder builder =
         ContainerCommandRequestProto.newBuilder().setCmdType(Type.ReadChunk)
-            .setContainerID(blockID.getContainerID()).setTraceID(traceID)
+            .setContainerID(blockID.getContainerID())
             .setDatanodeUuid(id).setReadChunk(readChunkRequest);
     String encodedToken = getEncodedBlockToken(new Text(blockID.
         getContainerBlockID().toString()));
@@ -261,11 +253,10 @@ public final class ContainerProtocolCalls  {
    * @param chunk information about chunk to write
    * @param blockID ID of the block
    * @param data the data of the chunk to write
-   * @param traceID container protocol call args
    * @throws IOException if there is an error while performing the call
    */
   public static void writeChunk(XceiverClientSpi xceiverClient, ChunkInfo chunk,
-      BlockID blockID, ByteString data, String traceID)
+      BlockID blockID, ByteString data)
       throws IOException {
     WriteChunkRequestProto.Builder writeChunkRequest = WriteChunkRequestProto
         .newBuilder()
@@ -277,7 +268,6 @@ public final class ContainerProtocolCalls  {
         .newBuilder()
         .setCmdType(Type.WriteChunk)
         .setContainerID(blockID.getContainerID())
-        .setTraceID(traceID)
         .setDatanodeUuid(id)
         .setWriteChunk(writeChunkRequest);
     String encodedToken = getEncodedBlockToken(new Text(blockID.
@@ -296,12 +286,11 @@ public final class ContainerProtocolCalls  {
    * @param chunk information about chunk to write
    * @param blockID ID of the block
    * @param data the data of the chunk to write
-   * @param traceID container protocol call args
    * @throws IOException if there is an I/O error while performing the call
    */
   public static XceiverClientReply writeChunkAsync(
       XceiverClientSpi xceiverClient, ChunkInfo chunk, BlockID blockID,
-      ByteString data, String traceID)
+      ByteString data)
       throws IOException, ExecutionException, InterruptedException {
     WriteChunkRequestProto.Builder writeChunkRequest =
         WriteChunkRequestProto.newBuilder()
@@ -310,7 +299,7 @@ public final class ContainerProtocolCalls  {
     String id = xceiverClient.getPipeline().getFirstNode().getUuidString();
     ContainerCommandRequestProto.Builder builder =
         ContainerCommandRequestProto.newBuilder().setCmdType(Type.WriteChunk)
-            .setContainerID(blockID.getContainerID()).setTraceID(traceID)
+            .setContainerID(blockID.getContainerID())
             .setDatanodeUuid(id).setWriteChunk(writeChunkRequest);
     String encodedToken = getEncodedBlockToken(new Text(blockID.
         getContainerBlockID().toString()));
@@ -330,13 +319,12 @@ public final class ContainerProtocolCalls  {
    * @param client - client that communicates with the container.
    * @param blockID - ID of the block
    * @param data - Data to be written into the container.
-   * @param traceID - Trace ID for logging purpose.
    * @return container protocol writeSmallFile response
    * @throws IOException
    */
   public static PutSmallFileResponseProto writeSmallFile(
-      XceiverClientSpi client, BlockID blockID, byte[] data,
-      String traceID) throws IOException {
+      XceiverClientSpi client, BlockID blockID, byte[] data)
+      throws IOException {
 
     BlockData containerBlockData =
         BlockData.newBuilder().setBlockID(blockID.getDatanodeBlockIDProtobuf())
@@ -369,7 +357,6 @@ public final class ContainerProtocolCalls  {
         ContainerCommandRequestProto.newBuilder()
             .setCmdType(Type.PutSmallFile)
             .setContainerID(blockID.getContainerID())
-            .setTraceID(traceID)
             .setDatanodeUuid(id)
             .setPutSmallFile(putSmallFileRequest);
     String encodedToken = getEncodedBlockToken(new Text(blockID.
@@ -387,12 +374,11 @@ public final class ContainerProtocolCalls  {
    * createContainer call that creates a container on the datanode.
    * @param client  - client
    * @param containerID - ID of container
-   * @param traceID - traceID
    * @param encodedToken - encodedToken if security is enabled
    * @throws IOException
    */
   public static void createContainer(XceiverClientSpi client, long containerID,
-      String traceID, String encodedToken) throws IOException {
+      String encodedToken) throws IOException {
     ContainerProtos.CreateContainerRequestProto.Builder createRequest =
         ContainerProtos.CreateContainerRequestProto
             .newBuilder();
@@ -409,7 +395,6 @@ public final class ContainerProtocolCalls  {
     request.setContainerID(containerID);
     request.setCreateContainer(createRequest.build());
     request.setDatanodeUuid(id);
-    request.setTraceID(traceID);
     client.sendCommand(request.build(), getValidatorList());
   }
 
@@ -418,12 +403,11 @@ public final class ContainerProtocolCalls  {
    *
    * @param client
    * @param force whether or not to forcibly delete the container.
-   * @param traceID
    * @param encodedToken - encodedToken if security is enabled
    * @throws IOException
    */
   public static void deleteContainer(XceiverClientSpi client, long containerID,
-      boolean force, String traceID, String encodedToken) throws IOException {
+      boolean force, String encodedToken) throws IOException {
     ContainerProtos.DeleteContainerRequestProto.Builder deleteRequest =
         ContainerProtos.DeleteContainerRequestProto.newBuilder();
     deleteRequest.setForceDelete(force);
@@ -434,7 +418,6 @@ public final class ContainerProtocolCalls  {
     request.setCmdType(ContainerProtos.Type.DeleteContainer);
     request.setContainerID(containerID);
     request.setDeleteContainer(deleteRequest);
-    request.setTraceID(traceID);
     request.setDatanodeUuid(id);
     if (encodedToken != null) {
       request.setEncodedToken(encodedToken);
@@ -447,12 +430,11 @@ public final class ContainerProtocolCalls  {
    *
    * @param client
    * @param containerID
-   * @param traceID
    * @param encodedToken - encodedToken if security is enabled
    * @throws IOException
    */
   public static void closeContainer(XceiverClientSpi client,
-      long containerID, String traceID, String encodedToken)
+      long containerID, String encodedToken)
       throws IOException {
     String id = client.getPipeline().getFirstNode().getUuidString();
 
@@ -461,7 +443,6 @@ public final class ContainerProtocolCalls  {
     request.setCmdType(Type.CloseContainer);
     request.setContainerID(containerID);
     request.setCloseContainer(CloseContainerRequestProto.getDefaultInstance());
-    request.setTraceID(traceID);
     request.setDatanodeUuid(id);
     if(encodedToken != null) {
       request.setEncodedToken(encodedToken);
@@ -473,13 +454,12 @@ public final class ContainerProtocolCalls  {
    * readContainer call that gets meta data from an existing container.
    *
    * @param client       - client
-   * @param traceID      - trace ID
    * @param encodedToken - encodedToken if security is enabled
    * @throws IOException
    */
   public static ReadContainerResponseProto readContainer(
-      XceiverClientSpi client, long containerID,
-      String traceID, String encodedToken) throws IOException {
+      XceiverClientSpi client, long containerID, String encodedToken)
+      throws IOException {
     String id = client.getPipeline().getFirstNode().getUuidString();
 
     ContainerCommandRequestProto.Builder request =
@@ -488,7 +468,6 @@ public final class ContainerProtocolCalls  {
     request.setContainerID(containerID);
     request.setReadContainer(ReadContainerRequestProto.getDefaultInstance());
     request.setDatanodeUuid(id);
-    request.setTraceID(traceID);
     if(encodedToken != null) {
       request.setEncodedToken(encodedToken);
     }
@@ -503,12 +482,11 @@ public final class ContainerProtocolCalls  {
    *
    * @param client
    * @param blockID - ID of the block
-   * @param traceID - trace ID
    * @return GetSmallFileResponseProto
    * @throws IOException
    */
   public static GetSmallFileResponseProto readSmallFile(XceiverClientSpi client,
-      BlockID blockID, String traceID) throws IOException {
+      BlockID blockID) throws IOException {
     GetBlockRequestProto.Builder getBlock = GetBlockRequestProto
         .newBuilder()
         .setBlockID(blockID.getDatanodeBlockIDProtobuf());
@@ -522,7 +500,6 @@ public final class ContainerProtocolCalls  {
         .newBuilder()
         .setCmdType(Type.GetSmallFile)
         .setContainerID(blockID.getContainerID())
-        .setTraceID(traceID)
         .setDatanodeUuid(id)
         .setGetSmallFile(getSmallFileRequest);
     String encodedToken = getEncodedBlockToken(new Text(blockID.

hadoop-hdds/common/src/main/java/org/apache/hadoop/hdds/tracing/StringCodec.java

@@ -45,7 +45,7 @@ public class StringCodec implements Codec<StringBuilder> {
     if (value != null && !value.equals("")) {
       String[] parts = value.split(":");
       if (parts.length != 4) {
-        LOG.trace("MalformedTracerStateString: {}", value);
+        LOG.debug("MalformedTracerStateString: {}", value);
         throw new MalformedTracerStateStringException(value);
       } else {
         String traceId = parts[0];

hadoop-ozone/client/src/main/java/org/apache/hadoop/ozone/client/io/BlockOutputStreamEntry.java

@@ -47,7 +47,6 @@ public final class BlockOutputStreamEntry extends OutputStream {
   private final Pipeline pipeline;
   private final ChecksumType checksumType;
   private final int bytesPerChecksum;
-  private final String requestId;
   private final int chunkSize;
   // total number of bytes that should be written to this stream
   private final long length;
@@ -73,7 +72,6 @@ public final class BlockOutputStreamEntry extends OutputStream {
     this.key = key;
     this.xceiverClientManager = xceiverClientManager;
     this.pipeline = pipeline;
-    this.requestId = requestId;
     this.chunkSize = chunkSize;
     this.token = token;
     this.length = length;
@@ -111,7 +109,7 @@ public final class BlockOutputStreamEntry extends OutputStream {
       }
       this.outputStream =
           new BlockOutputStream(blockID, key, xceiverClientManager,
-              pipeline, requestId, chunkSize, streamBufferFlushSize,
+              pipeline, chunkSize, streamBufferFlushSize,
               streamBufferMaxSize, watchTimeout, bufferPool, checksumType,
               bytesPerChecksum);
     }
@@ -324,10 +322,6 @@ public final class BlockOutputStreamEntry extends OutputStream {
     return pipeline;
   }
 
-  public String getRequestId() {
-    return requestId;
-  }
-
   public int getChunkSize() {
     return chunkSize;
   }

hadoop-ozone/client/src/main/java/org/apache/hadoop/ozone/client/io/KeyInputStream.java

@@ -76,21 +76,21 @@ public class KeyInputStream extends InputStream implements Seekable {
    * For each block in keyInfo, add a BlockInputStream to blockStreams.
    */
   public static LengthInputStream getFromOmKeyInfo(OmKeyInfo keyInfo,
-      XceiverClientManager xceiverClientManager, String requestId,
+      XceiverClientManager xceiverClientManager,
       boolean verifyChecksum) {
     List<OmKeyLocationInfo> keyLocationInfos = keyInfo
         .getLatestVersionLocations().getBlocksLatestVersionOnly();
 
     KeyInputStream keyInputStream = new KeyInputStream();
     keyInputStream.initialize(keyInfo.getKeyName(), keyLocationInfos,
-        xceiverClientManager, requestId, verifyChecksum);
+        xceiverClientManager, verifyChecksum);
 
     return new LengthInputStream(keyInputStream, keyInputStream.length);
   }
 
   private synchronized void initialize(String keyName,
       List<OmKeyLocationInfo> blockInfos,
-      XceiverClientManager xceiverClientManager, String requestId,
+      XceiverClientManager xceiverClientManager,
       boolean verifyChecksum) {
     this.key = keyName;
     this.blockOffsets = new long[blockInfos.size()];
@@ -100,7 +100,7 @@ public class KeyInputStream extends InputStream implements Seekable {
       LOG.debug("Adding stream for accessing {}. The stream will be " +
           "initialized later.", omKeyLocationInfo);
 
-      addStream(omKeyLocationInfo, xceiverClientManager, requestId,
+      addStream(omKeyLocationInfo, xceiverClientManager,
           verifyChecksum);
 
       this.blockOffsets[i] = keyLength;
@@ -116,11 +116,11 @@ public class KeyInputStream extends InputStream implements Seekable {
    * the block for the first time.
    */
   private synchronized void addStream(OmKeyLocationInfo blockInfo,
-      XceiverClientManager xceiverClientMngr, String clientRequestId,
+      XceiverClientManager xceiverClientMngr,
       boolean verifyChecksum) {
     blockStreams.add(new BlockInputStream(blockInfo.getBlockID(),
         blockInfo.getLength(), blockInfo.getPipeline(), blockInfo.getToken(),
-        verifyChecksum, clientRequestId, xceiverClientMngr));
+        verifyChecksum, xceiverClientMngr));
   }
 
   @VisibleForTesting

hadoop-ozone/client/src/main/java/org/apache/hadoop/ozone/client/rpc/RpcClient.java

@@ -654,7 +654,6 @@ public class RpcClient implements ClientProtocol, KeyProviderTokenIssuer {
       throws IOException {
     HddsClientUtils.verifyResourceName(volumeName, bucketName);
     Preconditions.checkNotNull(keyName);
-    String requestId = UUID.randomUUID().toString();
     OmKeyArgs keyArgs = new OmKeyArgs.Builder()
         .setVolumeName(volumeName)
         .setBucketName(bucketName)
@@ -662,7 +661,7 @@ public class RpcClient implements ClientProtocol, KeyProviderTokenIssuer {
         .setRefreshPipeline(true)
         .build();
     OmKeyInfo keyInfo = ozoneManagerClient.lookupKey(keyArgs);
-    return createInputStream(keyInfo, requestId);
+    return createInputStream(keyInfo);
   }
 
   @Override
@@ -984,7 +983,7 @@ public class RpcClient implements ClientProtocol, KeyProviderTokenIssuer {
         .setKeyName(keyName)
         .build();
     OmKeyInfo keyInfo = ozoneManagerClient.lookupFile(keyArgs);
-    return createInputStream(keyInfo, UUID.randomUUID().toString());
+    return createInputStream(keyInfo);
   }
 
   @Override
@@ -1069,10 +1068,10 @@ public class RpcClient implements ClientProtocol, KeyProviderTokenIssuer {
     return ozoneManagerClient.getAcl(obj);
   }
 
-  private OzoneInputStream createInputStream(OmKeyInfo keyInfo,
-      String requestId) throws IOException {
+  private OzoneInputStream createInputStream(OmKeyInfo keyInfo)
+      throws IOException {
     LengthInputStream lengthInputStream = KeyInputStream
-        .getFromOmKeyInfo(keyInfo, xceiverClientManager, requestId,
+        .getFromOmKeyInfo(keyInfo, xceiverClientManager,
             verifyChecksum);
     FileEncryptionInfo feInfo = keyInfo.getFileEncryptionInfo();
     if (feInfo != null) {

hadoop-ozone/integration-test/src/test/java/org/apache/hadoop/ozone/TestContainerStateMachineIdempotency.java

@@ -44,7 +44,6 @@ import org.junit.BeforeClass;
 import org.junit.Test;
 
 import java.io.IOException;
-import java.util.UUID;
 
 /**
  * Tests the idempotent operations in ContainerStateMachine.
@@ -80,7 +79,6 @@ public class TestContainerStateMachineIdempotency {
 
   @Test
   public void testContainerStateMachineIdempotency() throws Exception {
-    String traceID = UUID.randomUUID().toString();
     ContainerWithPipeline container = storageContainerLocationClient
         .allocateContainer(HddsProtos.ReplicationType.RATIS,
             HddsProtos.ReplicationFactor.ONE, containerOwner);
@@ -89,8 +87,7 @@ public class TestContainerStateMachineIdempotency {
     XceiverClientSpi client = xceiverClientManager.acquireClient(pipeline);
     try {
       //create the container
-      ContainerProtocolCalls.createContainer(client, containerID, traceID,
-          null);
+      ContainerProtocolCalls.createContainer(client, containerID, null);
       // call create Container again
       BlockID blockID = ContainerTestHelper.getTestBlockID(containerID);
       byte[] data =
@@ -112,10 +109,8 @@ public class TestContainerStateMachineIdempotency {
       client.sendCommand(putKeyRequest);
 
       // close container call
-      ContainerProtocolCalls.closeContainer(client, containerID, traceID,
-          null);
-      ContainerProtocolCalls.closeContainer(client, containerID, traceID,
-          null);
+      ContainerProtocolCalls.closeContainer(client, containerID, null);
+      ContainerProtocolCalls.closeContainer(client, containerID, null);
     } catch (IOException ioe) {
       Assert.fail("Container operation failed" + ioe);
     }

hadoop-ozone/integration-test/src/test/java/org/apache/hadoop/ozone/scm/TestContainerSmallFile.java

@@ -41,8 +41,6 @@ import org.junit.Rule;
 import org.junit.Test;
 import org.junit.rules.ExpectedException;
 
-import java.util.UUID;
-
 /**
  * Test Container calls.
  */
@@ -80,7 +78,6 @@ public class TestContainerSmallFile {
 
   @Test
   public void testAllocateWrite() throws Exception {
-    String traceID = UUID.randomUUID().toString();
     ContainerWithPipeline container =
         storageContainerLocationClient.allocateContainer(
             xceiverClientManager.getType(),
@@ -88,14 +85,14 @@ public class TestContainerSmallFile {
     XceiverClientSpi client = xceiverClientManager
         .acquireClient(container.getPipeline());
     ContainerProtocolCalls.createContainer(client,
-        container.getContainerInfo().getContainerID(), traceID, null);
+        container.getContainerInfo().getContainerID(), null);
 
     BlockID blockID = ContainerTestHelper.getTestBlockID(
         container.getContainerInfo().getContainerID());
     ContainerProtocolCalls.writeSmallFile(client, blockID,
-        "data123".getBytes(), traceID);
+        "data123".getBytes());
     ContainerProtos.GetSmallFileResponseProto response =
-        ContainerProtocolCalls.readSmallFile(client, blockID, traceID);
+        ContainerProtocolCalls.readSmallFile(client, blockID);
     String readData = response.getData().getData().toStringUtf8();
     Assert.assertEquals("data123", readData);
     xceiverClientManager.releaseClient(client, false);
@@ -103,7 +100,6 @@ public class TestContainerSmallFile {
 
   @Test
   public void testInvalidBlockRead() throws Exception {
-    String traceID = UUID.randomUUID().toString();
     ContainerWithPipeline container =
         storageContainerLocationClient.allocateContainer(
             xceiverClientManager.getType(),
@@ -111,7 +107,7 @@ public class TestContainerSmallFile {
     XceiverClientSpi client = xceiverClientManager
         .acquireClient(container.getPipeline());
     ContainerProtocolCalls.createContainer(client,
-        container.getContainerInfo().getContainerID(), traceID, null);
+        container.getContainerInfo().getContainerID(), null);
 
     thrown.expect(StorageContainerException.class);
     thrown.expectMessage("Unable to find the block");
@@ -120,13 +116,12 @@ public class TestContainerSmallFile {
         container.getContainerInfo().getContainerID());
     // Try to read a Key Container Name
     ContainerProtos.GetSmallFileResponseProto response =
-        ContainerProtocolCalls.readSmallFile(client, blockID, traceID);
+        ContainerProtocolCalls.readSmallFile(client, blockID);
     xceiverClientManager.releaseClient(client, false);
   }
 
   @Test
   public void testInvalidContainerRead() throws Exception {
-    String traceID = UUID.randomUUID().toString();
     long nonExistContainerID = 8888L;
     ContainerWithPipeline container =
         storageContainerLocationClient.allocateContainer(
@@ -135,11 +130,11 @@ public class TestContainerSmallFile {
     XceiverClientSpi client = xceiverClientManager
         .acquireClient(container.getPipeline());
     ContainerProtocolCalls.createContainer(client,
-        container.getContainerInfo().getContainerID(), traceID, null);
+        container.getContainerInfo().getContainerID(), null);
     BlockID blockID = ContainerTestHelper.getTestBlockID(
         container.getContainerInfo().getContainerID());
     ContainerProtocolCalls.writeSmallFile(client, blockID,
-        "data123".getBytes(), traceID);
+        "data123".getBytes());
 
     thrown.expect(StorageContainerException.class);
     thrown.expectMessage("ContainerID 8888 does not exist");
@@ -148,13 +143,12 @@ public class TestContainerSmallFile {
     ContainerProtos.GetSmallFileResponseProto response =
         ContainerProtocolCalls.readSmallFile(client,
             ContainerTestHelper.getTestBlockID(
-                nonExistContainerID), traceID);
+                nonExistContainerID));
     xceiverClientManager.releaseClient(client, false);
   }
 
   @Test
   public void testReadWriteWithBCSId() throws Exception {
-    String traceID = UUID.randomUUID().toString();
     ContainerWithPipeline container =
         storageContainerLocationClient.allocateContainer(
             HddsProtos.ReplicationType.RATIS,
@@ -162,20 +156,20 @@ public class TestContainerSmallFile {
     XceiverClientSpi client = xceiverClientManager
         .acquireClient(container.getPipeline());
     ContainerProtocolCalls.createContainer(client,
-        container.getContainerInfo().getContainerID(), traceID, null);
+        container.getContainerInfo().getContainerID(), null);
 
     BlockID blockID1 = ContainerTestHelper.getTestBlockID(
         container.getContainerInfo().getContainerID());
     ContainerProtos.PutSmallFileResponseProto responseProto =
         ContainerProtocolCalls
-            .writeSmallFile(client, blockID1, "data123".getBytes(), traceID);
+            .writeSmallFile(client, blockID1, "data123".getBytes());
     long bcsId = responseProto.getCommittedBlockLength().getBlockID()
         .getBlockCommitSequenceId();
     try {
       blockID1.setBlockCommitSequenceId(bcsId + 1);
       //read a file with higher bcsId than the container bcsId
       ContainerProtocolCalls
-          .readSmallFile(client, blockID1, traceID);
+          .readSmallFile(client, blockID1);
       Assert.fail("Expected exception not thrown");
     } catch (StorageContainerException sce) {
       Assert
@@ -186,12 +180,12 @@ public class TestContainerSmallFile {
     BlockID blockID2 = ContainerTestHelper
         .getTestBlockID(container.getContainerInfo().getContainerID());
     ContainerProtocolCalls
-        .writeSmallFile(client, blockID2, "data123".getBytes(), traceID);
+        .writeSmallFile(client, blockID2, "data123".getBytes());
 
     try {
       blockID1.setBlockCommitSequenceId(bcsId + 1);
       //read a file with higher bcsId than the committed bcsId for the block
-      ContainerProtocolCalls.readSmallFile(client, blockID1, traceID);
+      ContainerProtocolCalls.readSmallFile(client, blockID1);
       Assert.fail("Expected exception not thrown");
     } catch (StorageContainerException sce) {
       Assert
@@ -199,7 +193,7 @@ public class TestContainerSmallFile {
     }
     blockID1.setBlockCommitSequenceId(bcsId);
     ContainerProtos.GetSmallFileResponseProto response =
-        ContainerProtocolCalls.readSmallFile(client, blockID1, traceID);
+        ContainerProtocolCalls.readSmallFile(client, blockID1);
     String readData = response.getData().getData().toStringUtf8();
     Assert.assertEquals("data123", readData);
     xceiverClientManager.releaseClient(client, false);

hadoop-ozone/integration-test/src/test/java/org/apache/hadoop/ozone/scm/TestGetCommittedBlockLengthAndPutKey.java

@@ -46,9 +46,6 @@ import org.junit.Assert;
 import org.junit.BeforeClass;
 import org.junit.Test;
 
-
-import java.util.UUID;
-
 /**
  * Test Container calls.
  */
@@ -85,7 +82,6 @@ public class TestGetCommittedBlockLengthAndPutKey {
   @Test
   public void tesGetCommittedBlockLength() throws Exception {
     ContainerProtos.GetCommittedBlockLengthResponseProto response;
-    String traceID = UUID.randomUUID().toString();
     ContainerWithPipeline container = storageContainerLocationClient
         .allocateContainer(xceiverClientManager.getType(),
             HddsProtos.ReplicationFactor.ONE, containerOwner);
@@ -93,7 +89,7 @@ public class TestGetCommittedBlockLengthAndPutKey {
     Pipeline pipeline = container.getPipeline();
     XceiverClientSpi client = xceiverClientManager.acquireClient(pipeline);
     //create the container
-    ContainerProtocolCalls.createContainer(client, containerID, traceID, null);
+    ContainerProtocolCalls.createContainer(client, containerID, null);
 
     BlockID blockID = ContainerTestHelper.getTestBlockID(containerID);
     byte[] data =
@@ -109,7 +105,7 @@ public class TestGetCommittedBlockLengthAndPutKey {
             .getPutBlockRequest(pipeline, writeChunkRequest.getWriteChunk());
     client.sendCommand(putKeyRequest);
     response = ContainerProtocolCalls
-        .getCommittedBlockLength(client, blockID, traceID);
+        .getCommittedBlockLength(client, blockID);
     // make sure the block ids in the request and response are same.
     Assert.assertTrue(
         BlockID.getFromProtobuf(response.getBlockID()).equals(blockID));
@@ -119,22 +115,21 @@ public class TestGetCommittedBlockLengthAndPutKey {
 
   @Test
   public void testGetCommittedBlockLengthForInvalidBlock() throws Exception {
-    String traceID = UUID.randomUUID().toString();
     ContainerWithPipeline container = storageContainerLocationClient
         .allocateContainer(xceiverClientManager.getType(),
             HddsProtos.ReplicationFactor.ONE, containerOwner);
     long containerID = container.getContainerInfo().getContainerID();
     XceiverClientSpi client = xceiverClientManager
         .acquireClient(container.getPipeline());
-    ContainerProtocolCalls.createContainer(client, containerID, traceID, null);
+    ContainerProtocolCalls.createContainer(client, containerID, null);
 
     BlockID blockID = ContainerTestHelper.getTestBlockID(containerID);
     // move the container to closed state
-    ContainerProtocolCalls.closeContainer(client, containerID, traceID, null);
+    ContainerProtocolCalls.closeContainer(client, containerID, null);
     try {
       // There is no block written inside the container. The request should
       // fail.
-      ContainerProtocolCalls.getCommittedBlockLength(client, blockID, traceID);
+      ContainerProtocolCalls.getCommittedBlockLength(client, blockID);
       Assert.fail("Expected exception not thrown");
     } catch (StorageContainerException sce) {
       Assert.assertTrue(sce.getMessage().contains("Unable to find the block"));
@@ -145,7 +140,6 @@ public class TestGetCommittedBlockLengthAndPutKey {
   @Test
   public void tesPutKeyResposne() throws Exception {
     ContainerProtos.PutBlockResponseProto response;
-    String traceID = UUID.randomUUID().toString();
     ContainerWithPipeline container = storageContainerLocationClient
         .allocateContainer(HddsProtos.ReplicationType.RATIS,
             HddsProtos.ReplicationFactor.ONE, containerOwner);
@@ -153,7 +147,7 @@ public class TestGetCommittedBlockLengthAndPutKey {
     Pipeline pipeline = container.getPipeline();
     XceiverClientSpi client = xceiverClientManager.acquireClient(pipeline);
     //create the container
-    ContainerProtocolCalls.createContainer(client, containerID, traceID, null);
+    ContainerProtocolCalls.createContainer(client, containerID, null);
 
     BlockID blockID = ContainerTestHelper.getTestBlockID(containerID);
     byte[] data =

hadoop-ozone/integration-test/src/test/java/org/apache/hadoop/ozone/scm/TestXceiverClientManager.java

@@ -18,7 +18,6 @@
 package org.apache.hadoop.ozone.scm;
 
 import com.google.common.cache.Cache;
-import org.apache.commons.lang3.RandomStringUtils;
 import org.apache.hadoop.hdds.scm.container.common.helpers.ContainerWithPipeline;
 import org.apache.hadoop.io.IOUtils;
 import org.apache.hadoop.ozone.MiniOzoneCluster;
@@ -144,9 +143,8 @@ public class TestXceiverClientManager {
             + container1.getContainerInfo().getReplicationType());
     Assert.assertEquals(null, nonExistent1);
     // However container call should succeed because of refcount on the client.
-    String traceID1 = "trace" + RandomStringUtils.randomNumeric(4);
     ContainerProtocolCalls.createContainer(client1,
-        container1.getContainerInfo().getContainerID(), traceID1, null);
+        container1.getContainerInfo().getContainerID(), null);
 
     // After releasing the client, this connection should be closed
     // and any container operations should fail
@@ -155,7 +153,7 @@ public class TestXceiverClientManager {
     String expectedMessage = "This channel is not connected.";
     try {
       ContainerProtocolCalls.createContainer(client1,
-          container1.getContainerInfo().getContainerID(), traceID1, null);
+          container1.getContainerInfo().getContainerID(), null);
       Assert.fail("Create container should throw exception on closed"
           + "client");
     } catch (Exception e) {
@@ -202,11 +200,10 @@ public class TestXceiverClientManager {
     Assert.assertEquals(null, nonExistent);
 
     // Any container operation should now fail
-    String traceID2 = "trace" + RandomStringUtils.randomNumeric(4);
     String expectedMessage = "This channel is not connected.";
     try {
       ContainerProtocolCalls.createContainer(client1,
-          container1.getContainerInfo().getContainerID(), traceID2, null);
+          container1.getContainerInfo().getContainerID(), null);
       Assert.fail("Create container should throw exception on closed"
           + "client");
     } catch (Exception e) {

hadoop-ozone/objectstore-service/src/main/java/org/apache/hadoop/ozone/web/storage/DistributedStorageHandler.java

@@ -503,7 +503,7 @@ public final class DistributedStorageHandler implements StorageHandler {
         .build();
     OmKeyInfo keyInfo = ozoneManagerClient.lookupKey(keyArgs);
     return KeyInputStream.getFromOmKeyInfo(
-        keyInfo, xceiverClientManager, args.getRequestID(), verifyChecksum);
+        keyInfo, xceiverClientManager, verifyChecksum);
   }
 
   @Override

hadoop-ozone/ozone-manager/src/test/java/org/apache/hadoop/ozone/om/TestChunkStreams.java

@@ -47,7 +47,7 @@ public class TestChunkStreams {
       for (int i = 0; i < 5; i++) {
         int tempOffset = offset;
         BlockInputStream in =
-            new BlockInputStream(null, 100, null, null, true, null, null) {
+            new BlockInputStream(null, 100, null, null, true, null) {
               private long pos = 0;
               private ByteArrayInputStream in =
                   new ByteArrayInputStream(buf, tempOffset, 100);
@@ -103,7 +103,7 @@ public class TestChunkStreams {
       for (int i = 0; i < 5; i++) {
         int tempOffset = offset;
         BlockInputStream in =
-            new BlockInputStream(null, 100, null, null, true, null, null) {
+            new BlockInputStream(null, 100, null, null, true, null) {
               private long pos = 0;
               private ByteArrayInputStream in =
                   new ByteArrayInputStream(buf, tempOffset, 100);