HDFS-5663 make the retry time and interval value configurable in openInfo()

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-2@1552235 13f79535-47bb-0310-9956-ffa450edef68

hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/DFSClient.java

@@ -277,6 +277,8 @@ public class DFSClient implements java.io.Closeable {
     final boolean getHdfsBlocksMetadataEnabled;
     final int getFileBlockStorageLocationsNumThreads;
     final int getFileBlockStorageLocationsTimeout;
+    final int retryTimesForGetLastBlockLength;
+    final int retryIntervalForGetLastBlockLength;
 
     final boolean useLegacyBlockReader;
     final boolean useLegacyBlockReaderLocal;
@@ -350,6 +352,12 @@ public class DFSClient implements java.io.Closeable {
       getFileBlockStorageLocationsTimeout = conf.getInt(
           DFSConfigKeys.DFS_CLIENT_FILE_BLOCK_STORAGE_LOCATIONS_TIMEOUT,
           DFSConfigKeys.DFS_CLIENT_FILE_BLOCK_STORAGE_LOCATIONS_TIMEOUT_DEFAULT);
+      retryTimesForGetLastBlockLength = conf.getInt(
+          DFSConfigKeys.DFS_CLIENT_RETRY_TIMES_GET_LAST_BLOCK_LENGTH,
+          DFSConfigKeys.DFS_CLIENT_RETRY_TIMES_GET_LAST_BLOCK_LENGTH_DEFAULT);
+      retryIntervalForGetLastBlockLength = conf.getInt(
+        DFSConfigKeys.DFS_CLIENT_RETRY_INTERVAL_GET_LAST_BLOCK_LENGTH,
+        DFSConfigKeys.DFS_CLIENT_RETRY_INTERVAL_GET_LAST_BLOCK_LENGTH_DEFAULT);
 
       useLegacyBlockReader = conf.getBoolean(
           DFSConfigKeys.DFS_CLIENT_USE_LEGACY_BLOCKREADER,

hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/DFSConfigKeys.java

@@ -65,6 +65,10 @@ public class DFSConfigKeys extends CommonConfigurationKeys {
   public static final int     DFS_CLIENT_FILE_BLOCK_STORAGE_LOCATIONS_NUM_THREADS_DEFAULT = 10;
   public static final String  DFS_CLIENT_FILE_BLOCK_STORAGE_LOCATIONS_TIMEOUT = "dfs.client.file-block-storage-locations.timeout";
   public static final int     DFS_CLIENT_FILE_BLOCK_STORAGE_LOCATIONS_TIMEOUT_DEFAULT = 60;
+  public static final String  DFS_CLIENT_RETRY_TIMES_GET_LAST_BLOCK_LENGTH = "dfs.client.retry.times.get-last-block-length";
+  public static final int     DFS_CLIENT_RETRY_TIMES_GET_LAST_BLOCK_LENGTH_DEFAULT = 3;
+  public static final String  DFS_CLIENT_RETRY_INTERVAL_GET_LAST_BLOCK_LENGTH = "dfs.client.retry.interval-ms.get-last-block-length";
+  public static final int     DFS_CLIENT_RETRY_INTERVAL_GET_LAST_BLOCK_LENGTH_DEFAULT = 4000;
 
   // HA related configuration
   public static final String  DFS_CLIENT_FAILOVER_PROXY_PROVIDER_KEY_PREFIX = "dfs.client.failover.proxy.provider";

hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/DFSInputStream.java

@@ -237,7 +237,7 @@ implements ByteBufferReadable, CanSetDropBehind, CanSetReadahead,
    */
   synchronized void openInfo() throws IOException, UnresolvedLinkException {
     lastBlockBeingWrittenLength = fetchLocatedBlocksAndGetLastBlockLength();
-    int retriesForLastBlockLength = 3;
+    int retriesForLastBlockLength = dfsClient.getConf().retryTimesForGetLastBlockLength;
     while (retriesForLastBlockLength > 0) {
       // Getting last block length as -1 is a special case. When cluster
       // restarts, DNs may not report immediately. At this time partial block
@@ -247,7 +247,7 @@ implements ByteBufferReadable, CanSetDropBehind, CanSetReadahead,
         DFSClient.LOG.warn("Last block locations not available. "
             + "Datanodes might not have reported blocks completely."
             + " Will retry for " + retriesForLastBlockLength + " times");
-        waitFor(4000);
+        waitFor(dfsClient.getConf().retryIntervalForGetLastBlockLength);
         lastBlockBeingWrittenLength = fetchLocatedBlocksAndGetLastBlockLength();
       } else {
         break;