HDDS-956. MultipartUpload: List Parts for a Multipart upload key. Contributed by Bharat Viswanadham.

hadoop-hdds/common/src/main/java/org/apache/hadoop/ozone/OzoneConsts.java

@@ -245,6 +245,10 @@ public final class OzoneConsts {
   public static final String REPLICATION_FACTOR = "replicationFactor";
   public static final String KEY_LOCATION_INFO = "keyLocationInfo";
   public static final String MULTIPART_LIST = "multipartList";
+  public static final String UPLOAD_ID = "uploadID";
+  public static final String PART_NUMBER_MARKER = "partNumberMarker";
+  public static final String MAX_PARTS = "maxParts";
+
 
 
   // For OM metrics saving to a file

hadoop-ozone/client/src/main/java/org/apache/hadoop/ozone/client/OzoneBucket.java

@@ -406,6 +406,28 @@ public class OzoneBucket extends WithMetadata {
     proxy.abortMultipartUpload(volumeName, name, keyName, uploadID);
   }
 
+  /**
+   * Returns list of parts of a multipart upload key.
+   * @param keyName
+   * @param uploadID
+   * @param partNumberMarker
+   * @param maxParts
+   * @return OzoneMultipartUploadPartListParts
+   */
+  public OzoneMultipartUploadPartListParts listParts(String keyName,
+      String uploadID, int partNumberMarker, int maxParts)  throws IOException {
+    // As at most we  can have 10000 parts for a key, not using iterator. If
+    // needed, it can be done later. So, if we send 10000 as max parts at
+    // most in a single rpc call, we return 0.6 mb, by assuming each part
+    // size as 60 bytes (ignored the replication type size during calculation)
+
+    return proxy.listParts(volumeName, name, keyName, uploadID,
+              partNumberMarker, maxParts);
+  }
+
+
+
+
   /**
    * An Iterator to iterate over {@link OzoneKey} list.
    */

hadoop-ozone/client/src/main/java/org/apache/hadoop/ozone/client/OzoneMultipartUploadPartListParts.java

@@ -0,0 +1,103 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ *  with the License.  You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ *  Unless required by applicable law or agreed to in writing, software
+ *  distributed under the License is distributed on an "AS IS" BASIS,
+ *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ *  See the License for the specific language governing permissions and
+ *  limitations under the License.
+ */
+
+package org.apache.hadoop.ozone.client;
+
+import org.apache.hadoop.hdds.client.ReplicationType;
+
+import java.util.ArrayList;
+import java.util.List;
+
+/**
+ * Class that represents Multipart upload List parts response.
+ */
+public class OzoneMultipartUploadPartListParts {
+
+  private ReplicationType replicationType;
+  //When a list is truncated, this element specifies the last part in the list,
+  // as well as the value to use for the part-number-marker request parameter
+  // in a subsequent request.
+  private int nextPartNumberMarker;
+  // Indicates whether the returned list of parts is truncated. A true value
+  // indicates that the list was truncated.
+  // A list can be truncated if the number of parts exceeds the limit
+  // returned in the MaxParts element.
+  private boolean truncated;
+  private List<PartInfo> partInfoList = new ArrayList<>();
+
+  public OzoneMultipartUploadPartListParts(ReplicationType type,
+      int nextMarker, boolean truncate) {
+    this.replicationType = type;
+    this.nextPartNumberMarker = nextMarker;
+    this.truncated = truncate;
+  }
+
+  public void addPart(PartInfo partInfo) {
+    this.partInfoList.add(partInfo);
+  }
+
+  public ReplicationType getReplicationType() {
+    return replicationType;
+  }
+
+  public int getNextPartNumberMarker() {
+    return nextPartNumberMarker;
+  }
+
+  public boolean isTruncated() {
+    return truncated;
+  }
+
+  public List<PartInfo> getPartInfoList() {
+    return partInfoList;
+  }
+
+  /**
+   * Class that represents each Part information of a multipart upload part.
+   */
+  public static class PartInfo {
+
+    private int partNumber;
+    private String partName;
+    private long modificationTime;
+    private long size;
+
+    public PartInfo(int number, String name, long time, long size) {
+      this.partNumber = number;
+      this.partName = name;
+      this.modificationTime = time;
+      this.size = size;
+    }
+
+    public int getPartNumber() {
+      return partNumber;
+    }
+
+    public String getPartName() {
+      return partName;
+    }
+
+    public long getModificationTime() {
+      return modificationTime;
+    }
+
+    public long getSize() {
+      return size;
+    }
+  }
+}

hadoop-ozone/client/src/main/java/org/apache/hadoop/ozone/client/protocol/ClientProtocol.java

@@ -454,6 +454,22 @@ public interface ClientProtocol {
   void abortMultipartUpload(String volumeName,
       String bucketName, String keyName, String uploadID) throws IOException;
 
+  /**
+   * Returns list of parts of a multipart upload key.
+   * @param volumeName
+   * @param bucketName
+   * @param keyName
+   * @param uploadID
+   * @param partNumberMarker - returns parts with part number which are greater
+   * than this partNumberMarker.
+   * @param maxParts
+   * @return OmMultipartUploadListParts
+   */
+  OzoneMultipartUploadPartListParts listParts(String volumeName,
+      String bucketName, String keyName, String uploadID, int partNumberMarker,
+      int maxParts)  throws IOException;
+
+
   /**
    * Get a valid Delegation Token.
    *

hadoop-ozone/client/src/main/java/org/apache/hadoop/ozone/client/rest/RestClient.java

@@ -1045,4 +1045,12 @@ public class RestClient implements ClientProtocol {
     throw new UnsupportedOperationException("Ozone REST protocol does not " +
         "support this operation.");
   }
+
+  @Override
+  public OzoneMultipartUploadPartListParts listParts(String volumeName,
+      String bucketName, String keyName, String uploadID, int partNumberMarker,
+      int maxParts)  throws IOException {
+    throw new UnsupportedOperationException("Ozone REST protocol does not " +
+        "support this operation.");
+  }
 }

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

@@ -52,6 +52,8 @@ import org.apache.hadoop.ozone.om.helpers.OmKeyInfo;
 import org.apache.hadoop.ozone.om.helpers.OmMultipartInfo;
 import org.apache.hadoop.ozone.om.helpers.OmMultipartUploadCompleteInfo;
 import org.apache.hadoop.ozone.om.helpers.OmMultipartUploadList;
+import org.apache.hadoop.ozone.om.helpers.OmMultipartUploadListParts;
+import org.apache.hadoop.ozone.om.helpers.OmPartInfo;
 import org.apache.hadoop.ozone.om.helpers.OmVolumeArgs;
 import org.apache.hadoop.ozone.om.helpers.OpenKeySession;
 import org.apache.hadoop.ozone.om.helpers.S3SecretValue;
@@ -778,8 +780,8 @@ public class RpcClient implements ClientProtocol {
       throws IOException {
     HddsClientUtils.verifyResourceName(volumeName, bucketName);
     HddsClientUtils.checkNotNull(keyName, uploadID);
-    Preconditions.checkArgument(partNumber > 0, "Part number should be " +
-        "greater than zero");
+    Preconditions.checkArgument(partNumber > 0 && partNumber <=10000, "Part " +
+        "number should be greater than zero and less than or equal to 10000");
     Preconditions.checkArgument(size >=0, "size should be greater than or " +
         "equal to zero");
     String requestId = UUID.randomUUID().toString();
@@ -858,4 +860,35 @@ public class RpcClient implements ClientProtocol {
     ozoneManagerClient.abortMultipartUpload(omKeyArgs);
   }
 
+  @Override
+  public OzoneMultipartUploadPartListParts listParts(String volumeName,
+      String bucketName, String keyName, String uploadID, int partNumberMarker,
+      int maxParts)  throws IOException {
+    HddsClientUtils.verifyResourceName(volumeName, bucketName);
+    HddsClientUtils.checkNotNull(uploadID);
+    Preconditions.checkArgument(maxParts > 0, "Max Parts Should be greater " +
+        "than zero");
+    Preconditions.checkArgument(partNumberMarker >= 0, "Part Number Marker " +
+        "Should be greater than or equal to zero, as part numbers starts from" +
+        " 1 and ranges till 10000");
+    OmMultipartUploadListParts omMultipartUploadListParts =
+        ozoneManagerClient.listParts(volumeName, bucketName, keyName,
+            uploadID, partNumberMarker, maxParts);
+
+    OzoneMultipartUploadPartListParts ozoneMultipartUploadPartListParts =
+        new OzoneMultipartUploadPartListParts(ReplicationType.valueOf(
+            omMultipartUploadListParts.getReplicationType().toString()),
+            omMultipartUploadListParts.getNextPartNumberMarker(),
+            omMultipartUploadListParts.isTruncated());
+
+    for (OmPartInfo omPartInfo : omMultipartUploadListParts.getPartInfoList()) {
+      ozoneMultipartUploadPartListParts.addPart(
+          new OzoneMultipartUploadPartListParts.PartInfo(
+              omPartInfo.getPartNumber(), omPartInfo.getPartName(),
+              omPartInfo.getModificationTime(), omPartInfo.getSize()));
+    }
+    return ozoneMultipartUploadPartListParts;
+
+  }
+
 }

hadoop-ozone/common/src/main/java/org/apache/hadoop/ozone/OmUtils.java

@@ -155,42 +155,43 @@ public final class OmUtils {
       OzoneManagerProtocolProtos.OMRequest omRequest) {
     OzoneManagerProtocolProtos.Type cmdType = omRequest.getCmdType();
     switch (cmdType) {
-      case CheckVolumeAccess:
-      case InfoVolume:
-      case ListVolume:
-      case InfoBucket:
-      case ListBuckets:
-      case LookupKey:
-      case ListKeys:
-      case InfoS3Bucket:
-      case ListS3Buckets:
-      case ServiceList:
-        return true;
-      case CreateVolume:
-      case SetVolumeProperty:
-      case DeleteVolume:
-      case CreateBucket:
-      case SetBucketProperty:
-      case DeleteBucket:
-      case CreateKey:
-      case RenameKey:
-      case DeleteKey:
-      case CommitKey:
-      case AllocateBlock:
-      case CreateS3Bucket:
-      case DeleteS3Bucket:
-      case InitiateMultiPartUpload:
-      case CommitMultiPartUpload:
-      case CompleteMultiPartUpload:
-      case AbortMultiPartUpload:
-      case GetS3Secret:
-      case GetDelegationToken:
-      case RenewDelegationToken:
-      case CancelDelegationToken:
-        return false;
-      default:
-        LOG.error("CmdType {} is not categorized as readOnly or not.", cmdType);
-        return false;
+    case CheckVolumeAccess:
+    case InfoVolume:
+    case ListVolume:
+    case InfoBucket:
+    case ListBuckets:
+    case LookupKey:
+    case ListKeys:
+    case InfoS3Bucket:
+    case ListS3Buckets:
+    case ServiceList:
+    case ListMultiPartUploadParts:
+      return true;
+    case CreateVolume:
+    case SetVolumeProperty:
+    case DeleteVolume:
+    case CreateBucket:
+    case SetBucketProperty:
+    case DeleteBucket:
+    case CreateKey:
+    case RenameKey:
+    case DeleteKey:
+    case CommitKey:
+    case AllocateBlock:
+    case CreateS3Bucket:
+    case DeleteS3Bucket:
+    case InitiateMultiPartUpload:
+    case CommitMultiPartUpload:
+    case CompleteMultiPartUpload:
+    case AbortMultiPartUpload:
+    case GetS3Secret:
+    case GetDelegationToken:
+    case RenewDelegationToken:
+    case CancelDelegationToken:
+      return false;
+    default:
+      LOG.error("CmdType {} is not categorized as readOnly or not.", cmdType);
+      return false;
     }
   }
 

hadoop-ozone/common/src/main/java/org/apache/hadoop/ozone/audit/OMAction.java

@@ -49,7 +49,8 @@ public enum OMAction implements AuditAction {
   LIST_S3BUCKETS,
   INITIATE_MULTIPART_UPLOAD,
   COMMIT_MULTIPART_UPLOAD_PARTKEY,
-  COMPLETE_MULTIPART_UPLOAD;
+  COMPLETE_MULTIPART_UPLOAD,
+  LIST_MULTIPART_UPLOAD_PARTS;
 
   @Override
   public String getAction() {

hadoop-ozone/common/src/main/java/org/apache/hadoop/ozone/om/exceptions/OMException.java

@@ -130,6 +130,7 @@ public class OMException extends IOException {
     INVALID_TOKEN,
     TOKEN_EXPIRED,
     TOKEN_ERROR_OTHER,
-    UNKNOWN
+    UNKNOWN,
+    LIST_MULTIPART_UPLOAD_PARTS_FAILED;
   }
 }

hadoop-ozone/common/src/main/java/org/apache/hadoop/ozone/om/helpers/OmMultipartKeyInfo.java

@@ -52,7 +52,7 @@ public class OmMultipartKeyInfo {
     return uploadID;
   }
 
-  public TreeMap<Integer, PartKeyInfo> getPartKeyInfoList() {
+  public TreeMap<Integer, PartKeyInfo> getPartKeyInfoMap() {
     return partKeyInfoList;
   }
 

hadoop-ozone/common/src/main/java/org/apache/hadoop/ozone/om/helpers/OmMultipartUploadListParts.java

@@ -0,0 +1,84 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ *  with the License.  You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ *  Unless required by applicable law or agreed to in writing, software
+ *  distributed under the License is distributed on an "AS IS" BASIS,
+ *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ *  See the License for the specific language governing permissions and
+ *  limitations under the License.
+ */
+
+package org.apache.hadoop.ozone.om.helpers;
+
+import org.apache.hadoop.hdds.protocol.proto.HddsProtos;
+import org.apache.hadoop.ozone.protocol.proto.OzoneManagerProtocolProtos
+    .PartInfo;
+
+import java.util.ArrayList;
+import java.util.List;
+
+/**
+ * Class which is response for the list parts of a multipart upload key.
+ */
+public class OmMultipartUploadListParts {
+  private HddsProtos.ReplicationType replicationType;
+  //When a list is truncated, this element specifies the last part in the list,
+  // as well as the value to use for the part-number-marker request parameter
+  // in a subsequent request.
+  private int nextPartNumberMarker;
+ // Indicates whether the returned list of parts is truncated. A true value
+ // indicates that the list was truncated.
+ // A list can be truncated if the number of parts exceeds the limit
+ // returned in the MaxParts element.
+  private boolean truncated;
+  private final List<OmPartInfo> partInfoList = new ArrayList<>();
+
+  public OmMultipartUploadListParts(HddsProtos.ReplicationType type,
+      int nextMarker, boolean truncate) {
+    this.replicationType = type;
+    this.nextPartNumberMarker = nextMarker;
+    this.truncated = truncate;
+  }
+
+  public void addPart(OmPartInfo partInfo) {
+    partInfoList.add(partInfo);
+  }
+
+  public HddsProtos.ReplicationType getReplicationType() {
+    return replicationType;
+  }
+
+  public int getNextPartNumberMarker() {
+    return nextPartNumberMarker;
+  }
+
+  public boolean isTruncated() {
+    return truncated;
+  }
+
+  public void setReplicationType(HddsProtos.ReplicationType replicationType) {
+    this.replicationType = replicationType;
+  }
+
+  public List<OmPartInfo> getPartInfoList() {
+    return partInfoList;
+  }
+
+  public void addPartList(List<OmPartInfo> partInfos) {
+    this.partInfoList.addAll(partInfos);
+  }
+
+  public void addProtoPartList(List<PartInfo> partInfos) {
+    partInfos.forEach(partInfo -> partInfoList.add(new OmPartInfo(
+        partInfo.getPartNumber(), partInfo.getPartName(),
+        partInfo.getModificationTime(), partInfo.getSize())));
+  }
+}

hadoop-ozone/common/src/main/java/org/apache/hadoop/ozone/om/helpers/OmPartInfo.java

@@ -0,0 +1,60 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ *  with the License.  You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ *  Unless required by applicable law or agreed to in writing, software
+ *  distributed under the License is distributed on an "AS IS" BASIS,
+ *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ *  See the License for the specific language governing permissions and
+ *  limitations under the License.
+ */
+
+package org.apache.hadoop.ozone.om.helpers;
+
+import org.apache.hadoop.ozone.protocol.proto.OzoneManagerProtocolProtos.PartInfo;
+
+/**
+ * Class that defines information about each part of a multipart upload key.
+ */
+public class OmPartInfo {
+  private int partNumber;
+  private String partName;
+  private long modificationTime;
+  private long size;
+
+  public OmPartInfo(int number, String name, long time, long size) {
+    this.partNumber = number;
+    this.partName = name;
+    this.modificationTime = time;
+    this.size = size;
+  }
+
+  public int getPartNumber() {
+    return partNumber;
+  }
+
+  public String getPartName() {
+    return partName;
+  }
+
+  public long getModificationTime() {
+    return modificationTime;
+  }
+
+  public long getSize() {
+    return size;
+  }
+
+  public PartInfo getProto() {
+    return PartInfo.newBuilder().setPartNumber(partNumber).setPartName(partName)
+       .setModificationTime(modificationTime)
+       .setSize(size).build();
+  }
+}

hadoop-ozone/common/src/main/java/org/apache/hadoop/ozone/om/protocol/OzoneManagerProtocol.java

@@ -27,6 +27,7 @@ import org.apache.hadoop.ozone.om.helpers.OmKeyInfo;
 import org.apache.hadoop.ozone.om.helpers.OmKeyLocationInfo;
 import org.apache.hadoop.ozone.om.helpers.OmMultipartUploadCompleteInfo;
 import org.apache.hadoop.ozone.om.helpers.OmMultipartUploadList;
+import org.apache.hadoop.ozone.om.helpers.OmMultipartUploadListParts;
 import org.apache.hadoop.ozone.om.helpers.OmVolumeArgs;
 import org.apache.hadoop.ozone.om.helpers.OpenKeySession;
 import org.apache.hadoop.ozone.om.helpers.S3SecretValue;
@@ -350,6 +351,20 @@ public interface OzoneManagerProtocol  extends OzoneManagerSecurityProtocol {
    */
   void abortMultipartUpload(OmKeyArgs omKeyArgs) throws IOException;
 
+  /**
+   * Returns list of parts of a multipart upload key.
+   * @param volumeName
+   * @param bucketName
+   * @param keyName
+   * @param uploadID
+   * @param partNumberMarker
+   * @param maxParts
+   * @return OmMultipartUploadListParts
+   */
+  OmMultipartUploadListParts listParts(String volumeName, String bucketName,
+      String keyName, String uploadID, int partNumberMarker,
+      int maxParts)  throws IOException;
+
   /**
    * Gets s3Secret for given kerberos user.
    * @param kerberosID

hadoop-ozone/common/src/main/java/org/apache/hadoop/ozone/om/protocolPB/OzoneManagerProtocolClientSideTranslatorPB.java

@@ -36,6 +36,7 @@ import org.apache.hadoop.ozone.om.helpers.OmMultipartCommitUploadPartInfo;
 import org.apache.hadoop.ozone.om.helpers.OmMultipartInfo;
 import org.apache.hadoop.ozone.om.helpers.OmMultipartUploadCompleteInfo;
 import org.apache.hadoop.ozone.om.helpers.OmMultipartUploadList;
+import org.apache.hadoop.ozone.om.helpers.OmMultipartUploadListParts;
 import org.apache.hadoop.ozone.om.helpers.OmVolumeArgs;
 import org.apache.hadoop.ozone.om.helpers.OpenKeySession;
 import org.apache.hadoop.ozone.om.helpers.S3SecretValue;
@@ -102,6 +103,10 @@ import org.apache.hadoop.ozone.protocol.proto.OzoneManagerProtocolProtos
     .MultipartUploadCompleteRequest;
 import org.apache.hadoop.ozone.protocol.proto.OzoneManagerProtocolProtos
     .MultipartUploadCompleteResponse;
+import org.apache.hadoop.ozone.protocol.proto.OzoneManagerProtocolProtos
+    .MultipartUploadListPartsRequest;
+import org.apache.hadoop.ozone.protocol.proto.OzoneManagerProtocolProtos
+    .MultipartUploadListPartsResponse;
 import org.apache.hadoop.ozone.protocol.proto
     .OzoneManagerProtocolProtos.RenameKeyRequest;
 import org.apache.hadoop.ozone.protocol.proto
@@ -1143,6 +1148,37 @@ public final class OzoneManagerProtocolClientSideTranslatorPB
 
   }
 
+  @Override
+  public OmMultipartUploadListParts listParts(String volumeName,
+      String bucketName, String keyName, String uploadID,
+      int partNumberMarker, int maxParts) throws IOException {
+    MultipartUploadListPartsRequest.Builder multipartUploadListPartsRequest =
+        MultipartUploadListPartsRequest.newBuilder();
+    multipartUploadListPartsRequest.setVolume(volumeName)
+        .setBucket(bucketName).setKey(keyName).setUploadID(uploadID)
+        .setPartNumbermarker(partNumberMarker).setMaxParts(maxParts);
+
+    OMRequest omRequest = createOMRequest(Type.ListMultiPartUploadParts)
+        .setListMultipartUploadPartsRequest(
+            multipartUploadListPartsRequest.build()).build();
+
+    MultipartUploadListPartsResponse response =
+        submitRequest(omRequest).getListMultipartUploadPartsResponse();
+
+    if (response.getStatus() != Status.OK) {
+      throw new IOException("List Multipart upload parts failed, error: " +
+          response.getStatus());
+    }
+
+    OmMultipartUploadListParts omMultipartUploadListParts =
+        new OmMultipartUploadListParts(response.getType(),
+            response.getNextPartNumberMarker(), response.getIsTruncated());
+    omMultipartUploadListParts.addProtoPartList(response.getPartsListList());
+
+    return omMultipartUploadListParts;
+
+  }
+
   public List<ServiceInfo> getServiceList() throws IOException {
     ServiceListRequest req = ServiceListRequest.newBuilder().build();
 

hadoop-ozone/common/src/main/proto/OzoneManagerProtocol.proto

@@ -69,6 +69,7 @@ enum Type {
   CompleteMultiPartUpload = 47;
   AbortMultiPartUpload = 48;
   GetS3Secret = 49;
+  ListMultiPartUploadParts = 50;
 
   ServiceList = 51;
 
@@ -116,6 +117,7 @@ message OMRequest {
   optional MultipartUploadCompleteRequest   completeMultiPartUploadRequest = 47;
   optional MultipartUploadAbortRequest      abortMultiPartUploadRequest    = 48;
   optional GetS3SecretRequest               getS3SecretRequest             = 49;
+  optional MultipartUploadListPartsRequest  listMultipartUploadPartsRequest = 50;
 
   optional ServiceListRequest               serviceListRequest             = 51;
 
@@ -165,6 +167,7 @@ message OMResponse {
   optional MultipartUploadCompleteResponse completeMultiPartUploadResponse = 47;
   optional MultipartUploadAbortResponse    abortMultiPartUploadResponse    = 48;
   optional GetS3SecretResponse               getS3SecretResponse           = 49;
+  optional MultipartUploadListPartsResponse listMultipartUploadPartsResponse = 50;
 
   optional ServiceListResponse               ServiceListResponse           = 51;
 
@@ -213,6 +216,7 @@ enum Status {
     INVALID_TOKEN = 34;
     TOKEN_EXPIRED = 35;
     TOKEN_ERROR_OTHER = 36;
+    LIST_MULTIPART_UPLOAD_PARTS_FAILED = 37;
 
 }
 
@@ -671,6 +675,30 @@ message MultipartUploadAbortRequest {
 message MultipartUploadAbortResponse {
     required Status status = 1;
 }
+message MultipartUploadListPartsRequest {
+    required string volume = 1;
+    required string bucket = 2;
+    required string key = 3;
+    required string uploadID = 4;
+    optional uint32 partNumbermarker = 5;
+    optional uint32 maxParts = 6;
+}
+
+message MultipartUploadListPartsResponse {
+    required Status status = 1;
+    optional hadoop.hdds.ReplicationType type = 2;
+    optional uint32 nextPartNumberMarker = 3;
+    optional bool isTruncated = 4;
+    repeated PartInfo partsList = 5;
+
+}
+
+message PartInfo {
+    required uint32 partNumber = 1;
+    required string partName = 2;
+    required uint64 modificationTime = 3;
+    required uint64 size = 4;
+}
 
 message GetDelegationTokenResponseProto{
     required Status status = 1;

hadoop-ozone/integration-test/src/test/java/org/apache/hadoop/ozone/client/rpc/TestOzoneRpcClientAbstract.java

@@ -59,6 +59,7 @@ import org.apache.hadoop.ozone.client.OzoneClientFactory;
 import org.apache.hadoop.ozone.client.OzoneKey;
 import org.apache.hadoop.ozone.client.OzoneKeyDetails;
 import org.apache.hadoop.ozone.client.OzoneKeyLocation;
+import org.apache.hadoop.ozone.client.OzoneMultipartUploadPartListParts;
 import org.apache.hadoop.ozone.client.OzoneVolume;
 import org.apache.hadoop.ozone.client.VolumeArgs;
 import org.apache.hadoop.ozone.client.io.KeyOutputStream;
@@ -1758,6 +1759,214 @@ public abstract class TestOzoneRpcClientAbstract {
     }
   }
 
+  @Test
+  public void testListMultipartUploadParts() throws Exception {
+    String volumeName = UUID.randomUUID().toString();
+    String bucketName = UUID.randomUUID().toString();
+    String keyName = UUID.randomUUID().toString();
+
+    store.createVolume(volumeName);
+    OzoneVolume volume = store.getVolume(volumeName);
+    volume.createBucket(bucketName);
+    OzoneBucket bucket = volume.getBucket(bucketName);
+
+    Map<Integer, String> partsMap = new TreeMap<>();
+    String uploadID = initiateMultipartUpload(bucket, keyName, ReplicationType
+        .STAND_ALONE, ReplicationFactor.ONE);
+    String partName1 = uploadPart(bucket, keyName, uploadID, 1,
+        generateData(OzoneConsts.OM_MULTIPART_MIN_SIZE, (byte)97));
+    partsMap.put(1, partName1);
+
+    String partName2 =uploadPart(bucket, keyName, uploadID, 2,
+        generateData(OzoneConsts.OM_MULTIPART_MIN_SIZE, (byte)97));
+    partsMap.put(2, partName2);
+
+    String partName3 =uploadPart(bucket, keyName, uploadID, 3,
+        generateData(OzoneConsts.OM_MULTIPART_MIN_SIZE, (byte)97));
+    partsMap.put(3, partName3);
+
+    OzoneMultipartUploadPartListParts ozoneMultipartUploadPartListParts =
+        bucket.listParts(keyName, uploadID, 0, 3);
+
+    Assert.assertEquals(ReplicationType.STAND_ALONE,
+        ozoneMultipartUploadPartListParts.getReplicationType());
+    Assert.assertEquals(3,
+        ozoneMultipartUploadPartListParts.getPartInfoList().size());
+
+    Assert.assertEquals(partsMap.get(ozoneMultipartUploadPartListParts
+            .getPartInfoList().get(0).getPartNumber()),
+        ozoneMultipartUploadPartListParts.getPartInfoList().get(0)
+            .getPartName());
+    Assert.assertEquals(partsMap.get(ozoneMultipartUploadPartListParts
+            .getPartInfoList().get(1).getPartNumber()),
+        ozoneMultipartUploadPartListParts.getPartInfoList().get(1)
+            .getPartName());
+    Assert.assertEquals(partsMap.get(ozoneMultipartUploadPartListParts
+            .getPartInfoList().get(2).getPartNumber()),
+        ozoneMultipartUploadPartListParts.getPartInfoList().get(2)
+            .getPartName());
+
+    Assert.assertFalse(ozoneMultipartUploadPartListParts.isTruncated());
+  }
+
+  @Test
+  public void testListMultipartUploadPartsWithContinuation()
+      throws Exception {
+    String volumeName = UUID.randomUUID().toString();
+    String bucketName = UUID.randomUUID().toString();
+    String keyName = UUID.randomUUID().toString();
+
+    store.createVolume(volumeName);
+    OzoneVolume volume = store.getVolume(volumeName);
+    volume.createBucket(bucketName);
+    OzoneBucket bucket = volume.getBucket(bucketName);
+
+    Map<Integer, String> partsMap = new TreeMap<>();
+    String uploadID = initiateMultipartUpload(bucket, keyName, ReplicationType
+        .STAND_ALONE, ReplicationFactor.ONE);
+    String partName1 = uploadPart(bucket, keyName, uploadID, 1,
+        generateData(OzoneConsts.OM_MULTIPART_MIN_SIZE, (byte)97));
+    partsMap.put(1, partName1);
+
+    String partName2 =uploadPart(bucket, keyName, uploadID, 2,
+        generateData(OzoneConsts.OM_MULTIPART_MIN_SIZE, (byte)97));
+    partsMap.put(2, partName2);
+
+    String partName3 =uploadPart(bucket, keyName, uploadID, 3,
+        generateData(OzoneConsts.OM_MULTIPART_MIN_SIZE, (byte)97));
+    partsMap.put(3, partName3);
+
+    OzoneMultipartUploadPartListParts ozoneMultipartUploadPartListParts =
+        bucket.listParts(keyName, uploadID, 0, 2);
+
+    Assert.assertEquals(ReplicationType.STAND_ALONE,
+        ozoneMultipartUploadPartListParts.getReplicationType());
+
+    Assert.assertEquals(2,
+        ozoneMultipartUploadPartListParts.getPartInfoList().size());
+
+    Assert.assertEquals(partsMap.get(ozoneMultipartUploadPartListParts
+            .getPartInfoList().get(0).getPartNumber()),
+        ozoneMultipartUploadPartListParts.getPartInfoList().get(0)
+            .getPartName());
+    Assert.assertEquals(partsMap.get(ozoneMultipartUploadPartListParts
+            .getPartInfoList().get(1).getPartNumber()),
+        ozoneMultipartUploadPartListParts.getPartInfoList().get(1)
+            .getPartName());
+
+    // Get remaining
+    Assert.assertTrue(ozoneMultipartUploadPartListParts.isTruncated());
+    ozoneMultipartUploadPartListParts = bucket.listParts(keyName, uploadID,
+        ozoneMultipartUploadPartListParts.getNextPartNumberMarker(), 2);
+
+    Assert.assertEquals(1,
+        ozoneMultipartUploadPartListParts.getPartInfoList().size());
+    Assert.assertEquals(partsMap.get(ozoneMultipartUploadPartListParts
+            .getPartInfoList().get(0).getPartNumber()),
+        ozoneMultipartUploadPartListParts.getPartInfoList().get(0)
+            .getPartName());
+
+
+    // As we don't have any parts for this, we should get false here
+    Assert.assertFalse(ozoneMultipartUploadPartListParts.isTruncated());
+
+  }
+
+  @Test
+  public void testListPartsInvalidPartMarker() throws Exception {
+    try {
+      String volumeName = UUID.randomUUID().toString();
+      String bucketName = UUID.randomUUID().toString();
+      String keyName = UUID.randomUUID().toString();
+
+      store.createVolume(volumeName);
+      OzoneVolume volume = store.getVolume(volumeName);
+      volume.createBucket(bucketName);
+      OzoneBucket bucket = volume.getBucket(bucketName);
+
+
+      OzoneMultipartUploadPartListParts ozoneMultipartUploadPartListParts =
+          bucket.listParts(keyName, "random", -1, 2);
+    } catch (IllegalArgumentException ex) {
+      GenericTestUtils.assertExceptionContains("Should be greater than or " +
+          "equal to zero", ex);
+    }
+  }
+
+  @Test
+  public void testListPartsInvalidMaxParts() throws Exception {
+    try {
+      String volumeName = UUID.randomUUID().toString();
+      String bucketName = UUID.randomUUID().toString();
+      String keyName = UUID.randomUUID().toString();
+
+      store.createVolume(volumeName);
+      OzoneVolume volume = store.getVolume(volumeName);
+      volume.createBucket(bucketName);
+      OzoneBucket bucket = volume.getBucket(bucketName);
+
+
+      OzoneMultipartUploadPartListParts ozoneMultipartUploadPartListParts =
+          bucket.listParts(keyName, "random", 1,  -1);
+    } catch (IllegalArgumentException ex) {
+      GenericTestUtils.assertExceptionContains("Max Parts Should be greater " +
+          "than zero", ex);
+    }
+  }
+
+  @Test
+  public void testListPartsWithPartMarkerGreaterThanPartCount()
+      throws Exception {
+    String volumeName = UUID.randomUUID().toString();
+    String bucketName = UUID.randomUUID().toString();
+    String keyName = UUID.randomUUID().toString();
+
+    store.createVolume(volumeName);
+    OzoneVolume volume = store.getVolume(volumeName);
+    volume.createBucket(bucketName);
+    OzoneBucket bucket = volume.getBucket(bucketName);
+
+
+    String uploadID = initiateMultipartUpload(bucket, keyName, ReplicationType
+        .STAND_ALONE, ReplicationFactor.ONE);
+    uploadPart(bucket, keyName, uploadID, 1,
+        generateData(OzoneConsts.OM_MULTIPART_MIN_SIZE, (byte)97));
+
+
+    OzoneMultipartUploadPartListParts ozoneMultipartUploadPartListParts =
+        bucket.listParts(keyName, uploadID, 100, 2);
+
+    // Should return empty
+
+    Assert.assertEquals(0,
+        ozoneMultipartUploadPartListParts.getPartInfoList().size());
+    Assert.assertEquals(ReplicationType.STAND_ALONE,
+        ozoneMultipartUploadPartListParts.getReplicationType());
+
+    // As we don't have any parts with greater than partNumberMarker and list
+    // is not truncated, so it should return false here.
+    Assert.assertFalse(ozoneMultipartUploadPartListParts.isTruncated());
+
+  }
+
+  @Test
+  public void testListPartsWithInvalidUploadID() throws Exception {
+    try {
+      String volumeName = UUID.randomUUID().toString();
+      String bucketName = UUID.randomUUID().toString();
+      String keyName = UUID.randomUUID().toString();
+
+      store.createVolume(volumeName);
+      OzoneVolume volume = store.getVolume(volumeName);
+      volume.createBucket(bucketName);
+      OzoneBucket bucket = volume.getBucket(bucketName);
+      OzoneMultipartUploadPartListParts ozoneMultipartUploadPartListParts =
+          bucket.listParts(keyName, "random", 100, 2);
+    } catch (IOException ex) {
+      GenericTestUtils.assertExceptionContains("NO_SUCH_MULTIPART_UPLOAD", ex);
+    }
+  }
+
 
   private byte[] generateData(int size, byte val) {
     byte[] chars = new byte[size];

hadoop-ozone/ozone-manager/src/main/java/org/apache/hadoop/ozone/om/KeyManager.java

@@ -25,6 +25,7 @@ import org.apache.hadoop.ozone.om.helpers.OmMultipartCommitUploadPartInfo;
 import org.apache.hadoop.ozone.om.helpers.OmMultipartInfo;
 import org.apache.hadoop.ozone.om.helpers.OmMultipartUploadCompleteInfo;
 import org.apache.hadoop.ozone.om.helpers.OmMultipartUploadList;
+import org.apache.hadoop.ozone.om.helpers.OmMultipartUploadListParts;
 import org.apache.hadoop.ozone.om.helpers.OpenKeySession;
 import org.apache.hadoop.utils.BackgroundService;
 
@@ -220,4 +221,20 @@ public interface KeyManager {
    * @throws IOException
    */
   void abortMultipartUpload(OmKeyArgs omKeyArgs) throws IOException;
+
+
+  /**
+   * Returns list of parts of a multipart upload key.
+   * @param volumeName
+   * @param bucketName
+   * @param keyName
+   * @param uploadID
+   * @param partNumberMarker
+   * @param maxParts
+   * @return OmMultipartUploadListParts
+   */
+  OmMultipartUploadListParts listParts(String volumeName, String bucketName,
+      String keyName, String uploadID, int partNumberMarker,
+      int maxParts)  throws IOException;
+
 }

hadoop-ozone/ozone-manager/src/main/java/org/apache/hadoop/ozone/om/KeyManagerImpl.java

@@ -20,6 +20,7 @@ import java.io.IOException;
 import java.util.ArrayList;
 import java.util.Collections;
 import java.util.EnumSet;
+import java.util.Iterator;
 import java.util.List;
 import java.util.Map;
 import java.util.HashMap;
@@ -31,6 +32,7 @@ import org.apache.commons.codec.digest.DigestUtils;
 import org.apache.hadoop.conf.StorageUnit;
 import org.apache.hadoop.hdds.client.BlockID;
 import org.apache.hadoop.hdds.conf.OzoneConfiguration;
+import org.apache.hadoop.hdds.protocol.proto.HddsProtos;
 import org.apache.hadoop.hdds.protocol.proto.HddsProtos.ReplicationFactor;
 import org.apache.hadoop.hdds.protocol.proto.HddsProtos.ReplicationType;
 import org.apache.hadoop.hdds.scm.container.common.helpers.AllocatedBlock;
@@ -53,6 +55,8 @@ import org.apache.hadoop.ozone.om.helpers.OmMultipartInfo;
 import org.apache.hadoop.ozone.om.helpers.OmMultipartKeyInfo;
 import org.apache.hadoop.ozone.om.helpers.OmMultipartUploadCompleteInfo;
 import org.apache.hadoop.ozone.om.helpers.OmMultipartUploadList;
+import org.apache.hadoop.ozone.om.helpers.OmMultipartUploadListParts;
+import org.apache.hadoop.ozone.om.helpers.OmPartInfo;
 import org.apache.hadoop.ozone.om.helpers.OpenKeySession;
 import org.apache.hadoop.ozone.protocol.proto.OzoneManagerProtocolProtos
     .PartKeyInfo;
@@ -833,7 +837,7 @@ public class KeyManagerImpl implements KeyManager {
             ResultCodes.NO_SUCH_MULTIPART_UPLOAD);
       }
       TreeMap<Integer, PartKeyInfo> partKeyInfoMap = multipartKeyInfo
-          .getPartKeyInfoList();
+          .getPartKeyInfoMap();
 
       TreeMap<Integer, String> multipartMap = multipartUploadList
           .getMultipartMap();
@@ -991,7 +995,7 @@ public class KeyManagerImpl implements KeyManager {
       } else {
         // Move all the parts to delete table
         TreeMap<Integer, PartKeyInfo> partKeyInfoMap = multipartKeyInfo
-            .getPartKeyInfoList();
+            .getPartKeyInfoMap();
         DBStore store = metadataManager.getStore();
         try (BatchOperation batch = store.initBatchOperation()) {
           for (Map.Entry<Integer, PartKeyInfo> partKeyInfoEntry : partKeyInfoMap
@@ -1024,4 +1028,81 @@ public class KeyManagerImpl implements KeyManager {
 
   }
 
+
+  @Override
+  public OmMultipartUploadListParts listParts(String volumeName,
+      String bucketName, String keyName, String uploadID,
+      int partNumberMarker, int maxParts)  throws IOException {
+    Preconditions.checkNotNull(volumeName);
+    Preconditions.checkNotNull(bucketName);
+    Preconditions.checkNotNull(keyName);
+    Preconditions.checkNotNull(uploadID);
+    boolean isTruncated = false;
+    int nextPartNumberMarker = 0;
+
+    metadataManager.getLock().acquireBucketLock(volumeName, bucketName);
+    try {
+      String multipartKey = metadataManager.getMultipartKey(volumeName,
+          bucketName, keyName, uploadID);
+
+      OmMultipartKeyInfo multipartKeyInfo =
+          metadataManager.getMultipartInfoTable().get(multipartKey);
+
+      if (multipartKeyInfo == null) {
+        throw new OMException("No Such Multipart upload exists for this key.",
+                ResultCodes.NO_SUCH_MULTIPART_UPLOAD);
+      } else {
+        TreeMap<Integer, PartKeyInfo> partKeyInfoMap =
+            multipartKeyInfo.getPartKeyInfoMap();
+        Iterator<Map.Entry<Integer, PartKeyInfo>> partKeyInfoMapIterator =
+            partKeyInfoMap.entrySet().iterator();
+        HddsProtos.ReplicationType replicationType =
+            partKeyInfoMap.firstEntry().getValue().getPartKeyInfo().getType();
+        int count = 0;
+        List<OmPartInfo> omPartInfoList = new ArrayList<>();
+
+        while (count < maxParts && partKeyInfoMapIterator.hasNext()) {
+          Map.Entry<Integer, PartKeyInfo> partKeyInfoEntry =
+              partKeyInfoMapIterator.next();
+          nextPartNumberMarker = partKeyInfoEntry.getKey();
+          // As we should return only parts with part number greater
+          // than part number marker
+          if (partKeyInfoEntry.getKey() > partNumberMarker) {
+            PartKeyInfo partKeyInfo = partKeyInfoEntry.getValue();
+            OmPartInfo omPartInfo = new OmPartInfo(partKeyInfo.getPartNumber(),
+                partKeyInfo.getPartName(),
+                partKeyInfo.getPartKeyInfo().getModificationTime(),
+                partKeyInfo.getPartKeyInfo().getDataSize());
+            omPartInfoList.add(omPartInfo);
+            replicationType = partKeyInfo.getPartKeyInfo().getType();
+            count++;
+          }
+        }
+
+        if (partKeyInfoMapIterator.hasNext()) {
+          Map.Entry<Integer, PartKeyInfo> partKeyInfoEntry =
+              partKeyInfoMapIterator.next();
+          isTruncated = true;
+        } else {
+          isTruncated = false;
+          nextPartNumberMarker = 0;
+        }
+        OmMultipartUploadListParts omMultipartUploadListParts =
+            new OmMultipartUploadListParts(replicationType,
+                nextPartNumberMarker, isTruncated);
+        omMultipartUploadListParts.addPartList(omPartInfoList);
+        return omMultipartUploadListParts;
+      }
+    } catch (OMException ex) {
+      throw ex;
+    } catch (IOException ex){
+      LOG.error("List Multipart Upload Parts Failed: volume: " + volumeName +
+              "bucket: " + bucketName + "key: " + keyName, ex);
+      throw new OMException(ex.getMessage(), ResultCodes
+              .LIST_MULTIPART_UPLOAD_PARTS_FAILED);
+    } finally {
+      metadataManager.getLock().releaseBucketLock(volumeName, bucketName);
+    }
+  }
+
 }

hadoop-ozone/ozone-manager/src/main/java/org/apache/hadoop/ozone/om/OMMetrics.java

@@ -92,6 +92,8 @@ public class OMMetrics {
   private @Metric MutableCounterLong numCompleteMultipartUploadFails;
   private @Metric MutableCounterLong numAbortMultipartUploads;
   private @Metric MutableCounterLong numAbortMultipartUploadFails;
+  private @Metric MutableCounterLong numListMultipartUploadParts;
+  private @Metric MutableCounterLong numListMultipartUploadPartFails;
 
   // Metrics for total number of volumes, buckets and keys
 
@@ -269,6 +271,15 @@ public class OMMetrics {
     numAbortMultipartUploadFails.incr();
   }
 
+  public void incNumListMultipartUploadParts() {
+    numKeyOps.incr();
+    numListMultipartUploadParts.incr();
+  }
+
+  public void incNumListMultipartUploadPartFails() {
+    numListMultipartUploadPartFails.incr();
+  }
+
   public void incNumGetServiceLists() {
     numGetServiceLists.incr();
   }

hadoop-ozone/ozone-manager/src/main/java/org/apache/hadoop/ozone/om/OzoneManager.java

@@ -76,6 +76,7 @@ import org.apache.hadoop.ozone.om.helpers.OmMultipartCommitUploadPartInfo;
 import org.apache.hadoop.ozone.om.helpers.OmMultipartInfo;
 import org.apache.hadoop.ozone.om.helpers.OmMultipartUploadCompleteInfo;
 import org.apache.hadoop.ozone.om.helpers.OmMultipartUploadList;
+import org.apache.hadoop.ozone.om.helpers.OmMultipartUploadListParts;
 import org.apache.hadoop.ozone.om.helpers.OmVolumeArgs;
 import org.apache.hadoop.ozone.om.helpers.OpenKeySession;
 import org.apache.hadoop.ozone.om.helpers.ServiceInfo;
@@ -2104,8 +2105,33 @@ public final class OzoneManager extends ServiceRuntimeInfoImpl
 
   }
 
-
-
+  @Override
+  public OmMultipartUploadListParts listParts(String volumeName,
+      String bucketName, String keyName, String uploadID, int partNumberMarker,
+      int maxParts)  throws IOException {
+    Map<String, String> auditMap = new HashMap<>();
+    auditMap.put(OzoneConsts.VOLUME, volumeName);
+    auditMap.put(OzoneConsts.BUCKET, bucketName);
+    auditMap.put(OzoneConsts.KEY, keyName);
+    auditMap.put(OzoneConsts.UPLOAD_ID, uploadID);
+    auditMap.put(OzoneConsts.PART_NUMBER_MARKER,
+        Integer.toString(partNumberMarker));
+    auditMap.put(OzoneConsts.MAX_PARTS, Integer.toString(maxParts));
+    metrics.incNumListMultipartUploadParts();
+    try {
+      OmMultipartUploadListParts omMultipartUploadListParts =
+          keyManager.listParts(volumeName, bucketName, keyName, uploadID,
+              partNumberMarker, maxParts);
+      AUDIT.logWriteSuccess(buildAuditMessageForSuccess(OMAction
+          .LIST_MULTIPART_UPLOAD_PARTS, auditMap));
+      return omMultipartUploadListParts;
+    } catch (IOException ex) {
+      metrics.incNumAbortMultipartUploadFails();
+      AUDIT.logWriteFailure(buildAuditMessageForFailure(OMAction
+          .LIST_MULTIPART_UPLOAD_PARTS, auditMap, ex));
+      throw ex;
+    }
+  }
 
   /**
    * Startup options.

hadoop-ozone/ozone-manager/src/main/java/org/apache/hadoop/ozone/protocolPB/OzoneManagerRequestHandler.java

@@ -19,6 +19,7 @@ package org.apache.hadoop.ozone.protocolPB;
 
 import com.google.common.collect.Lists;
 import java.io.IOException;
+import java.util.ArrayList;
 import java.util.List;
 import java.util.TreeMap;
 import java.util.stream.Collectors;
@@ -35,6 +36,8 @@ import org.apache.hadoop.ozone.om.helpers.OmMultipartCommitUploadPartInfo;
 import org.apache.hadoop.ozone.om.helpers.OmMultipartInfo;
 import org.apache.hadoop.ozone.om.helpers.OmMultipartUploadCompleteInfo;
 import org.apache.hadoop.ozone.om.helpers.OmMultipartUploadList;
+import org.apache.hadoop.ozone.om.helpers.OmMultipartUploadListParts;
+import org.apache.hadoop.ozone.om.helpers.OmPartInfo;
 import org.apache.hadoop.ozone.om.helpers.OmVolumeArgs;
 import org.apache.hadoop.ozone.om.helpers.OpenKeySession;
 import org.apache.hadoop.ozone.om.helpers.ServiceInfo;
@@ -118,6 +121,10 @@ import org.apache.hadoop.ozone.protocol.proto.OzoneManagerProtocolProtos
     .MultipartUploadCompleteRequest;
 import org.apache.hadoop.ozone.protocol.proto.OzoneManagerProtocolProtos
     .MultipartUploadCompleteResponse;
+import org.apache.hadoop.ozone.protocol.proto.OzoneManagerProtocolProtos
+    .MultipartUploadListPartsRequest;
+import org.apache.hadoop.ozone.protocol.proto.OzoneManagerProtocolProtos
+    .MultipartUploadListPartsResponse;
 import org.apache.hadoop.ozone.protocol.proto.OzoneManagerProtocolProtos
     .OMRequest;
 import org.apache.hadoop.ozone.protocol.proto.OzoneManagerProtocolProtos
@@ -325,6 +332,11 @@ public class OzoneManagerRequestHandler {
       responseBuilder.setAbortMultiPartUploadResponse(
           abortMultiPartAbortResponse);
       break;
+    case ListMultiPartUploadParts:
+      MultipartUploadListPartsResponse listPartsResponse =
+          listParts(request.getListMultipartUploadPartsRequest());
+      responseBuilder.setListMultipartUploadPartsResponse(listPartsResponse);
+      break;
     case ServiceList:
       ServiceListResponse serviceListResponse = getServiceList(
           request.getServiceListRequest());
@@ -417,6 +429,8 @@ public class OzoneManagerRequestHandler {
         return Status.ENTITY_TOO_SMALL;
       case ABORT_MULTIPART_UPLOAD_FAILED:
         return Status.ABORT_MULTIPART_UPLOAD_FAILED;
+      case LIST_MULTIPART_UPLOAD_PARTS_FAILED:
+        return Status.LIST_MULTIPART_UPLOAD_PARTS_FAILED;
       case INVALID_AUTH_METHOD:
         return Status.INVALID_AUTH_METHOD;
       case INVALID_TOKEN:
@@ -957,6 +971,44 @@ public class OzoneManagerRequestHandler {
     return response.build();
   }
 
+  private MultipartUploadListPartsResponse listParts(
+      MultipartUploadListPartsRequest multipartUploadListPartsRequest) {
+
+    MultipartUploadListPartsResponse.Builder response =
+        MultipartUploadListPartsResponse.newBuilder();
+
+    try {
+      OmMultipartUploadListParts omMultipartUploadListParts =
+          impl.listParts(multipartUploadListPartsRequest.getVolume(),
+              multipartUploadListPartsRequest.getBucket(),
+              multipartUploadListPartsRequest.getKey(),
+              multipartUploadListPartsRequest.getUploadID(),
+              multipartUploadListPartsRequest.getPartNumbermarker(),
+              multipartUploadListPartsRequest.getMaxParts());
+
+      List<OmPartInfo> omPartInfoList =
+          omMultipartUploadListParts.getPartInfoList();
+
+      List<OzoneManagerProtocolProtos.PartInfo> partInfoList =
+          new ArrayList<>();
+
+      omPartInfoList.forEach(partInfo -> partInfoList.add(partInfo.getProto()));
+
+      response.setType(omMultipartUploadListParts.getReplicationType());
+      response.setNextPartNumberMarker(
+          omMultipartUploadListParts.getNextPartNumberMarker());
+      response.setIsTruncated(omMultipartUploadListParts.isTruncated());
+      response.setStatus(Status.OK);
+      return response.addAllPartsList(partInfoList).build();
+
+    } catch (IOException ex) {
+      response.setStatus(exceptionToResponseStatus(ex));
+    }
+
+    return response.build();
+
+  }
+
   private GetDelegationTokenResponseProto getDelegationToken(
       GetDelegationTokenRequestProto request){
     GetDelegationTokenResponseProto.Builder rb =