[ https://issues.apache.org/jira/browse/HDFS-8113?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14501387#comment-14501387 ]
Vinayakumar B commented on HDFS-8113: ------------------------------------- Thanks [~chengbing.liu]. According to code in branch-2.6, genstamp mismatch was the only chance. Now I am clueless :) > NullPointerException in BlockInfoContiguous causes block report failure > ----------------------------------------------------------------------- > > Key: HDFS-8113 > URL: https://issues.apache.org/jira/browse/HDFS-8113 > Project: Hadoop HDFS > Issue Type: Bug > Components: namenode > Affects Versions: 2.6.0 > Reporter: Chengbing Liu > Assignee: Chengbing Liu > Attachments: HDFS-8113.02.patch, HDFS-8113.patch > > > The following copy constructor can throw NullPointerException if {{bc}} is > null. > {code} > protected BlockInfoContiguous(BlockInfoContiguous from) { > this(from, from.bc.getBlockReplication()); > this.bc = from.bc; > } > {code} > We have observed that some DataNodes keeps failing doing block reports with > NameNode. The stacktrace is as follows. Though we are not using the latest > version, the problem still exists. > {quote} > 2015-03-08 19:28:13,442 WARN org.apache.hadoop.hdfs.server.datanode.DataNode: > RemoteException in offerService > org.apache.hadoop.ipc.RemoteException(java.lang.NullPointerException): > java.lang.NullPointerException > at org.apache.hadoop.hdfs.server.blockmanagement.BlockInfo.(BlockInfo.java:80) > at > org.apache.hadoop.hdfs.server.blockmanagement.BlockManager$BlockToMarkCorrupt.(BlockManager.java:1696) > at > org.apache.hadoop.hdfs.server.blockmanagement.BlockManager.checkReplicaCorrupt(BlockManager.java:2185) > at > org.apache.hadoop.hdfs.server.blockmanagement.BlockManager.processReportedBlock(BlockManager.java:2047) > at > org.apache.hadoop.hdfs.server.blockmanagement.BlockManager.reportDiff(BlockManager.java:1950) > at > org.apache.hadoop.hdfs.server.blockmanagement.BlockManager.processReport(BlockManager.java:1823) > at > org.apache.hadoop.hdfs.server.blockmanagement.BlockManager.processReport(BlockManager.java:1750) > at > org.apache.hadoop.hdfs.server.namenode.NameNodeRpcServer.blockReport(NameNodeRpcServer.java:1069) > at > org.apache.hadoop.hdfs.protocolPB.DatanodeProtocolServerSideTranslatorPB.blockReport(DatanodeProtocolServerSideTranslatorPB.java:152) > at > org.apache.hadoop.hdfs.protocol.proto.DatanodeProtocolProtos$DatanodeProtocolService$2.callBlockingMethod(DatanodeProtocolProtos.java:26382) > at > org.apache.hadoop.ipc.ProtobufRpcEngine$Server$ProtoBufRpcInvoker.call(ProtobufRpcEngine.java:587) > at org.apache.hadoop.ipc.RPC$Server.call(RPC.java:1026) > at org.apache.hadoop.ipc.Server$Handler$1.run(Server.java:2013) > at org.apache.hadoop.ipc.Server$Handler$1.run(Server.java:2009) > at java.security.AccessController.doPrivileged(Native Method) > at javax.security.auth.Subject.doAs(Subject.java:415) > at > org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1623) > at org.apache.hadoop.ipc.Server$Handler.run(Server.java:2007) > {quote} -- This message was sent by Atlassian JIRA (v6.3.4#6332)