[HDFS-6123] Improve datanode error messages

• Type: Improvement
• Status: Closed
• Priority: Minor
• Resolution: Fixed
• Fix Version/s: 2.4.0
• Component/s: datanode
• Hadoop Flags: Reviewed
• Assignee: Tsz-wo Sze
• Reporter: Tsz-wo Sze
• Created: 19/Mar/14 02:58
• Updated: 29/Jul/14 19:01
• Resolved: 19/Mar/14 21:06

Description

yeshavora found two cases that there are unnecessary exception stack trace in datanode log:

• SocketTimeoutException

  2014-03-07 03:30:44,567 INFO datanode.DataNode (BlockSender.java:sendPacket(563)) - exception:
  java.net.SocketTimeoutException: 480000 millis timeout while waiting for channel to be ready for write. ch : java.nio.channels.SocketChannel[connected local=/xx.xx.xx.xx:1019 remote=/xx.xx.xx.xx:37997]
      at org.apache.hadoop.net.SocketIOWithTimeout.doIO(SocketIOWithTimeout.java:164)
      ...
  

• ReplicaAlreadyExistsException

  2014-03-07 03:02:39,334 ERROR datanode.DataNode (DataXceiver.java:run(234)) - xx.xx.xx.xx:1019:DataXceiver error processing WRITE_BLOCK operation src: /xx.xx.xx.xx:32959 dest: /xx.xx.xx.xx:1019
  org.apache.hadoop.hdfs.server.datanode.ReplicaAlreadyExistsException: Block BP-1409640778-xx.xx.xx.xx-1394150965191:blk_1073742158_1334 already exists in state TEMPORARY and thus cannot be created.
      at org.apache.hadoop.hdfs.server.datanode.fsdataset.impl.FsDatasetImpl.createTemporary(FsDatasetImpl.java:874)
      ...
  

Both cases are normal. They are not bugs.

Issue Links

• duplicates: HDFS-721 ERROR Block blk_XXX_1030 already exists in state RBW and thus cannot be created