[jira] [Created] (HDFS-6123) Improve datanode error messages

["Tsz Wo Nicholas Sze (JIRA)" <ji...@apache.org>]

Tsz Wo Nicholas Sze created HDFS-6123:
-----------------------------------------

             Summary: Improve datanode error messages
                 Key: HDFS-6123
                 URL: https://issues.apache.org/jira/browse/HDFS-6123
             Project: Hadoop HDFS
          Issue Type: Improvement
          Components: datanode
            Reporter: Tsz Wo Nicholas Sze
            Assignee: Tsz Wo Nicholas Sze
            Priority: Minor


[~yeshavora] found two cases that there are unnecessary exception stack trace in datanode log:
- SocketTimeoutException
{noformat}
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)
    ...
{noformat}
- ReplicaAlreadyExistsException
{noformat}
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)
    ...
{noformat}

Both cases are normal.  They are not bugs.



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