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From "Hairong Kuang (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HDFS-668) TestFileAppend3#TC7 sometimes hangs
Date Thu, 15 Oct 2009 23:59:31 GMT

    [ https://issues.apache.org/jira/browse/HDFS-668?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12766335#action_12766335
] 

Hairong Kuang commented on HDFS-668:
------------------------------------

The above proposal turned out to be quite tricky to get it right. So I instead chose to change
only updatePipeline where the old stored block info is removed only from the hashmap in BlocksMap.
After GS etc is updated, put it back into the hashMap. So all other properties of the block
are preserved.

> TestFileAppend3#TC7 sometimes hangs
> -----------------------------------
>
>                 Key: HDFS-668
>                 URL: https://issues.apache.org/jira/browse/HDFS-668
>             Project: Hadoop HDFS
>          Issue Type: Sub-task
>    Affects Versions: 0.21.0
>            Reporter: Hairong Kuang
>             Fix For: 0.21.0
>
>         Attachments: hdfs-668.patch
>
>
> TestFileAppend3 hangs because it fails on close the file. The following is the snippet
of logs that shows the cause of the problem:
>     [junit] 2009-10-01 07:00:00,719 WARN  hdfs.DFSClient (DFSClient.java:setupPipelineForAppendOrRecovery(3004))
- Error Recovery for block blk_-4098350497078465335_1007 in pipeline 127.0.0.1:58375, 127.0.0.1:36982:
bad datanode 127.0.0.1:36982
>     [junit] 2009-10-01 07:00:00,721 INFO  datanode.DataNode (DataXceiver.java:opWriteBlock(224))
- Receiving block blk_-4098350497078465335_1007 src: /127.0.0.1:40252 dest: /127.0.0.1:58375
>     [junit] 2009-10-01 07:00:00,721 INFO  datanode.DataNode (FSDataset.java:recoverClose(1248))
- Recover failed close blk_-4098350497078465335_1007
>     [junit] 2009-10-01 07:00:00,723 INFO  datanode.DataNode (DataXceiver.java:opWriteBlock(369))
- Received block blk_-4098350497078465335_1008 src: /127.0.0.1:40252 dest: /127.0.0.1:58375
of size 65536
>     [junit] 2009-10-01 07:00:00,724 INFO  hdfs.StateChange (BlockManager.java:addStoredBlock(1006))
- BLOCK* NameSystem.addStoredBlock: addStoredBlock request received for blk_-4098350497078465335_1008
on 127.0.0.1:58375 size 65536 But it does not belong to any file.
>     [junit] 2009-10-01 07:00:00,724 INFO  namenode.FSNamesystem (FSNamesystem.java:updatePipeline(3946))
- updatePipeline(block=blk_-4098350497078465335_1007, newGenerationStamp=1008, newLength=65536,
newNodes=[127.0.0.1:58375], clientName=DFSClient_995688145)
>  

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