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From "dhruba borthakur (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HADOOP-1955) Corrupted block replication retries for ever
Date Wed, 03 Oct 2007 07:19:51 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-1955?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12532019
] 

dhruba borthakur commented on HADOOP-1955:
------------------------------------------

Code looks good. A few minor comments:

1. This test corrupts replicas of a block and checks to see that the Namenode detects this
situation and replicates the remaining good copy. Does it really belong to TestReplication?
Maybe TestCrcCorruption makes more sense.
2. The test waits for 60 seconds for waitForBlockReplication. I vote that we remove this timeout
and make the test wait indefinitely. It might not be a good idea to put adhoc wait periods
in the test. The test framework already enforces a timeout of 10 minutes per test.
3. Why do we need dfs.replication in the conf?

> Corrupted block replication retries for ever
> --------------------------------------------
>
>                 Key: HADOOP-1955
>                 URL: https://issues.apache.org/jira/browse/HADOOP-1955
>             Project: Hadoop
>          Issue Type: Bug
>          Components: dfs
>    Affects Versions: 0.14.1
>            Reporter: Koji Noguchi
>            Assignee: Raghu Angadi
>            Priority: Blocker
>             Fix For: 0.14.2
>
>         Attachments: HADOOP-1955-branch14.patch, HADOOP-1955.patch, HADOOP-1955.patch
>
>
> When replicating corrupted block, receiving side rejects the block due to checksum error.
Namenode keeps on retrying (with the same source datanode).
> Fsck shows those blocks as under-replicated.
> [Namenode log]
> {noformat} 
> 2007-09-27 02:00:05,273 INFO org.apache.hadoop.dfs.StateChange: BLOCK* NameSystem.heartbeatCheck:
lost heartbeat from 99.2.99.111
> ...
> 2007-09-27 02:01:02,618 INFO org.apache.hadoop.dfs.StateChange: BLOCK* NameSystem.pendingTransfer:
ask 99.9.99.11:9999 to replicate blk_-5925066143536023890 to datanode(s) 99.9.99.37:9999
> 2007-09-27 02:10:03,843 WARN org.apache.hadoop.fs.FSNamesystem: PendingReplicationMonitor
timed out block blk_-5925066143536023890
> 2007-09-27 02:10:08,248 INFO org.apache.hadoop.dfs.StateChange: BLOCK* NameSystem.pendingTransfer:
ask 99.9.99.11:9999 to replicate blk_-5925066143536023890 to datanode(s) 99.9.99.35:9999
> 2007-09-27 02:20:03,848 WARN org.apache.hadoop.fs.FSNamesystem: PendingReplicationMonitor
timed out block blk_-5925066143536023890
> 2007-09-27 02:20:08,646 INFO org.apache.hadoop.dfs.StateChange: BLOCK* NameSystem.pendingTransfer:
ask 99.9.99.11:9999 to replicate blk_-5925066143536023890 to datanode(s) 99.9.99.19:9999
> (repeats)
> {noformat} 
> [Datanode(sender) 99.9.99.11 log]
> {noformat} 
> 2007-09-27 02:01:04,493 INFO org.apache.hadoop.dfs.DataNode: Starting thread to transfer
block blk_-5925066143536023890 to [Lorg.apache.hadoop.dfs.DatanodeInfo;@e58187
> 2007-09-27 02:01:05,153 WARN org.apache.hadoop.dfs.DataNode: Failed to transfer blk_-5925066143536023890
to 74.6.128.37:50010 got java.net.SocketException: Connection reset
>   at java.net.SocketOutputStream.socketWrite(SocketOutputStream.java:96)
>   at java.net.SocketOutputStream.write(SocketOutputStream.java:136)
>   at java.io.BufferedOutputStream.flushBuffer(BufferedOutputStream.java:65)
>   at java.io.BufferedOutputStream.write(BufferedOutputStream.java:109)
>   at java.io.DataOutputStream.write(DataOutputStream.java:90)
>   at org.apache.hadoop.dfs.DataNode.sendBlock(DataNode.java:1231)
>   at org.apache.hadoop.dfs.DataNode$DataTransfer.run(DataNode.java:1280)
>   at java.lang.Thread.run(Thread.java:619)
> (repeats)
> {noformat} 
> [Datanode(one of the receiver) 99.9.99.37 log]
> {noformat} 
> 2007-09-27 02:01:05,150 ERROR org.apache.hadoop.dfs.DataNode: DataXceiver: java.io.IOException:
Unexpected checksum mismatch while writing blk_-5925066143536023890 from /74.6.128.33:57605
>   at org.apache.hadoop.dfs.DataNode$DataXceiver.writeBlock(DataNode.java:902)
>   at org.apache.hadoop.dfs.DataNode$DataXceiver.run(DataNode.java:727)
>   at java.lang.Thread.run(Thread.java:619)
> {noformat} 

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