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From "Hadoop QA (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HADOOP-3035) Data nodes should inform the name-node about block crc errors.
Date Wed, 14 May 2008 20:06:55 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-3035?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12596920#action_12596920
] 

Hadoop QA commented on HADOOP-3035:
-----------------------------------

+1 overall.  Here are the results of testing the latest attachment 
  http://issues.apache.org/jira/secure/attachment/12382066/HADOOP-3035-2.patch
  against trunk revision 656270.

    +1 @author.  The patch does not contain any @author tags.

    +1 tests included.  The patch appears to include 7 new or modified tests.

    +1 javadoc.  The javadoc tool did not generate any warning messages.

    +1 javac.  The applied patch does not increase the total number of javac compiler warnings.

    +1 findbugs.  The patch does not introduce any new Findbugs warnings.

    +1 release audit.  The applied patch does not increase the total number of release audit
warnings.

    +1 core tests.  The patch passed core unit tests.

    +1 contrib tests.  The patch passed contrib unit tests.

Test results: http://hudson.zones.apache.org/hudson/job/Hadoop-Patch/2468/testReport/
Findbugs warnings: http://hudson.zones.apache.org/hudson/job/Hadoop-Patch/2468/artifact/trunk/build/test/findbugs/newPatchFindbugsWarnings.html
Checkstyle results: http://hudson.zones.apache.org/hudson/job/Hadoop-Patch/2468/artifact/trunk/build/test/checkstyle-errors.html
Console output: http://hudson.zones.apache.org/hudson/job/Hadoop-Patch/2468/console

This message is automatically generated.

> Data nodes should inform the name-node about block crc errors.
> --------------------------------------------------------------
>
>                 Key: HADOOP-3035
>                 URL: https://issues.apache.org/jira/browse/HADOOP-3035
>             Project: Hadoop Core
>          Issue Type: Bug
>          Components: dfs
>    Affects Versions: 0.16.0
>            Reporter: Konstantin Shvachko
>         Attachments: HADOOP-3035-1.patch, HADOOP-3035-2.patch
>
>
> Currently if a crc error occurs when data-node replicates a block to another node it
throws an exception, and continues.
> {code}
>     [junit] 2008-03-17 19:46:11,855 INFO  dfs.DataNode (DataNode.java:transferBlocks(811))
- 127.0.0.1:3730 Starting thread to transfer block blk_-1962819020391742554 to 127.0.0.1:3740
>     [junit] 2008-03-17 19:46:11,855 INFO  dfs.DataNode (DataNode.java:writeBlock(1067))
- Receiving block blk_-1962819020391742554 src: /127.0.0.1:3791 dest: /127.0.0.1:3740
>     [junit] 2008-03-17 19:46:11,855 INFO  dfs.DataNode (DataNode.java:receiveBlock(2504))
- Exception in receiveBlock for block blk_-1962819020391742554 java.io.IOException: Unexpected
checksum mismatch while writing blk_-1962819020391742554 from /127.0.0.1
>     [junit] 2008-03-17 19:46:11,871 INFO  dfs.DataNode (DataNode.java:run(2626)) - 127.0.0.1:3730:Transmitted
block blk_-1962819020391742554 to /127.0.0.1:3740
>     [junit] 2008-03-17 19:46:11,871 INFO  dfs.DataNode (DataNode.java:writeBlock(1192))
- writeBlock blk_-1962819020391742554 received exception java.io.IOException: Unexpected checksum
mismatch while writing blk_-1962819020391742554 from /127.0.0.1
>     [junit] 2008-03-17 19:46:11,871 ERROR dfs.DataNode (DataNode.java:run(979)) - 127.0.0.1:3740:DataXceiver:
java.io.IOException: Unexpected checksum mismatch while writing blk_-1962819020391742554 from
/127.0.0.1
>     [junit]     at org.apache.hadoop.dfs.DataNode$BlockReceiver.receiveChunk(DataNode.java:2246)
>     [junit]     at org.apache.hadoop.dfs.DataNode$BlockReceiver.receivePacket(DataNode.java:2416)
>     [junit]     at org.apache.hadoop.dfs.DataNode$BlockReceiver.receiveBlock(DataNode.java:2474)
>     [junit]     at org.apache.hadoop.dfs.DataNode$DataXceiver.writeBlock(DataNode.java:1173)
>     [junit]     at org.apache.hadoop.dfs.DataNode$DataXceiver.run(DataNode.java:956)
>     [junit]     at java.lang.Thread.run(Thread.java:595)
> {code}
> The data-node should report the error to the name-node so that the corrupted replica
could be removed and replicated.

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