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From "Eli Collins (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HDFS-1001) DataXceiver and BlockReader disagree on when to send/recv CHECKSUM_OK
Date Fri, 19 Nov 2010 09:09:19 GMT

    [ https://issues.apache.org/jira/browse/HDFS-1001?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12933735#action_12933735
] 

Eli Collins commented on HDFS-1001:
-----------------------------------

Unit test results look the same as trunk before the latest patch.
 
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     [exec]     +1 tests included.  The patch appears to include 9 new or modified tests.
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     [exec]     +1 javadoc.  The javadoc tool did not generate any warning messages.
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     [exec]     +1 javac.  The applied patch does not increase the total number of javac compiler
warnings.
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     [exec]     +1 findbugs.  The patch does not introduce any new Findbugs (version 1.3.9)
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     [exec]     +1 system test framework.  The patch passed system test framework compile.
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> DataXceiver and BlockReader disagree on when to send/recv CHECKSUM_OK
> ---------------------------------------------------------------------
>
>                 Key: HDFS-1001
>                 URL: https://issues.apache.org/jira/browse/HDFS-1001
>             Project: Hadoop HDFS
>          Issue Type: Bug
>          Components: data-node
>            Reporter: bc Wong
>            Assignee: bc Wong
>            Priority: Minor
>             Fix For: 0.23.0
>
>         Attachments: HDFS-1001-2.patch, HDFS-1001-3.patch, HDFS-1001-3.patch, HDFS-1001-4.patch,
HDFS-1001-5.patch, HDFS-1001-6.patch, HDFS-1001-rebased.patch, HDFS-1001.patch, HDFS-1001.patch.1
>
>
> Running the TestPread with additional debug statements reveals that the BlockReader sends
CHECKSUM_OK when the DataXceiver doesn't expect it. Currently it doesn't matter since DataXceiver
closes the connection after each op, and CHECKSUM_OK is the last thing on the wire. But if
we want to cache connections, they need to agree on the exchange of CHECKSUM_OK.

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