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Date: Tue, 21 Sep 2010 15:04:36 -0400 (EDT)
From: "Hairong Kuang (JIRA)" <jira@apache.org>
To: hdfs-issues@hadoop.apache.org
Subject: [jira] Commented: (HDFS-1346) DFSClient receives out of order
 packet ack
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    [ https://issues.apache.org/jira/browse/HDFS-1346?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12913180#action_12913180 ] 

Hairong Kuang commented on HDFS-1346:
-------------------------------------

This patch has been deployed on our production cluster for a while and it seems to have fixed the bug. The fix helps reducing the chance of losing data when hflushing.

Shall we commit it to the 0.20 append branch?

> DFSClient receives out of order packet ack
> ------------------------------------------
>
>                 Key: HDFS-1346
>                 URL: https://issues.apache.org/jira/browse/HDFS-1346
>             Project: Hadoop HDFS
>          Issue Type: Bug
>          Components: data-node, hdfs client
>    Affects Versions: 0.20-append
>            Reporter: Hairong Kuang
>            Assignee: Hairong Kuang
>             Fix For: 0.20-append
>
>         Attachments: blockrecv-diff.txt, outOfOrder.patch
>
>
> When running 0.20 patched with HDFS-101, we sometimes see an error as follow:
> WARN hdfs.DFSClient: DFSOutputStream ResponseProcessor exception for block blk_-2871223654872350746_21421120java.io.IOException: Responseprocessor: Expecting seq
> no for block blk_-2871223654872350746_21421120 10280 but received 10281
> at org.apache.hadoop.hdfs.DFSClient$DFSOutputStream$ResponseProcessor.run(DFSClient.java:2570)
> This indicates that DFS client expects an ack for packet N, but receives an ack for packet N+1.

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