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From "Todd Lipcon (JIRA)" <j...@apache.org>
Subject [jira] Updated: (HDFS-1346) DFSClient receives out of order packet ack
Date Thu, 19 Aug 2010 01:28:18 GMT

     [ https://issues.apache.org/jira/browse/HDFS-1346?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Todd Lipcon updated HDFS-1346:
------------------------------

    Attachment: blockrecv-diff.txt

I'm noticing that the HDFS-101 implementation we've been running with is a bit different than
what made it into the branch-0.20-append, and I don't think susceptible to the issue. Attaching
a diff of our BlockReceiver.java against the branch-20-append one - ignore the bit at the
end with checkDiskError, etc - that's from another patch.

I think the relevent diff chunk here is the first - we detect a HEART_BEAT seqno immediately
and "continue" around the loop in that case. Is this a cleaner fix than the local variable?

> 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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