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https://issues.apache.org/jira/browse/HDFS-1346?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Suresh Srinivas updated HDFS-1346:
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Fix Version/s: 0.20.205.0
+1 for the patch. I committed it to 0.20-security 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, 0.20.205.0
>
> Attachments: HDFS-1346.20-security.1.patch, 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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