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Date: Wed, 20 Jan 2010 00:40:54 +0000 (UTC)
From: "Todd Lipcon (JIRA)" <jira@apache.org>
To: hdfs-issues@hadoop.apache.org
Subject: [jira] Updated: (HDFS-877) Client-driven block verification not
 functioning
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     [ https://issues.apache.org/jira/browse/HDFS-877?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Todd Lipcon updated HDFS-877:
-----------------------------

    Attachment: hdfs-877.txt

reuploading the same patch as before to put it top on the list, so I can toggle Hudson

> Client-driven block verification not functioning
> ------------------------------------------------
>
>                 Key: HDFS-877
>                 URL: https://issues.apache.org/jira/browse/HDFS-877
>             Project: Hadoop HDFS
>          Issue Type: Bug
>          Components: hdfs client, test
>    Affects Versions: 0.20.1, 0.21.0, 0.22.0
>            Reporter: Todd Lipcon
>            Assignee: Todd Lipcon
>            Priority: Blocker
>         Attachments: hdfs-877-branch20.txt, hdfs-877.txt, hdfs-877.txt, hdfs-877.txt, hdfs-877.txt, hdfs-877.txt, hdfs-877.txt
>
>
> This is actually the reason for HDFS-734 (TestDatanodeBlockScanner timing out). The issue is that DFSInputStream relies on readChunk being called one last time at the end of the file in order to receive the lastPacketInBlock=true packet from the DN. However, DFSInputStream.read checks pos < getFileLength() before issuing the read. Thus gotEOS never shifts to true and checksumOk() is never called.

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