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Posted to hdfs-issues@hadoop.apache.org by "Eli Collins (JIRA)" <ji...@apache.org> on 2010/11/19 06:08:15 UTC

[jira] Updated: (HDFS-1001) DataXceiver and BlockReader disagree on when to send/recv CHECKSUM_OK

     [ https://issues.apache.org/jira/browse/HDFS-1001?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Eli Collins updated HDFS-1001:
------------------------------

    Attachment: HDFS-1001-5.patch

Patch attached rebased against trunk.

> 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
>    Affects Versions: 0.22.0
>            Reporter: bc Wong
>            Assignee: bc Wong
>         Attachments: HDFS-1001-2.patch, HDFS-1001-3.patch, HDFS-1001-3.patch, HDFS-1001-4.patch, HDFS-1001-5.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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