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From "Eli Collins (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HDFS-1001) DataXceiver and BlockReader disagree on when to send/recv CHECKSUM_OK
Date Mon, 10 May 2010 21:30:30 GMT

    [ https://issues.apache.org/jira/browse/HDFS-1001?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12865936#action_12865936

Eli Collins commented on HDFS-1001:

bq. Another way to fix this bug is to make the client not send CHECKSUM_OK for partial block
reads. However, that complicates the protocol and makes it unclean. 

Agree the way you currently have it is better.  Latest patch looks good to me.

> 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-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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