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Posted to hdfs-issues@hadoop.apache.org by "Todd Lipcon (JIRA)" <ji...@apache.org> on 2010/02/25 09:28:28 UTC

[jira] Commented: (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:comment-tabpanel&focusedCommentId=12838242#action_12838242 ] 

Todd Lipcon commented on HDFS-1001:
-----------------------------------

This is a bug on the datanode side, right? The tests from HDFS-877 at least ensure that CHECKSUM_OK works properly where it's supposed to.

> 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
>
> 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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