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From "Hairong Kuang (JIRA)" <j...@apache.org>
Subject [jira] Updated: (HDFS-673) BlockReceiver#PacketResponder should not remove a packet from the ack queue before its ack is sent
Date Fri, 09 Oct 2009 17:15:31 GMT

     [ https://issues.apache.org/jira/browse/HDFS-673?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Hairong Kuang updated HDFS-673:
-------------------------------

    Status: Patch Available  (was: Open)

The existing tests sometime fail with this error. So I do not think there is a need for new
test. Furthuremore, I have tested this manually too.

> BlockReceiver#PacketResponder should not remove a packet from the ack queue before its
ack is sent
> --------------------------------------------------------------------------------------------------
>
>                 Key: HDFS-673
>                 URL: https://issues.apache.org/jira/browse/HDFS-673
>             Project: Hadoop HDFS
>          Issue Type: Bug
>          Components: data-node
>            Reporter: Hairong Kuang
>            Assignee: Hairong Kuang
>            Priority: Blocker
>             Fix For: 0.21.0
>
>         Attachments: pkgRmOrder.patch
>
>
> After a BlockReceiver finish receiving the last packet of a block, it waits until the
ack queue becomes empty. It them assumes that all acks have been sent and shunts down network
connections. The current code removes a packet from the ack queue before its ack is sent.
So there is a chance that the connection gets closed before an ack is sent.

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