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From "Hairong Kuang (JIRA)" <j...@apache.org>
Subject [jira] Updated: (HADOOP-5009) DataNode#shutdown sometimes leaves data block scanner verification log unclosed
Date Tue, 20 Jan 2009 22:16:59 GMT

     [ https://issues.apache.org/jira/browse/HADOOP-5009?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Hairong Kuang updated HADOOP-5009:
----------------------------------

    Attachment: blockScannerFd1.patch

This patch incorporates Nicholas' comment.

> DataNode#shutdown sometimes leaves data block scanner verification log unclosed
> -------------------------------------------------------------------------------
>
>                 Key: HADOOP-5009
>                 URL: https://issues.apache.org/jira/browse/HADOOP-5009
>             Project: Hadoop Core
>          Issue Type: Bug
>          Components: dfs
>    Affects Versions: 0.17.0
>            Reporter: Hairong Kuang
>            Assignee: Hairong Kuang
>             Fix For: 0.19.1
>
>         Attachments: blockScannerFd.patch, blockScannerFd1.patch
>
>
> When datanode gets shutdown by calling DataNode#shutdown, it occasionally leaves the
data block scanner verification log unclosed. There are two possible causes:
> 1. DataNode does not wait until block scanner thread to exit.
> 2. DataBlockScanner does not guarantee that the verification log is closed if the scanner
is interrupted. 

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