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Posted to common-dev@hadoop.apache.org by "Hairong Kuang (JIRA)" <ji...@apache.org> on 2008/03/27 00:03:24 UTC

[jira] Commented: (HADOOP-3067) DFSInputStream 'pread' does not close its sockets

    [ https://issues.apache.org/jira/browse/HADOOP-3067?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12582470#action_12582470 ] 

Hairong Kuang commented on HADOOP-3067:
---------------------------------------

+1 This patch makes sure that the socket opened in fetchBlockByteRange is closed before the function returns.

> DFSInputStream 'pread' does not close its sockets
> -------------------------------------------------
>
>                 Key: HADOOP-3067
>                 URL: https://issues.apache.org/jira/browse/HADOOP-3067
>             Project: Hadoop Core
>          Issue Type: Bug
>          Components: dfs
>            Reporter: Raghu Angadi
>            Assignee: Raghu Angadi
>            Priority: Blocker
>             Fix For: 0.17.0
>
>         Attachments: HADOOP-3067.patch, HADOOP-3067.patch
>
>
> {{DFSInputStream.read(int, buffer)}} does not close the sockets it opens. Main reason this problem did not show up till now is that pread interface is not used much.
> TestCrcCorruption failure first reported in HADOOP-2902 is caused by this bug. Hadoop 0.17 uses more file descriptors for each thread waiting on socket io. Since client does not close sockets, it leaves a lot of DataNode threads waiting in the unit test.

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