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From "stack (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-6448) change BlockReaderLocalLegacy timeout detail
Date Tue, 27 May 2014 03:45:02 GMT

    [ https://issues.apache.org/jira/browse/HDFS-6448?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14009250#comment-14009250

stack commented on HDFS-6448:

[~xieliang007] Makes sense then to leave ping alone (The ping thing I am unclear on myself
-- It is purged from hbase RPC).

Patch lgtm then.  Socket timeout looks more reasonable than the cryptic Client.getTimeout.

You running old-school short-circuit reads (HDFS-2246) then? Do you know if this is is only
an issue in HDFS-2246 SCR?  Is it present in HDFS-347 SCRs?  

Thank [~xieliang007]

> change BlockReaderLocalLegacy timeout detail
> --------------------------------------------
>                 Key: HDFS-6448
>                 URL: https://issues.apache.org/jira/browse/HDFS-6448
>             Project: Hadoop HDFS
>          Issue Type: Improvement
>          Components: hdfs-client
>    Affects Versions: 3.0.0, 2.4.0
>            Reporter: Liang Xie
>            Assignee: Liang Xie
>         Attachments: HDFS-6448.txt
> Our hbase deployed upon hadoop2.0, in one accident, we hit HDFS-5016 in HDFS side, but
we also found from HBase side, the dfs client was hung at getBlockReader, after reading code,
we found there is a timeout setting in current codebase though, but the default hdfsTimeout
value is "-1"  ( from Client.java:getTimeout(conf) )which means no timeout...
> The hung stack trace like following:
> at $Proxy21.getBlockLocalPathInfo(Unknown Source)
> at org.apache.hadoop.hdfs.protocolPB.ClientDatanodeProtocolTranslatorPB.getBlockLocalPathInfo(ClientDatanodeProtocolTranslatorPB.java:215)
> at org.apache.hadoop.hdfs.BlockReaderLocal.getBlockPathInfo(BlockReaderLocal.java:267)
> at org.apache.hadoop.hdfs.BlockReaderLocal.newBlockReader(BlockReaderLocal.java:180)
> at org.apache.hadoop.hdfs.DFSClient.getLocalBlockReader(DFSClient.java:812)
> One feasible fix is replacing the hdfsTimeout with socketTimeout. see attached patch.
Most of credit should give [~liushaohui]

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