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From "stack (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HDFS-927) DFSInputStream retries too many times for new block locations
Date Tue, 02 Feb 2010 01:36:18 GMT

    [ https://issues.apache.org/jira/browse/HDFS-927?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12828391#action_12828391
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stack commented on HDFS-927:
----------------------------

.bq This would only be the case if you spanned all three blocks with a single read() op. Not
likely to happen unless you're calling read() once with a 200MB buffer or something 

Yeah, I was just thinking this while out on an errand.  My conjecture is way too contrived.

So, @Tsz, extra +1 on the Todd patch.

> DFSInputStream retries too many times for new block locations
> -------------------------------------------------------------
>
>                 Key: HDFS-927
>                 URL: https://issues.apache.org/jira/browse/HDFS-927
>             Project: Hadoop HDFS
>          Issue Type: Bug
>          Components: hdfs client
>    Affects Versions: 0.21.0, 0.22.0
>            Reporter: Todd Lipcon
>            Assignee: Todd Lipcon
>            Priority: Critical
>         Attachments: hdfs-927.txt
>
>
> I think this is a regression caused by HDFS-127 -- DFSInputStream is supposed to only
go back to the NN max.block.acquires times, but in trunk it goes back twice as many - the
default is 3, but I am counting 7 calls to getBlockLocations before an exception is thrown.

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