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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 Sat, 30 Jan 2010 16:22:34 GMT

    [ https://issues.apache.org/jira/browse/HDFS-927?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12806691#action_12806691
] 

stack commented on HDFS-927:
----------------------------

+1 on commit.  

When I ran:

{code}
$ ANT_HOME=/usr/bin/ant ant -Dfindbugs.home=/Users/stack/bin/findbugs-1.3.9 -Djava5.home=/System/Library/Frameworks/JavaVM.framework/Versions/1.5/Home/
-Dforrest.home=/Users/stack/bin/apache-forrest-0.8 -Dcurl.cmd=/usr/bin/curl -Dpatch.file=/tmp/hdfs-927.txt
test-patch
{code}

on my local machine I got this...

{code}
...
     [exec] There appear to be 114 release audit warnings before the patch and 114 release
audit warnings after applying the patch.
     [exec] 
     [exec] 
     [exec] 
     [exec] 
     [exec] +1 overall.  
     [exec] 
     [exec]     +1 @author.  The patch does not contain any @author tags.
     [exec] 
     [exec]     +1 tests included.  The patch appears to include 8 new or modified tests.
     [exec] 
     [exec]     +1 javadoc.  The javadoc tool did not generate any warning messages.
     [exec] 
     [exec]     +1 javac.  The applied patch does not increase the total number of javac compiler
warnings.
     [exec] 
     [exec]     +1 findbugs.  The patch does not introduce any new Findbugs warnings.
     [exec] 
     [exec]     +1 release audit.  The applied patch does not increase the total number of
release audit warnings.
     [exec] 
     [exec] 
     [exec] 
     [exec] 
     [exec] ======================================================================
     [exec] ======================================================================
     [exec]     Finished build.
     [exec] ======================================================================
     [exec] ======================================================================
     [exec] 
     [exec] 

BUILD SUCCESSFUL
Total time: 12 minutes 47 seconds
{code}

> 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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