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From "Hadoop QA (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-5177) blocksScheduled count should be decremented for abandoned blocks
Date Fri, 29 Nov 2013 04:08:35 GMT

    [ https://issues.apache.org/jira/browse/HDFS-5177?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13835171#comment-13835171

Hadoop QA commented on HDFS-5177:

{color:red}-1 overall{color}.  Here are the results of testing the latest attachment 
  against trunk revision .

    {color:green}+1 @author{color}.  The patch does not contain any @author tags.

    {color:green}+1 tests included{color}.  The patch appears to include 3 new or modified
test files.

    {color:green}+1 javac{color}.  The applied patch does not increase the total number of
javac compiler warnings.

    {color:green}+1 javadoc{color}.  The javadoc tool did not generate any warning messages.

    {color:green}+1 eclipse:eclipse{color}.  The patch built with eclipse:eclipse.

    {color:green}+1 findbugs{color}.  The patch does not introduce any new Findbugs (version
1.3.9) warnings.

    {color:green}+1 release audit{color}.  The applied patch does not increase the total number
of release audit warnings.

    {color:red}-1 core tests{color}.  The patch failed these unit tests in hadoop-hdfs-project/hadoop-hdfs:


    {color:green}+1 contrib tests{color}.  The patch passed contrib unit tests.

Test results: https://builds.apache.org/job/PreCommit-HDFS-Build/5602//testReport/
Console output: https://builds.apache.org/job/PreCommit-HDFS-Build/5602//console

This message is automatically generated.

> blocksScheduled  count should be decremented for abandoned blocks
> -----------------------------------------------------------------
>                 Key: HDFS-5177
>                 URL: https://issues.apache.org/jira/browse/HDFS-5177
>             Project: Hadoop HDFS
>          Issue Type: Bug
>          Components: namenode
>    Affects Versions: 3.0.0, 2.1.0-beta
>            Reporter: Vinay
>            Assignee: Vinay
>         Attachments: HDFS-5177.patch, HDFS-5177.patch, HDFS-5177.patch
> DatanodeDescriptor#incBlocksScheduled() will be called for all datanodes of the block
on each allocation. But same should be decremented for abandoned blocks.
> When one of the datanodes is down and same is allocated for the block along with other
live datanodes, then this block will be abandoned, but the scheduled count on other datanodes
will consider live datanodes as loaded, but in reality these datanodes may not be loaded.
> Anyway this scheduled count will be rolled every 20 mins.
> Problem will come if the rate of creation of files is more. Due to increase in the scheduled
count, there might be chances of missing local datanode to write to. and some times writes
also can fail in small clusters.
> So we need to decrement the unnecessary count on abandon block call.

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