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https://issues.apache.org/jira/browse/HDFS-5177?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13826559#comment-13826559
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Hadoop QA commented on HDFS-5177:
---------------------------------
{color:green}+1 overall{color}. Here are the results of testing the latest
attachment
http://issues.apache.org/jira/secure/attachment/12614577/HDFS-5177.patch
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:green}+1 core tests{color}. The patch passed 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/5482//testReport/
Console output: https://builds.apache.org/job/PreCommit-HDFS-Build/5482//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
>
>
> 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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