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From "Hadoop QA (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-6524) chooseDataNode decides retry times considering with block replica number
Date Fri, 13 Jun 2014 12:56:01 GMT

    [ https://issues.apache.org/jira/browse/HDFS-6524?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14030587#comment-14030587
] 

Hadoop QA commented on HDFS-6524:
---------------------------------

{color:green}+1 overall{color}.  Here are the results of testing the latest attachment 
  http://issues.apache.org/jira/secure/attachment/12650259/HDFS-6524.txt
  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 1 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}.  There were no new javadoc 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/7110//testReport/
Console output: https://builds.apache.org/job/PreCommit-HDFS-Build/7110//console

This message is automatically generated.

> chooseDataNode decides retry times considering with block replica number
> ------------------------------------------------------------------------
>
>                 Key: HDFS-6524
>                 URL: https://issues.apache.org/jira/browse/HDFS-6524
>             Project: Hadoop HDFS
>          Issue Type: Improvement
>          Components: hdfs-client
>    Affects Versions: 3.0.0
>            Reporter: Liang Xie
>            Assignee: Liang Xie
>            Priority: Minor
>         Attachments: HDFS-6524.txt
>
>
> Currently the chooseDataNode() does retry with the setting: dfsClientConf.maxBlockAcquireFailures,
which by default is 3 (DFS_CLIENT_MAX_BLOCK_ACQUIRE_FAILURES_DEFAULT = 3), it would be better
having another option, block replication factor. One cluster with only  two block replica
setting, or using Reed-solomon encoding solution with one replica factor. It helps to reduce
the long tail latency.



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