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From "Hadoop QA (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-6682) Add a metric to expose the timestamp of the oldest under-replicated block
Date Fri, 09 Jan 2015 14:04:34 GMT

    [ https://issues.apache.org/jira/browse/HDFS-6682?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14271039#comment-14271039
] 

Hadoop QA commented on HDFS-6682:
---------------------------------

{color:red}-1 overall{color}.  Here are the results of testing the latest attachment 
  http://issues.apache.org/jira/secure/attachment/12691106/HDFS-6682.002.patch
  against trunk revision ae91b13.

    {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:red}-1 findbugs{color}.  The patch appears to introduce 1 new Findbugs (version
2.0.3) 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-common-project/hadoop-common
hadoop-hdfs-project/hadoop-hdfs.

Test results: https://builds.apache.org/job/PreCommit-HDFS-Build/9164//testReport/
Findbugs warnings: https://builds.apache.org/job/PreCommit-HDFS-Build/9164//artifact/patchprocess/newPatchFindbugsWarningshadoop-hdfs.html
Console output: https://builds.apache.org/job/PreCommit-HDFS-Build/9164//console

This message is automatically generated.

> Add a metric to expose the timestamp of the oldest under-replicated block
> -------------------------------------------------------------------------
>
>                 Key: HDFS-6682
>                 URL: https://issues.apache.org/jira/browse/HDFS-6682
>             Project: Hadoop HDFS
>          Issue Type: Improvement
>            Reporter: Akira AJISAKA
>            Assignee: Akira AJISAKA
>         Attachments: HDFS-6682.002.patch, HDFS-6682.patch
>
>
> In the following case, the data in the HDFS is lost and a client needs to put the same
file again.
> # A Client puts a file to HDFS
> # A DataNode crashes before replicating a block of the file to other DataNodes
> I propose a metric to expose the timestamp of the oldest under-replicated/corrupt block.
That way client can know what file to retain for the re-try.



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