[jira] [Commented] (HDFS-5868) Make hsync implementation pluggable

["Hadoop QA (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/HDFS-5868?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13891453#comment-13891453 ] 

Hadoop QA commented on HDFS-5868:
---------------------------------

{color:red}-1 overall{color}.  Here are the results of testing the latest attachment 
  http://issues.apache.org/jira/secure/attachment/12626979/HDFS-5868-branch-2.patch
  against trunk revision .

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

    {color:red}-1 tests included{color}.  The patch doesn't appear to include any new or modified tests.
                        Please justify why no new tests are needed for this patch.
                        Also please list what manual steps were performed to verify this patch.

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

    {color:red}-1 javadoc{color}.  The javadoc tool appears to have generated -14 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:red}-1 release audit{color}.  The applied patch generated 1 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/6026//testReport/
Release audit warnings: https://builds.apache.org/job/PreCommit-HDFS-Build/6026//artifact/trunk/patchprocess/patchReleaseAuditProblems.txt
Console output: https://builds.apache.org/job/PreCommit-HDFS-Build/6026//console

This message is automatically generated.

> Make hsync implementation pluggable
> -----------------------------------
>
>                 Key: HDFS-5868
>                 URL: https://issues.apache.org/jira/browse/HDFS-5868
>             Project: Hadoop HDFS
>          Issue Type: Bug
>          Components: datanode
>    Affects Versions: 2.2.0
>            Reporter: Buddy
>         Attachments: HDFS-5868-branch-2.patch
>
>
> The current implementation of hsync in BlockReceiver only works if the output streams are instances of FileOutputStream. Therefore, there is currently no way for a FSDatasetSpi plugin to implement hsync if it is not using standard OS files.
> One possible solution is to push the implementation of hsync into the ReplicaOutputStreams class. This class is constructed by the ReplicaInPipeline which is constructed by the FSDatasetSpi plugin, therefore it can be extended. Instead of directly calling sync on the output stream, BlockReceiver would call ReplicaOutputStream.sync.  The default implementation of sync in ReplicaOutputStream would be the same as the current implementation in BlockReceiver. 



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