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From "Hadoop QA (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-5868) Make hsync implementation pluggable
Date Wed, 19 Feb 2014 23:34:24 GMT

    [ https://issues.apache.org/jira/browse/HDFS-5868?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13906281#comment-13906281

Hadoop QA commented on HDFS-5868:

{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:red}-1 tests included{color}.  The patch doesn't appear to include any new or modified
                        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: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: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/6179//testReport/
Console output: https://builds.apache.org/job/PreCommit-HDFS-Build/6179//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: Sub-task
>          Components: datanode
>    Affects Versions: 2.2.0
>            Reporter: Buddy
>         Attachments: HDFS-5868-branch-2.patch, HDFS-5868a-branch-2.patch, HDFS-5868b-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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