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Date: Fri, 9 May 2008 05:02:55 -0700 (PDT)
From: "Hadoop QA (JIRA)" <jira@apache.org>
To: core-dev@hadoop.apache.org
Subject: [jira] Commented: (HADOOP-3364) Faster image and log edits loading.
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    [ https://issues.apache.org/jira/browse/HADOOP-3364?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12595574#action_12595574 ] 

Hadoop QA commented on HADOOP-3364:
-----------------------------------

-1 overall.  Here are the results of testing the latest attachment 
  http://issues.apache.org/jira/secure/attachment/12381748/fastLoadImage.patch
  against trunk revision 654315.

    +1 @author.  The patch does not contain any @author tags.

    -1 tests included.  The patch doesn't appear to include any new or modified tests.
                        Please justify why no tests are needed for this patch.

    +1 javadoc.  The javadoc tool did not generate any warning messages.

    +1 javac.  The applied patch does not increase the total number of javac compiler warnings.

    +1 findbugs.  The patch does not introduce any new Findbugs warnings.

    +1 release audit.  The applied patch does not increase the total number of release audit warnings.

    +1 core tests.  The patch passed core unit tests.

    +1 contrib tests.  The patch passed contrib unit tests.

Test results: http://hudson.zones.apache.org/hudson/job/Hadoop-Patch/2438/testReport/
Findbugs warnings: http://hudson.zones.apache.org/hudson/job/Hadoop-Patch/2438/artifact/trunk/build/test/findbugs/newPatchFindbugsWarnings.html
Checkstyle results: http://hudson.zones.apache.org/hudson/job/Hadoop-Patch/2438/artifact/trunk/build/test/checkstyle-errors.html
Console output: http://hudson.zones.apache.org/hudson/job/Hadoop-Patch/2438/console

This message is automatically generated.

> Faster image and log edits loading.
> -----------------------------------
>
>                 Key: HADOOP-3364
>                 URL: https://issues.apache.org/jira/browse/HADOOP-3364
>             Project: Hadoop Core
>          Issue Type: Improvement
>          Components: dfs
>    Affects Versions: 0.18.0
>            Reporter: Konstantin Shvachko
>            Assignee: Konstantin Shvachko
>             Fix For: 0.18.0
>
>         Attachments: fastLoadImage.patch, fastLoadImage.patch
>
>
> This patch optimizes code to provide faster load of fsimage and edits log.
> I implemented ideas mentioned in HADOOP-3022. Namely, removed unnecessary object allocations,
> and implemented optimized loading which avoids unnecessary name-space tree lookups 
> if consecutive files belong to the same parent.
> I changed saveImage algorithm so that it writes first all children of the same directory,
> and then goes inside of its sub-directories. This does not change the format of the image, 
> just changes the order of the stored objects. 
> This should make loading faster after the image is saved with the new version.
> The advantages in performance are
> load/save fsimage: 15-20%
> load edits: 5-10%
> In terms of performance I expected somewhat more from this changes.
> Especially for edits, but it turned out that recent changes substantially slowed down
> edits loading. ADD and CLOSE operations first remove existing file with all its blocks,
> then include at back with potentially new blocks, and then ADD additionally replaces
> just inserted inode by inode-under-construction for the same file.
> This is very inefficient, but hard to fix.
> I'll do it in a separate jira.
> Other changes:
> - I combined most of the UTF8 references in one place at least for FSImage.
> - Included log messages about the startup progress with load/save times and file sizes.
> - Removed pre-crc-upgrade code from FSEdits, which was missed by the crc-remove patch.

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