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Posted to common-dev@hadoop.apache.org by "Hadoop QA (JIRA)" <ji...@apache.org> on 2008/05/08 22:04:57 UTC
[jira] Commented: (HADOOP-3364) Faster image and log edits loading.
[ https://issues.apache.org/jira/browse/HADOOP-3364?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12595375#action_12595375 ]
Hadoop QA commented on HADOOP-3364:
-----------------------------------
-1 overall. Here are the results of testing the latest attachment
http://issues.apache.org/jira/secure/attachment/12381648/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 appears to introduce 1 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/2426/testReport/
Findbugs warnings: http://hudson.zones.apache.org/hudson/job/Hadoop-Patch/2426/artifact/trunk/build/test/findbugs/newPatchFindbugsWarnings.html
Checkstyle results: http://hudson.zones.apache.org/hudson/job/Hadoop-Patch/2426/artifact/trunk/build/test/checkstyle-errors.html
Console output: http://hudson.zones.apache.org/hudson/job/Hadoop-Patch/2426/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
>
>
> 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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