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https://issues.apache.org/jira/browse/HADOOP-5369?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12709162#action_12709162
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Hadoop QA commented on HADOOP-5369:
-----------------------------------
-1 overall. Here are the results of testing the latest attachment
http://issues.apache.org/jira/secure/attachment/12407970/smaller_mapfile.patch
against trunk revision 774433.
+1 @author. The patch does not contain any @author tags.
+1 tests included. The patch appears to include 3 new or modified tests.
+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 Eclipse classpath. The patch retains Eclipse classpath integrity.
+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 failed contrib unit tests.
Test results:
http://hudson.zones.apache.org/hudson/job/Hadoop-Patch-vesta.apache.org/334/testReport/
Findbugs warnings:
http://hudson.zones.apache.org/hudson/job/Hadoop-Patch-vesta.apache.org/334/artifact/trunk/build/test/findbugs/newPatchFindbugsWarnings.html
Checkstyle results:
http://hudson.zones.apache.org/hudson/job/Hadoop-Patch-vesta.apache.org/334/artifact/trunk/build/test/checkstyle-errors.html
Console output:
http://hudson.zones.apache.org/hudson/job/Hadoop-Patch-vesta.apache.org/334/console
This message is automatically generated.
> Small tweaks to reduce MapFile index size
> -----------------------------------------
>
> Key: HADOOP-5369
> URL: https://issues.apache.org/jira/browse/HADOOP-5369
> Project: Hadoop Core
> Issue Type: Improvement
> Reporter: Ben Maurer
> Assignee: Ben Maurer
> Fix For: 0.21.0
>
> Attachments: mapfile.patch, smaller_mapfile.patch,
> smaller_mapfile.patch, smaller_mapfile.patch, smaller_mapfile.patch,
> smaller_mapfile.patch
>
>
> Two minor tweaks can help reduce the memory overhead of the MapFile index a
> bit:
> 1) Because the index file is a sequence file, it's length is not known. That
> means the index is built using the standard "mulitply the size of the buffer
> on overflow" with a factor of 3/2. With small keys, the slack in the index
> can be substantial. This patch has a constant upper bound on the amount of
> slack allowed.
> 2) In block compressed map files the index file often has entries with the
> same offset (because the compressed block had more than index interval keys).
> The entries with identical offsets do not help MapFile do random access any
> faster. This patch eliminates these types of entries from new map files, and
> ignores them while reading old map files. This patch greatly helped with
> memory usage on a compressed hbase table.
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