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https://issues.apache.org/jira/browse/HADOOP-3063?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12583379#action_12583379
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Hadoop QA commented on HADOOP-3063:
-----------------------------------
-1 overall. Here are the results of testing the latest attachment
http://issues.apache.org/jira/secure/attachment/12378873/bloommap-v2.patch
against trunk revision 619744.
@author +1. The patch does not contain any @author tags.
tests included +1. The patch appears to include 4 new or modified tests.
javadoc -1. The javadoc tool appears to have generated 1 warning messages.
javac -1. The applied patch generated 579 javac compiler warnings (more
than the trunk's current 568 warnings).
release audit +1. The applied patch does not generate any new release
audit warnings.
findbugs -1. The patch appears to introduce 3 new Findbugs warnings.
core tests +1. The patch passed core unit tests.
contrib tests +1. The patch passed contrib unit tests.
Test results:
http://hudson.zones.apache.org/hudson/job/Hadoop-Patch/2098/testReport/
Findbugs warnings:
http://hudson.zones.apache.org/hudson/job/Hadoop-Patch/2098/artifact/trunk/build/test/findbugs/newPatchFindbugsWarnings.html
Checkstyle results:
http://hudson.zones.apache.org/hudson/job/Hadoop-Patch/2098/artifact/trunk/build/test/checkstyle-errors.html
Console output:
http://hudson.zones.apache.org/hudson/job/Hadoop-Patch/2098/console
This message is automatically generated.
> BloomMapFile - fail-fast version of MapFile for sparsely populated key space
> ----------------------------------------------------------------------------
>
> Key: HADOOP-3063
> URL: https://issues.apache.org/jira/browse/HADOOP-3063
> Project: Hadoop Core
> Issue Type: Improvement
> Components: io
> Affects Versions: 0.17.0
> Reporter: Andrzej Bialecki
> Attachments: bloommap-v2.patch, bloommap.patch
>
>
> The need for this improvement arose when working with large ancillary
> MapFile-s (essentially used as external dictionaries). For each invokation of
> map() / reduce() it was necessary to perform several look-ups in these
> MapFile-s, and in case of sparsely populated key-space the cost of finding
> that a key is absent was too high.
> This patch implements a subclass of MapFile that creates a Bloom filter from
> all keys, so that accurate tests for absence of keys can be performed quickly
> and with 100% accuracy.
> Writer.append() operations update a DynamicBloomFilter, which is then
> serialized when the Writer is closed. This filter is loaded in memory when a
> Reader is created. Reader.get() operation first checks the filter for the key
> membership, and if the key is absent it immediately returns null without
> doing any further IO.
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