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https://issues.apache.org/jira/browse/HBASE-13052?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14323601#comment-14323601
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Hadoop QA commented on HBASE-13052:
-----------------------------------
{color:red}-1 overall{color}. Here are the results of testing the latest
attachment
http://issues.apache.org/jira/secure/attachment/12699183/HBASE-13052.patch
against master branch at commit e99091e97c374a026ba690cf9d6a4592f3c3fbdd.
ATTACHMENT ID: 12699183
{color:green}+1 @author{color}. The patch does not contain any @author
tags.
{color:green}+0 tests included{color}. The patch appears to be a
documentation patch that doesn't require tests.
{color:green}+1 hadoop versions{color}. The patch compiles with all
supported hadoop versions (2.4.1 2.5.2 2.6.0)
{color:green}+1 javac{color}. The applied patch does not increase the
total number of javac compiler warnings.
{color:green}+1 javac{color}. The applied patch does not increase the
total number of javac compiler warnings.
{color:green}+1 javadoc{color}. The javadoc tool did not generate any
warning messages.
{color:green}+1 checkstyle{color}. The applied patch does not increase the
total number of checkstyle errors
{color:green}+1 findbugs{color}. The patch does not introduce any new
Findbugs (version 2.0.3) warnings.
{color:green}+1 release audit{color}. The applied patch does not increase
the total number of release audit warnings.
{color:red}-1 lineLengths{color}. The patch introduces the following lines
longer than 100:
+HBase includes five different region split policies. In addition, you can
create your own split policy. See <<region.split.policies.custom>>. To
configure a split policy globally or for a given table, see
<<region.split.policy.configure>>.
+*
link:http://hbase.apache.org/devapidocs/org/apache/hadoop/hbase/regionserver/IncreasingToUpperBoundRegionSplitPolicy.html[IncreasingToUpperBoundRegionSplitPolicy]
-- the default split policy since HBase 0.94. Split regions based upon the
size of the store files, but split more aggressively depending on the number of
regions of the same table hosted on a given RegionServer.
+*
link:http://hbase.apache.org/devapidocs/org/apache/hadoop/hbase/regionserver/KeyPrefixRegionSplitPolicy.html[KeyPrefixRegionSplitPolicy]
-- Extends
link:http://hbase.apache.org/devapidocs/org/apache/hadoop/hbase/regionserver/IncreasingToUpperBoundRegionSplitPolicy.html[IncreasingToUpperBoundRegionSplitPolicy].
You can determine a given prefix length, and rows that share the same prefix
up to that length are always kept together.
+*
link:http://hbase.apache.org/devapidocs/org/apache/hadoop/hbase/regionserver/DelimitedKeyPrefixRegionSplitPolicy.html[DelimitedKeyPrefixRegionSplitPolicy]
-- Extends
link:http://hbase.apache.org/devapidocs/org/apache/hadoop/hbase/regionserver/IncreasingToUpperBoundRegionSplitPolicy.html[IncreasingToUpperBoundRegionSplitPolicy].
If your row-keys are delimited, for instance, with underscores as in
`userid_eventtype_eventid`, this split policy ensures that all rows starting
with the same `userid` are grouped together during splits.
+*
link:http://hbase.apache.org/devapidocs/org/apache/hadoop/hbase/regionserver/ConstantSizeRegionSplitPolicy.html[ConstantSizeRegionSplitPolicy]
-- the default split policy in HBase 0.94 and earlier. Split regions based
only upon the size of the store file.
+*
link:http://hbase.apache.org/devapidocs/org/apache/hadoop/hbase/regionserver/DisabledRegionSplitPolicy.html[DisabledRegionSplitPolicy]
-- disable splitting for this table. Not recommended!
+* Do your needs fall outside the scope of any of the existing region split
policies? In this case, consider implementing a
<<region.split.policies.custom,custom split policy>>.
{color:green}+1 site{color}. The mvn site goal succeeds with this patch.
{color:red}-1 core tests{color}. The patch failed these unit tests:
Test results:
https://builds.apache.org/job/PreCommit-HBASE-Build/12872//testReport/
Findbugs warnings:
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Console output:
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This message is automatically generated.
> Explain each region split policy
> --------------------------------
>
> Key: HBASE-13052
> URL: https://issues.apache.org/jira/browse/HBASE-13052
> Project: HBase
> Issue Type: Bug
> Components: documentation
> Reporter: Misty Stanley-Jones
> Assignee: Misty Stanley-Jones
> Attachments: HBASE-13052.patch
>
>
> {quote}
> there are five region split policies today so that let's add a section which
> explains:
> 1. How each policies work. We can start from current java doc:
> http://hbase.apache.org/devapidocs/org/apache/hadoop/hbase/regionserver/KeyPrefixRegionSplitPolicy.html
> http://hbase.apache.org/devapidocs/org/apache/hadoop/hbase/regionserver/DelimitedKeyPrefixRegionSplitPolicy.html
> http://hbase.apache.org/devapidocs/org/apache/hadoop/hbase/regionserver/DisabledRegionSplitPolicy.html
> http://hbase.apache.org/devapidocs/org/apache/hadoop/hbase/regionserver/ConstantSizeRegionSplitPolicy.html
> http://hbase.apache.org/devapidocs/org/apache/hadoop/hbase/regionserver/IncreasingToUpperBoundRegionSplitPolicy.html
> 2. How users can choose a good policy per their scenario basis
> 3. Pros and cons over each policies
> {quote}
> from [~daisuke.kobayashi]
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