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https://issues.apache.org/jira/browse/HBASE-13023?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14322507#comment-14322507
]
Hadoop QA commented on HBASE-13023:
-----------------------------------
{color:red}-1 overall{color}. Here are the results of testing the latest
attachment
http://issues.apache.org/jira/secure/attachment/12699034/HBASE-13023-v1.patch
against master branch at commit 9b2e4ed064e5a832af12616167ce9dee794cdb33.
ATTACHMENT ID: 12699034
{color:green}+1 @author{color}. The patch does not contain any @author
tags.
{color:green}+1 tests included{color}. The patch appears to include 2 new
or modified 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:
+With a single WAL per RegionServer, the RegionServer must write to the WAL
serially, because HDFS files must be sequential. This causes the WAL to be a
performance bottleneck.
+HBase 1.0 introduces support MultiWal in
link:https://issues.apache.org/jira/browse/HBASE-5699[HBASE-5699]. MultiWAL
allows a RegionServer to write multiple WAL streams in parallel, by using
multiple pipelines in the underlying HDFS instance, which increases total
throughput during writes. This parallelization is done by partitioning incoming
edits by their Region. Thus, the current implementation will not help with
increasing the throughput to a single Region.
+RegionServers using the original WAL implementation and those using the
MultiWAL implementation can each handle recovery of either set of WALs, so a
zero-downtime configuration update is possible through a rolling restart.
+To configure MultiWAL for a RegionServer, set the value of the property
`hbase.wal.provider` to `multiwal` by pasting in the following XML:
{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:
{color:red}-1 core zombie tests{color}. There are 1 zombie test(s):
at
org.apache.hadoop.hbase.coprocessor.TestMasterObserver.testRegionTransitionOperations(TestMasterObserver.java:1604)
Test results:
https://builds.apache.org/job/PreCommit-HBASE-Build/12858//testReport/
Findbugs warnings:
https://builds.apache.org/job/PreCommit-HBASE-Build/12858//artifact/patchprocess/newPatchFindbugsWarningshbase-hadoop-compat.html
Findbugs warnings:
https://builds.apache.org/job/PreCommit-HBASE-Build/12858//artifact/patchprocess/newPatchFindbugsWarningshbase-prefix-tree.html
Findbugs warnings:
https://builds.apache.org/job/PreCommit-HBASE-Build/12858//artifact/patchprocess/newPatchFindbugsWarningshbase-examples.html
Findbugs warnings:
https://builds.apache.org/job/PreCommit-HBASE-Build/12858//artifact/patchprocess/newPatchFindbugsWarningshbase-server.html
Findbugs warnings:
https://builds.apache.org/job/PreCommit-HBASE-Build/12858//artifact/patchprocess/newPatchFindbugsWarningshbase-common.html
Findbugs warnings:
https://builds.apache.org/job/PreCommit-HBASE-Build/12858//artifact/patchprocess/newPatchFindbugsWarningshbase-rest.html
Findbugs warnings:
https://builds.apache.org/job/PreCommit-HBASE-Build/12858//artifact/patchprocess/newPatchFindbugsWarningshbase-protocol.html
Findbugs warnings:
https://builds.apache.org/job/PreCommit-HBASE-Build/12858//artifact/patchprocess/newPatchFindbugsWarningshbase-client.html
Findbugs warnings:
https://builds.apache.org/job/PreCommit-HBASE-Build/12858//artifact/patchprocess/newPatchFindbugsWarningshbase-thrift.html
Findbugs warnings:
https://builds.apache.org/job/PreCommit-HBASE-Build/12858//artifact/patchprocess/newPatchFindbugsWarningshbase-hadoop2-compat.html
Findbugs warnings:
https://builds.apache.org/job/PreCommit-HBASE-Build/12858//artifact/patchprocess/newPatchFindbugsWarningshbase-annotations.html
Checkstyle Errors:
https://builds.apache.org/job/PreCommit-HBASE-Build/12858//artifact/patchprocess/checkstyle-aggregate.html
Console output:
https://builds.apache.org/job/PreCommit-HBASE-Build/12858//console
This message is automatically generated.
> Document multiWAL
> -----------------
>
> Key: HBASE-13023
> URL: https://issues.apache.org/jira/browse/HBASE-13023
> Project: HBase
> Issue Type: Bug
> Components: documentation, wal
> Reporter: Misty Stanley-Jones
> Assignee: Misty Stanley-Jones
> Fix For: 2.0.0
>
> Attachments: HBASE-13023-v1.patch, HBASE-13023.patch
>
>
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