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https://issues.apache.org/jira/browse/HBASE-11580?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14344238#comment-14344238
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Hadoop QA commented on HBASE-11580:
-----------------------------------
{color:red}-1 overall{color}. Here are the results of testing the latest
attachment
http://issues.apache.org/jira/secure/attachment/12702007/hbase-11580_v3.patch
against master branch at commit 74e36f8ddd03cf94c17bdb30ecd81cc5dff4d063.
ATTACHMENT ID: 12702007
{color:green}+1 @author{color}. The patch does not contain any @author
tags.
{color:green}+1 tests included{color}. The patch appears to include 23 new
or modified tests.
{color:red}-1 Anti-pattern{color}. The patch appears to
have anti-pattern where BYTES_COMPARATOR was omitted:
+ getRegionInfo(), -1, new TreeMap<byte[], List<Path>>());.
{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:red}-1 javadoc{color}. The javadoc tool appears to have generated 3
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:green}+1 lineLengths{color}. The patch does not introduce lines
longer than 100
{color:green}+1 site{color}. The mvn site goal succeeds with this patch.
{color:green}+1 core tests{color}. The patch passed unit tests in .
Test results:
https://builds.apache.org/job/PreCommit-HBASE-Build/13043//testReport/
Findbugs warnings:
https://builds.apache.org/job/PreCommit-HBASE-Build/13043//artifact/patchprocess/newPatchFindbugsWarningshbase-protocol.html
Findbugs warnings:
https://builds.apache.org/job/PreCommit-HBASE-Build/13043//artifact/patchprocess/newPatchFindbugsWarningshbase-hadoop-compat.html
Findbugs warnings:
https://builds.apache.org/job/PreCommit-HBASE-Build/13043//artifact/patchprocess/newPatchFindbugsWarningshbase-thrift.html
Findbugs warnings:
https://builds.apache.org/job/PreCommit-HBASE-Build/13043//artifact/patchprocess/newPatchFindbugsWarningshbase-server.html
Findbugs warnings:
https://builds.apache.org/job/PreCommit-HBASE-Build/13043//artifact/patchprocess/newPatchFindbugsWarningshbase-common.html
Findbugs warnings:
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Findbugs warnings:
https://builds.apache.org/job/PreCommit-HBASE-Build/13043//artifact/patchprocess/newPatchFindbugsWarningshbase-rest.html
Findbugs warnings:
https://builds.apache.org/job/PreCommit-HBASE-Build/13043//artifact/patchprocess/newPatchFindbugsWarningshbase-examples.html
Findbugs warnings:
https://builds.apache.org/job/PreCommit-HBASE-Build/13043//artifact/patchprocess/newPatchFindbugsWarningshbase-client.html
Findbugs warnings:
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Findbugs warnings:
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Checkstyle Errors:
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Javadoc warnings:
https://builds.apache.org/job/PreCommit-HBASE-Build/13043//artifact/patchprocess/patchJavadocWarnings.txt
Console output:
https://builds.apache.org/job/PreCommit-HBASE-Build/13043//console
This message is automatically generated.
> Failover handling for secondary region replicas
> -----------------------------------------------
>
> Key: HBASE-11580
> URL: https://issues.apache.org/jira/browse/HBASE-11580
> Project: HBase
> Issue Type: Sub-task
> Reporter: Enis Soztutar
> Assignee: Enis Soztutar
> Attachments: hbase-11580_v2.patch, hbase-11580_v3.patch
>
>
> With the async wal approach (HBASE-11568), the edits are not persisted (to
> wal) in the secondary region replicas. However this means that we have to
> deal with secondary region replica failures.
> We can seek to re-replicate the edits from primary to the secondary when the
> secondary region is opened in another server but this would mean to setup a
> replication queue again, and holding on to the wals for longer.
> Instead, we can design it so that the edits form the secondaries are not
> persisted to wal, and if the secondary replica fails over, it will not start
> serving reads until it has guaranteed that it has all the past data.
> For guaranteeing that the secondary replica has all the edits before serving
> reads, we can use flush and region opening markers. Whenever a region open
> event is seen, it writes all the files at the time of opening to wal
> (HBASE-11512). In case of flush, the flushed file is written as well, and the
> secondary replica can do a ls for the store files and pick up all the files
> before the seqId of the flushed file. So, in this design, the secodary
> replica will wait until it sees and replays a flush or region open marker
> from wal from primary. and then start serving. For speeding up replica
> opening time, we can trigger a flush to the primary whenever the secondary
> replica opens as an optimization.
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