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https://issues.apache.org/jira/browse/HBASE-12565?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14234722#comment-14234722
]
Hadoop QA commented on HBASE-12565:
-----------------------------------
{color:red}-1 overall{color}. Here are the results of testing the latest
attachment
http://issues.apache.org/jira/secure/attachment/12685147/hbase-12565.patch
against master branch at commit 04444299ab8bf69618d7e07a6ec7071ce9234d9d.
ATTACHMENT ID: 12685147
{color:green}+1 @author{color}. The patch does not contain any @author
tags.
{color:green}+1 tests included{color}. The patch appears to include 4 new
or modified tests.
{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:red}-1 checkstyle{color}. The applied patch generated
2073 checkstyle errors (more than the master's current 2072 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:
+ * A version of getRowLock(byte[], boolean) to use when a region
operation has already been started
+ private void waitForCounter(MetricsWALSource source, String metricName, long
expectedCount) throws InterruptedException {
+ fail(String.format("Timed out waiting for '%s' >= '%s',
currentCount=%s", metricName, expectedCount, currentCount));
{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.regionserver.TestAtomicOperation.testPutAndCheckAndPutInParallel(TestAtomicOperation.java:556)
Test results:
https://builds.apache.org/job/PreCommit-HBASE-Build/11935//testReport/
Findbugs warnings:
https://builds.apache.org/job/PreCommit-HBASE-Build/11935//artifact/patchprocess/newPatchFindbugsWarningshbase-rest.html
Findbugs warnings:
https://builds.apache.org/job/PreCommit-HBASE-Build/11935//artifact/patchprocess/newPatchFindbugsWarningshbase-common.html
Findbugs warnings:
https://builds.apache.org/job/PreCommit-HBASE-Build/11935//artifact/patchprocess/newPatchFindbugsWarningshbase-client.html
Findbugs warnings:
https://builds.apache.org/job/PreCommit-HBASE-Build/11935//artifact/patchprocess/newPatchFindbugsWarningshbase-annotations.html
Findbugs warnings:
https://builds.apache.org/job/PreCommit-HBASE-Build/11935//artifact/patchprocess/newPatchFindbugsWarningshbase-hadoop-compat.html
Findbugs warnings:
https://builds.apache.org/job/PreCommit-HBASE-Build/11935//artifact/patchprocess/newPatchFindbugsWarningshbase-server.html
Findbugs warnings:
https://builds.apache.org/job/PreCommit-HBASE-Build/11935//artifact/patchprocess/newPatchFindbugsWarningshbase-prefix-tree.html
Findbugs warnings:
https://builds.apache.org/job/PreCommit-HBASE-Build/11935//artifact/patchprocess/newPatchFindbugsWarningshbase-protocol.html
Findbugs warnings:
https://builds.apache.org/job/PreCommit-HBASE-Build/11935//artifact/patchprocess/newPatchFindbugsWarningshbase-thrift.html
Findbugs warnings:
https://builds.apache.org/job/PreCommit-HBASE-Build/11935//artifact/patchprocess/newPatchFindbugsWarningshbase-examples.html
Findbugs warnings:
https://builds.apache.org/job/PreCommit-HBASE-Build/11935//artifact/patchprocess/newPatchFindbugsWarningshbase-hadoop2-compat.html
Checkstyle Errors:
https://builds.apache.org/job/PreCommit-HBASE-Build/11935//artifact/patchprocess/checkstyle-aggregate.html
Console output:
https://builds.apache.org/job/PreCommit-HBASE-Build/11935//console
This message is automatically generated.
> Race condition in HRegion.batchMutate() causes partial data to be written
> when region closes
> ---------------------------------------------------------------------------------------------
>
> Key: HBASE-12565
> URL: https://issues.apache.org/jira/browse/HBASE-12565
> Project: HBase
> Issue Type: Bug
> Components: Performance, regionserver
> Affects Versions: 2.0.0, 0.98.6
> Reporter: Scott Fines
> Attachments: hbase-12565.patch
>
>
> The following sequence of events is possible to occur in HRegion's
> batchMutate() call:
> 1. caller attempts to call HRegion.batchMutate() with a batch of N>1 records
> 2. batchMutate acquires region lock in startRegionOperation, then calls
> doMiniBatchMutation()
> 3. doMiniBatchMutation acquires one row lock
> 4. Region closes
> 5. doMiniBatchMutation attempts to acquire second row lock.
> When this happens, the lock acquisition will also attempt to acquire the
> region lock, which fails (because the region is closing). At this stage,
> doMiniBatchMutation will stop writing further, BUT it WILL write data for the
> rows whose locks have already been acquired, and advance the index in
> MiniBatchOperationInProgress. Then, after it terminates successfully,
> batchMutate() will loop around a second time, and attempt AGAIN to acquire
> the region closing lock. When that happens, a NotServingRegionException is
> thrown back to the caller.
> Thus, we have a race condition where partial data can be written when a
> region server is closing.
> The main problem stems from the location of startRegionOperation() calls in
> batchMutate and doMiniBatchMutation():
> 1. batchMutate() reacquires the region lock with each iteration of the loop,
> which can cause some successful writes to occur, but then fail on others
> 2. getRowLock() attempts to acquire the region lock once for each row, which
> allows doMiniBatchMutation to terminate early; this forces batchMutate() to
> use multiple iterations and results in condition 1 being hit.
> There appears to be two parts to the solution as well:
> 1. open an internal path so that doMiniBatchMutation() can acquire row locks
> without checking for region closure. This will have the added benefit of a
> significant performance improvement during large batch mutations.
> 2. move the startRegionOperation() out of the loop in batchMutate() so that
> multiple iterations of doMiniBatchMutation will not cause the operation to
> fail.
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