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From "Hadoop QA (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-16737) NPE during close of RegionScanner
Date Thu, 06 Oct 2016 14:53:22 GMT

    [ https://issues.apache.org/jira/browse/HBASE-16737?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15552127#comment-15552127
] 

Hadoop QA commented on HBASE-16737:
-----------------------------------

| (x) *{color:red}-1 overall{color}* |
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|| Vote || Subsystem || Runtime || Comment ||
| {color:blue}0{color} | {color:blue} reexec {color} | {color:blue} 0m 14s {color} | {color:blue}
Docker mode activated. {color} |
| {color:green}+1{color} | {color:green} @author {color} | {color:green} 0m 0s {color} | {color:green}
The patch does not contain any @author tags. {color} |
| {color:red}-1{color} | {color:red} test4tests {color} | {color:red} 0m 0s {color} | {color:red}
The patch doesn't appear to include any new or modified tests. Please justify why no new tests
are needed for this patch. Also please list what manual steps were performed to verify this
patch. {color} |
| {color:green}+1{color} | {color:green} mvninstall {color} | {color:green} 3m 7s {color}
| {color:green} master passed {color} |
| {color:green}+1{color} | {color:green} compile {color} | {color:green} 0m 39s {color} |
{color:green} master passed {color} |
| {color:green}+1{color} | {color:green} checkstyle {color} | {color:green} 0m 46s {color}
| {color:green} master passed {color} |
| {color:green}+1{color} | {color:green} mvneclipse {color} | {color:green} 0m 14s {color}
| {color:green} master passed {color} |
| {color:green}+1{color} | {color:green} findbugs {color} | {color:green} 1m 56s {color} |
{color:green} master passed {color} |
| {color:green}+1{color} | {color:green} javadoc {color} | {color:green} 0m 30s {color} |
{color:green} master passed {color} |
| {color:green}+1{color} | {color:green} mvninstall {color} | {color:green} 0m 55s {color}
| {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} compile {color} | {color:green} 0m 42s {color} |
{color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} javac {color} | {color:green} 0m 42s {color} | {color:green}
the patch passed {color} |
| {color:green}+1{color} | {color:green} checkstyle {color} | {color:green} 0m 47s {color}
| {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} mvneclipse {color} | {color:green} 0m 16s {color}
| {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} whitespace {color} | {color:green} 0m 0s {color}
| {color:green} The patch has no whitespace issues. {color} |
| {color:green}+1{color} | {color:green} hadoopcheck {color} | {color:green} 27m 56s {color}
| {color:green} Patch does not cause any errors with Hadoop 2.4.0 2.4.1 2.5.0 2.5.1 2.5.2
2.6.1 2.6.2 2.6.3 2.7.1. {color} |
| {color:green}+1{color} | {color:green} hbaseprotoc {color} | {color:green} 0m 12s {color}
| {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} findbugs {color} | {color:green} 1m 53s {color} |
{color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} javadoc {color} | {color:green} 0m 26s {color} |
{color:green} the patch passed {color} |
| {color:red}-1{color} | {color:red} unit {color} | {color:red} 92m 59s {color} | {color:red}
hbase-server in the patch failed. {color} |
| {color:green}+1{color} | {color:green} asflicense {color} | {color:green} 0m 13s {color}
| {color:green} The patch does not generate ASF License warnings. {color} |
| {color:black}{color} | {color:black} {color} | {color:black} 134m 4s {color} | {color:black}
{color} |
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|| Reason || Tests ||
| Timed out junit tests | org.apache.hadoop.hbase.client.TestFromClientSide |
|   | org.apache.hadoop.hbase.client.TestRestoreSnapshotFromClientWithRegionReplicas |
|   | org.apache.hadoop.hbase.client.TestMobCloneSnapshotFromClient |
|   | org.apache.hadoop.hbase.client.TestHTableMultiplexer |
|   | org.apache.hadoop.hbase.client.TestMobSnapshotCloneIndependence |
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|| Subsystem || Report/Notes ||
| Docker | Client=1.11.2 Server=1.11.2 Image:yetus/hbase:7bda515 |
| JIRA Patch URL | https://issues.apache.org/jira/secure/attachment/12831948/0001-HBASE-16737-Fix-NPE.patch
|
| JIRA Issue | HBASE-16737 |
| Optional Tests |  asflicense  javac  javadoc  unit  findbugs  hadoopcheck  hbaseanti  checkstyle
 compile  |
| uname | Linux c01029d2754c 3.13.0-92-generic #139-Ubuntu SMP Tue Jun 28 20:42:26 UTC 2016
x86_64 x86_64 x86_64 GNU/Linux |
| Build tool | maven |
| Personality | /home/jenkins/jenkins-slave/workspace/PreCommit-HBASE-Build/component/dev-support/hbase-personality.sh
|
| git revision | master / 912ed17 |
| Default Java | 1.8.0_101 |
| findbugs | v3.0.0 |
| unit | https://builds.apache.org/job/PreCommit-HBASE-Build/3857/artifact/patchprocess/patch-unit-hbase-server.txt
|
| unit test logs |  https://builds.apache.org/job/PreCommit-HBASE-Build/3857/artifact/patchprocess/patch-unit-hbase-server.txt
|
|  Test Results | https://builds.apache.org/job/PreCommit-HBASE-Build/3857/testReport/ |
| modules | C: hbase-server U: hbase-server |
| Console output | https://builds.apache.org/job/PreCommit-HBASE-Build/3857/console |
| Powered by | Apache Yetus 0.3.0   http://yetus.apache.org |


This message was automatically generated.



> NPE during close of RegionScanner
> ---------------------------------
>
>                 Key: HBASE-16737
>                 URL: https://issues.apache.org/jira/browse/HBASE-16737
>             Project: HBase
>          Issue Type: Bug
>    Affects Versions: 1.0.3
>            Reporter: Mark Christiaens
>         Attachments: 0001-HBASE-16737-Fix-NPE.patch
>
>
> We encountered the following stack trace during high load:
> {noformat}
> Unexpected throwable object 
> java.lang.NullPointerException
> 	at org.apache.hadoop.hbase.CellComparator.compareRows(CellComparator.java:186)
> 	at org.apache.hadoop.hbase.CellComparator.compare(CellComparator.java:63)
> 	at org.apache.hadoop.hbase.KeyValue$KVComparator.compare(KeyValue.java:2021)
> 	at org.apache.hadoop.hbase.regionserver.KeyValueHeap$KVScannerComparator.compare(KeyValueHeap.java:202)
> 	at org.apache.hadoop.hbase.regionserver.KeyValueHeap$KVScannerComparator.compare(KeyValueHeap.java:178)
> 	at org.apache.hadoop.hbase.regionserver.KeyValueHeap$KVScannerComparator.compare(KeyValueHeap.java:168)
> 	at java.util.PriorityQueue.siftDownUsingComparator(PriorityQueue.java:719)
> 	at java.util.PriorityQueue.siftDown(PriorityQueue.java:687)
> 	at java.util.PriorityQueue.poll(PriorityQueue.java:595)
> 	at org.apache.hadoop.hbase.regionserver.KeyValueHeap.close(KeyValueHeap.java:218)
> 	at org.apache.hadoop.hbase.regionserver.HRegion$RegionScannerImpl.close(HRegion.java:5608)
> 	at org.apache.phoenix.coprocessor.BaseScannerRegionObserver$2.close(BaseScannerRegionObserver.java:279)
> 	at org.apache.phoenix.coprocessor.BaseScannerRegionObserver$1.close(BaseScannerRegionObserver.java:186)
> 	at org.apache.hadoop.hbase.regionserver.RSRpcServices.scan(RSRpcServices.java:2378)
> 	at org.apache.hadoop.hbase.protobuf.generated.ClientProtos$ClientService$2.callBlockingMethod(ClientProtos.java:32205)
> 	at org.apache.hadoop.hbase.ipc.RpcServer.call(RpcServer.java:2034)
> 	at org.apache.hadoop.hbase.ipc.CallRunner.run(CallRunner.java:107)
> 	at org.apache.hadoop.hbase.ipc.RpcExecutor.consumerLoop(RpcExecutor.java:130)
> 	at org.apache.hadoop.hbase.ipc.RpcExecutor$1.run(RpcExecutor.java:107)
> 	at java.lang.Thread.run(Thread.java:745)
> {noformat}
> What I suspect is happening is that the {{RegionScannerImpl}} is being closed while the
scanner's lease is expired.  During this close, the underlying {{KeyValueHeap}} is being polled.
 the {{heap}} tries to read data from {{KeyValueScanners}} that then return {{null}} which
causes the crash.



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