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https://issues.apache.org/jira/browse/HBASE-18221?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16054628#comment-16054628
 ] 

Hadoop QA commented on HBASE-18221:
-----------------------------------

| (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 21s 
{color} | {color:blue} Docker mode activated. {color} |
| {color:green}+1{color} | {color:green} hbaseanti {color} | {color:green} 0m 
0s {color} | {color:green} Patch does not have any anti-patterns. {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:green}+1{color} | {color:green} test4tests {color} | {color:green} 0m 
0s {color} | {color:green} The patch appears to include 1 new or modified test 
files. {color} |
| {color:green}+1{color} | {color:green} mvninstall {color} | {color:green} 3m 
51s {color} | {color:green} master passed {color} |
| {color:green}+1{color} | {color:green} compile {color} | {color:green} 0m 43s 
{color} | {color:green} master passed {color} |
| {color:green}+1{color} | {color:green} checkstyle {color} | {color:green} 0m 
53s {color} | {color:green} master passed {color} |
| {color:green}+1{color} | {color:green} mvneclipse {color} | {color:green} 0m 
15s {color} | {color:green} master passed {color} |
| {color:green}+1{color} | {color:green} findbugs {color} | {color:green} 2m 8s 
{color} | {color:green} master passed {color} |
| {color:green}+1{color} | {color:green} javadoc {color} | {color:green} 0m 33s 
{color} | {color:green} master passed {color} |
| {color:red}-1{color} | {color:red} mvninstall {color} | {color:red} 0m 29s 
{color} | {color:red} hbase-server in the patch failed. {color} |
| {color:red}-1{color} | {color:red} compile {color} | {color:red} 0m 30s 
{color} | {color:red} hbase-server in the patch failed. {color} |
| {color:red}-1{color} | {color:red} javac {color} | {color:red} 0m 30s {color} 
| {color:red} hbase-server in the patch failed. {color} |
| {color:green}+1{color} | {color:green} checkstyle {color} | {color:green} 0m 
51s {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:red}-1{color} | {color:red} whitespace {color} | {color:red} 0m 0s 
{color} | {color:red} The patch has 2 line(s) that end in whitespace. Use git 
apply --whitespace=fix. {color} |
| {color:red}-1{color} | {color:red} hadoopcheck {color} | {color:red} 1m 23s 
{color} | {color:red} The patch causes 14 errors with Hadoop v2.6.1. {color} |
| {color:red}-1{color} | {color:red} hadoopcheck {color} | {color:red} 2m 44s 
{color} | {color:red} The patch causes 14 errors with Hadoop v2.6.2. {color} |
| {color:red}-1{color} | {color:red} hadoopcheck {color} | {color:red} 4m 7s 
{color} | {color:red} The patch causes 14 errors with Hadoop v2.6.3. {color} |
| {color:red}-1{color} | {color:red} hadoopcheck {color} | {color:red} 5m 25s 
{color} | {color:red} The patch causes 14 errors with Hadoop v2.6.4. {color} |
| {color:red}-1{color} | {color:red} hadoopcheck {color} | {color:red} 6m 44s 
{color} | {color:red} The patch causes 14 errors with Hadoop v2.6.5. {color} |
| {color:red}-1{color} | {color:red} hadoopcheck {color} | {color:red} 8m 3s 
{color} | {color:red} The patch causes 14 errors with Hadoop v2.7.1. {color} |
| {color:red}-1{color} | {color:red} hadoopcheck {color} | {color:red} 9m 27s 
{color} | {color:red} The patch causes 14 errors with Hadoop v2.7.2. {color} |
| {color:red}-1{color} | {color:red} hadoopcheck {color} | {color:red} 10m 48s 
{color} | {color:red} The patch causes 14 errors with Hadoop v2.7.3. {color} |
| {color:red}-1{color} | {color:red} hadoopcheck {color} | {color:red} 12m 7s 
{color} | {color:red} The patch causes 14 errors with Hadoop v3.0.0-alpha3. 
{color} |
| {color:red}-1{color} | {color:red} findbugs {color} | {color:red} 0m 19s 
{color} | {color:red} hbase-server in the patch failed. {color} |
| {color:green}+1{color} | {color:green} javadoc {color} | {color:green} 0m 32s 
{color} | {color:green} the patch passed {color} |
| {color:red}-1{color} | {color:red} unit {color} | {color:red} 0m 29s {color} 
| {color:red} hbase-server in the patch failed. {color} |
| {color:green}+1{color} | {color:green} asflicense {color} | {color:green} 0m 
8s {color} | {color:green} The patch does not generate ASF License warnings. 
{color} |
| {color:black}{color} | {color:black} {color} | {color:black} 24m 42s {color} 
| {color:black} {color} |
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|| Subsystem || Report/Notes ||
| Docker | Client=1.12.3 Server=1.12.3 Image:yetus/hbase:757bf37 |
| JIRA Patch URL | 
https://issues.apache.org/jira/secure/attachment/12873540/HBASE-18221_2.patch |
| JIRA Issue | HBASE-18221 |
| Optional Tests |  asflicense  javac  javadoc  unit  findbugs  hadoopcheck  
hbaseanti  checkstyle  compile  |
| uname | Linux b44c49e9c5a4 3.13.0-105-generic #152-Ubuntu SMP Fri Dec 2 
15:37:11 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 / ce1ce72 |
| Default Java | 1.8.0_131 |
| findbugs | v3.0.0 |
| mvninstall | 
https://builds.apache.org/job/PreCommit-HBASE-Build/7238/artifact/patchprocess/patch-mvninstall-hbase-server.txt
 |
| compile | 
https://builds.apache.org/job/PreCommit-HBASE-Build/7238/artifact/patchprocess/patch-compile-hbase-server.txt
 |
| javac | 
https://builds.apache.org/job/PreCommit-HBASE-Build/7238/artifact/patchprocess/patch-compile-hbase-server.txt
 |
| whitespace | 
https://builds.apache.org/job/PreCommit-HBASE-Build/7238/artifact/patchprocess/whitespace-eol.txt
 |
| findbugs | 
https://builds.apache.org/job/PreCommit-HBASE-Build/7238/artifact/patchprocess/patch-findbugs-hbase-server.txt
 |
| unit | 
https://builds.apache.org/job/PreCommit-HBASE-Build/7238/artifact/patchprocess/patch-unit-hbase-server.txt
 |
|  Test Results | 
https://builds.apache.org/job/PreCommit-HBASE-Build/7238/testReport/ |
| modules | C: hbase-server U: hbase-server |
| Console output | 
https://builds.apache.org/job/PreCommit-HBASE-Build/7238/console |
| Powered by | Apache Yetus 0.3.0   http://yetus.apache.org |


This message was automatically generated.



> Switch from pread to stream should happen under HStore's reentrant lock
> -----------------------------------------------------------------------
>
>                 Key: HBASE-18221
>                 URL: https://issues.apache.org/jira/browse/HBASE-18221
>             Project: HBase
>          Issue Type: Sub-task
>          Components: Scanners
>    Affects Versions: 2.0.0, 3.0.0, 2.0.0-alpha-1
>            Reporter: ramkrishna.s.vasudevan
>            Assignee: ramkrishna.s.vasudevan
>             Fix For: 2.0.0, 3.0.0, 2.0.0-alpha-2
>
>         Attachments: HBASE-18221_2_fortestcasefailure.patch, 
> HBASE-18221_2.patch
>
>
> Found this while debugging HBASE-18186. When we try to reopen the scanners on 
> the storefiles while trying to switch over from pread to stream, we do not 
> use the HStore's reentrant lock to get the current Storefiles from the 
> StoreFileManager. All the scan APIs are guarded under that and we must do it 
> here also other wise the CompactedHfileDischarger may cause race issues with 
> the HStore's datastructures like here
> {code}
> 2017-06-14 18:16:17,223 WARN  
> [RpcServer.default.FPBQ.Fifo.handler=23,queue=1,port=16020] 
> regionserver.StoreScanner: failed to switch to stream read
> java.lang.NullPointerException
>         at 
> org.apache.hadoop.hbase.regionserver.StoreFileScanner.getScannersForStoreFiles(StoreFileScanner.java:133)
>         at 
> org.apache.hadoop.hbase.regionserver.HStore.getScanners(HStore.java:1221)
>         at 
> org.apache.hadoop.hbase.regionserver.StoreScanner.trySwitchToStreamRead(StoreScanner.java:997)
>         at 
> org.apache.hadoop.hbase.regionserver.StoreScanner.shipped(StoreScanner.java:1134)
>         at 
> org.apache.hadoop.hbase.regionserver.KeyValueHeap.shipped(KeyValueHeap.java:445)
>         at 
> org.apache.hadoop.hbase.regionserver.HRegion$RegionScannerImpl.shipped(HRegion.java:6459)
>         at 
> org.apache.hadoop.hbase.regionserver.RSRpcServices$RegionScannerShippedCallBack.run(RSRpcServices.java:339)
>         at 
> org.apache.hadoop.hbase.ipc.ServerCall.setResponse(ServerCall.java:252)
>         at org.apache.hadoop.hbase.ipc.CallRunner.run(CallRunner.java:166)
>         at 
> org.apache.hadoop.hbase.ipc.RpcExecutor$Handler.run(RpcExecutor.java:278)
>         at 
> org.apache.hadoop.hbase.ipc.RpcExecutor$Handler.run(RpcExecutor.java:258)
> {code}
> I have a working patch fixing this problem. Will do some more testing and try 
> to upload the patch after I write a test case for this. 



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