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https://issues.apache.org/jira/browse/HDFS-11476?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15893360#comment-15893360
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Hadoop QA commented on HDFS-11476:
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| (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 
13s{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:red}-1{color} | {color:red} mvninstall {color} | {color:red}  3m 
17s{color} | {color:red} root in trunk failed. {color} |
| {color:red}-1{color} | {color:red} compile {color} | {color:red}  0m 
27s{color} | {color:red} hadoop-hdfs in trunk failed. {color} |
| {color:green}+1{color} | {color:green} checkstyle {color} | {color:green}  0m 
34s{color} | {color:green} trunk passed {color} |
| {color:red}-1{color} | {color:red} mvnsite {color} | {color:red}  0m 
29s{color} | {color:red} hadoop-hdfs in trunk failed. {color} |
| {color:green}+1{color} | {color:green} mvneclipse {color} | {color:green}  0m 
11s{color} | {color:green} trunk passed {color} |
| {color:red}-1{color} | {color:red} findbugs {color} | {color:red}  0m 
19s{color} | {color:red} hadoop-hdfs in trunk failed. {color} |
| {color:green}+1{color} | {color:green} javadoc {color} | {color:green}  0m 
38s{color} | {color:green} trunk passed {color} |
| {color:red}-1{color} | {color:red} mvninstall {color} | {color:red}  0m 
26s{color} | {color:red} hadoop-hdfs in the patch failed. {color} |
| {color:red}-1{color} | {color:red} compile {color} | {color:red}  0m 
26s{color} | {color:red} hadoop-hdfs in the patch failed. {color} |
| {color:red}-1{color} | {color:red} javac {color} | {color:red}  0m 26s{color} 
| {color:red} hadoop-hdfs in the patch failed. {color} |
| {color:orange}-0{color} | {color:orange} checkstyle {color} | {color:orange}  
0m 32s{color} | {color:orange} hadoop-hdfs-project/hadoop-hdfs: The patch 
generated 1 new + 81 unchanged - 1 fixed = 82 total (was 82) {color} |
| {color:red}-1{color} | {color:red} mvnsite {color} | {color:red}  0m 
27s{color} | {color:red} hadoop-hdfs in the patch failed. {color} |
| {color:green}+1{color} | {color:green} mvneclipse {color} | {color:green}  0m 
10s{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:red}-1{color} | {color:red} findbugs {color} | {color:red}  0m 
17s{color} | {color:red} hadoop-hdfs in the patch failed. {color} |
| {color:green}+1{color} | {color:green} javadoc {color} | {color:green}  0m 
37s{color} | {color:green} the patch passed {color} |
| {color:red}-1{color} | {color:red} unit {color} | {color:red}  0m 27s{color} 
| {color:red} hadoop-hdfs in the patch failed. {color} |
| {color:green}+1{color} | {color:green} asflicense {color} | {color:green}  0m 
17s{color} | {color:green} The patch does not generate ASF License warnings. 
{color} |
| {color:black}{color} | {color:black} {color} | {color:black} 10m 51s{color} | 
{color:black} {color} |
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|| Subsystem || Report/Notes ||
| Docker |  Image:yetus/hadoop:a9ad5d6 |
| JIRA Issue | HDFS-11476 |
| JIRA Patch URL | 
https://issues.apache.org/jira/secure/attachment/12855738/HDFS-11476.002.patch |
| Optional Tests |  asflicense  compile  javac  javadoc  mvninstall  mvnsite  
unit  findbugs  checkstyle  |
| uname | Linux 376cb2643d52 3.13.0-107-generic #154-Ubuntu SMP Tue Dec 20 
09:57:27 UTC 2016 x86_64 x86_64 x86_64 GNU/Linux |
| Build tool | maven |
| Personality | /testptch/hadoop/patchprocess/precommit/personality/provided.sh 
|
| git revision | trunk / e61491d |
| Default Java | 1.8.0_121 |
| mvninstall | 
https://builds.apache.org/job/PreCommit-HDFS-Build/18526/artifact/patchprocess/branch-mvninstall-root.txt
 |
| compile | 
https://builds.apache.org/job/PreCommit-HDFS-Build/18526/artifact/patchprocess/branch-compile-hadoop-hdfs-project_hadoop-hdfs.txt
 |
| mvnsite | 
https://builds.apache.org/job/PreCommit-HDFS-Build/18526/artifact/patchprocess/branch-mvnsite-hadoop-hdfs-project_hadoop-hdfs.txt
 |
| findbugs | 
https://builds.apache.org/job/PreCommit-HDFS-Build/18526/artifact/patchprocess/branch-findbugs-hadoop-hdfs-project_hadoop-hdfs.txt
 |
| mvninstall | 
https://builds.apache.org/job/PreCommit-HDFS-Build/18526/artifact/patchprocess/patch-mvninstall-hadoop-hdfs-project_hadoop-hdfs.txt
 |
| compile | 
https://builds.apache.org/job/PreCommit-HDFS-Build/18526/artifact/patchprocess/patch-compile-hadoop-hdfs-project_hadoop-hdfs.txt
 |
| javac | 
https://builds.apache.org/job/PreCommit-HDFS-Build/18526/artifact/patchprocess/patch-compile-hadoop-hdfs-project_hadoop-hdfs.txt
 |
| checkstyle | 
https://builds.apache.org/job/PreCommit-HDFS-Build/18526/artifact/patchprocess/diff-checkstyle-hadoop-hdfs-project_hadoop-hdfs.txt
 |
| mvnsite | 
https://builds.apache.org/job/PreCommit-HDFS-Build/18526/artifact/patchprocess/patch-mvnsite-hadoop-hdfs-project_hadoop-hdfs.txt
 |
| findbugs | 
https://builds.apache.org/job/PreCommit-HDFS-Build/18526/artifact/patchprocess/patch-findbugs-hadoop-hdfs-project_hadoop-hdfs.txt
 |
| unit | 
https://builds.apache.org/job/PreCommit-HDFS-Build/18526/artifact/patchprocess/patch-unit-hadoop-hdfs-project_hadoop-hdfs.txt
 |
|  Test Results | 
https://builds.apache.org/job/PreCommit-HDFS-Build/18526/testReport/ |
| modules | C: hadoop-hdfs-project/hadoop-hdfs U: 
hadoop-hdfs-project/hadoop-hdfs |
| Console output | 
https://builds.apache.org/job/PreCommit-HDFS-Build/18526/console |
| Powered by | Apache Yetus 0.5.0-SNAPSHOT   http://yetus.apache.org |


This message was automatically generated.



> Fix NPE in FsDatasetImpl#checkAndUpdate
> ---------------------------------------
>
>                 Key: HDFS-11476
>                 URL: https://issues.apache.org/jira/browse/HDFS-11476
>             Project: Hadoop HDFS
>          Issue Type: Bug
>          Components: datanode
>            Reporter: Xiaobing Zhou
>            Assignee: Xiaobing Zhou
>         Attachments: HDFS-11476.000.patch, HDFS-11476.001.patch, 
> HDFS-11476.002.patch
>
>
> diskMetaFile can be null and passed to compareTo which dereferences it, 
> causing NPE
> {code}
> // Compare generation stamp
>       if (memBlockInfo.getGenerationStamp() != diskGS) {
>         File memMetaFile = FsDatasetUtil.getMetaFile(diskFile, 
>             memBlockInfo.getGenerationStamp());
>         if (memMetaFile.exists()) {
>           if (memMetaFile.compareTo(diskMetaFile) != 0) {
>             LOG.warn("Metadata file in memory "
>                 + memMetaFile.getAbsolutePath()
>                 + " does not match file found by scan "
>                 + (diskMetaFile == null? null: 
> diskMetaFile.getAbsolutePath()));
>           }
>         } else {
> {code}



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