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https://issues.apache.org/jira/browse/HADOOP-13427?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15428925#comment-15428925
 ] 

Hadoop QA commented on HADOOP-13427:
------------------------------------

| (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 
16s{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:blue}0{color} | {color:blue} mvndep {color} | {color:blue}  0m 
17s{color} | {color:blue} Maven dependency ordering for branch {color} |
| {color:green}+1{color} | {color:green} mvninstall {color} | {color:green}  7m 
16s{color} | {color:green} trunk passed {color} |
| {color:green}+1{color} | {color:green} compile {color} | {color:green}  8m  
5s{color} | {color:green} trunk passed {color} |
| {color:green}+1{color} | {color:green} checkstyle {color} | {color:green}  1m 
37s{color} | {color:green} trunk passed {color} |
| {color:green}+1{color} | {color:green} mvnsite {color} | {color:green}  8m 
41s{color} | {color:green} trunk passed {color} |
| {color:green}+1{color} | {color:green} mvneclipse {color} | {color:green}  4m 
29s{color} | {color:green} trunk passed {color} |
| {color:green}+1{color} | {color:green} findbugs {color} | {color:green} 13m 
11s{color} | {color:green} trunk passed {color} |
| {color:green}+1{color} | {color:green} javadoc {color} | {color:green}  6m 
45s{color} | {color:green} trunk passed {color} |
| {color:blue}0{color} | {color:blue} mvndep {color} | {color:blue}  0m 
17s{color} | {color:blue} Maven dependency ordering for patch {color} |
| {color:green}+1{color} | {color:green} mvninstall {color} | {color:green}  7m 
52s{color} | {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} compile {color} | {color:green}  7m 
46s{color} | {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} javac {color} | {color:green}  7m 
46s{color} | {color:green} the patch passed {color} |
| {color:orange}-0{color} | {color:orange} checkstyle {color} | {color:orange}  
1m 41s{color} | {color:orange} root: The patch generated 8 new + 861 unchanged 
- 10 fixed = 869 total (was 871) {color} |
| {color:green}+1{color} | {color:green} mvnsite {color} | {color:green}  9m 
17s{color} | {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} mvneclipse {color} | {color:green}  5m 
22s{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 
59s{color} | {color:red} 
hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-nodemanager
 generated 1 new + 0 unchanged - 0 fixed = 1 total (was 0) {color} |
| {color:red}-1{color} | {color:red} findbugs {color} | {color:red}  0m 
46s{color} | {color:red} hadoop-tools/hadoop-rumen generated 1 new + 0 
unchanged - 0 fixed = 1 total (was 0) {color} |
| {color:green}+1{color} | {color:green} javadoc {color} | {color:green}  7m 
26s{color} | {color:green} the patch passed {color} |
| {color:red}-1{color} | {color:red} unit {color} | {color:red}  7m 58s{color} 
| {color:red} hadoop-common in the patch failed. {color} |
| {color:green}+1{color} | {color:green} unit {color} | {color:green}  1m  
3s{color} | {color:green} hadoop-hdfs-client in the patch passed. {color} |
| {color:red}-1{color} | {color:red} unit {color} | {color:red} 56m 17s{color} 
| {color:red} hadoop-hdfs in the patch failed. {color} |
| {color:red}-1{color} | {color:red} unit {color} | {color:red}  2m 33s{color} 
| {color:red} hadoop-yarn-common in the patch failed. {color} |
| {color:green}+1{color} | {color:green} unit {color} | {color:green} 13m 
29s{color} | {color:green} hadoop-yarn-server-nodemanager in the patch passed. 
{color} |
| {color:red}-1{color} | {color:red} unit {color} | {color:red}  2m 56s{color} 
| {color:red} hadoop-yarn-server-applicationhistoryservice in the patch failed. 
{color} |
| {color:green}+1{color} | {color:green} unit {color} | {color:green}  0m 
35s{color} | {color:green} hadoop-yarn-server-sharedcachemanager in the patch 
passed. {color} |
| {color:red}-1{color} | {color:red} unit {color} | {color:red}  2m 15s{color} 
| {color:red} hadoop-mapreduce-client-core in the patch failed. {color} |
| {color:green}+1{color} | {color:green} unit {color} | {color:green}  9m  
3s{color} | {color:green} hadoop-mapreduce-client-app in the patch passed. 
{color} |
| {color:green}+1{color} | {color:green} unit {color} | {color:green}  6m 
44s{color} | {color:green} hadoop-mapreduce-client-hs in the patch passed. 
{color} |
| {color:green}+1{color} | {color:green} unit {color} | {color:green}  0m 
40s{color} | {color:green} hadoop-mapreduce-examples in the patch passed. 
{color} |
| {color:red}-1{color} | {color:red} unit {color} | {color:red}  9m  3s{color} 
| {color:red} hadoop-distcp in the patch failed. {color} |
| {color:green}+1{color} | {color:green} unit {color} | {color:green}  0m 
58s{color} | {color:green} hadoop-archives in the patch passed. {color} |
| {color:green}+1{color} | {color:green} unit {color} | {color:green}  0m 
43s{color} | {color:green} hadoop-archive-logs in the patch passed. {color} |
| {color:green}+1{color} | {color:green} unit {color} | {color:green}  0m 
28s{color} | {color:green} hadoop-rumen in the patch passed. {color} |
| {color:green}+1{color} | {color:green} unit {color} | {color:green}  0m 
59s{color} | {color:green} hadoop-extras in the patch passed. {color} |
| {color:green}+1{color} | {color:green} unit {color} | {color:green}  0m 
22s{color} | {color:green} hadoop-openstack in the patch passed. {color} |
| {color:green}+1{color} | {color:green} unit {color} | {color:green}  1m 
28s{color} | {color:green} hadoop-azure in the patch passed. {color} |
| {color:green}+1{color} | {color:green} asflicense {color} | {color:green}  0m 
30s{color} | {color:green} The patch does not generate ASF License warnings. 
{color} |
| {color:black}{color} | {color:black} {color} | {color:black}252m 34s{color} | 
{color:black} {color} |
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|| Reason || Tests ||
| FindBugs | 
module:hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-nodemanager
 |
|  |  
org.apache.hadoop.yarn.server.nodemanager.containermanager.localizer.sharedcache.SharedCacheUploader.deleteTempFile(Path)
 might ignore java.io.IOException  At SharedCacheUploader.java:At 
SharedCacheUploader.java:[line 198] |
| FindBugs | module:hadoop-tools/hadoop-rumen |
|  |  Dead store to fs in 
org.apache.hadoop.tools.rumen.state.StatePool.reload()  At 
StatePool.java:org.apache.hadoop.tools.rumen.state.StatePool.reload()  At 
StatePool.java:[line 190] |
| Failed junit tests | hadoop.fs.TestLocalFileSystem |
|   | hadoop.hdfs.TestRollingUpgrade |
|   | hadoop.hdfs.web.TestWebHDFSForHA |
|   | hadoop.hdfs.server.namenode.ha.TestStandbyCheckpoints |
|   | hadoop.hdfs.tools.TestDFSZKFailoverController |
|   | hadoop.hdfs.server.namenode.ha.TestInitializeSharedEdits |
|   | hadoop.hdfs.TestDFSInotifyEventInputStream |
|   | hadoop.hdfs.TestDecommission |
|   | hadoop.hdfs.server.datanode.TestDataNodeMultipleRegistrations |
|   | hadoop.hdfs.server.mover.TestMover |
|   | hadoop.hdfs.server.namenode.ha.TestLossyRetryInvocationHandler |
|   | hadoop.hdfs.server.namenode.TestEditLogAutoroll |
|   | hadoop.hdfs.server.namenode.ha.TestDNFencing |
|   | hadoop.hdfs.TestRollingUpgradeDowngrade |
|   | hadoop.hdfs.TestDFSShell |
|   | hadoop.hdfs.server.namenode.ha.TestDNFencingWithReplication |
|   | hadoop.hdfs.TestDFSClientFailover |
|   | hadoop.hdfs.tools.TestDFSHAAdminMiniCluster |
|   | hadoop.hdfs.server.mover.TestStorageMover |
|   | hadoop.hdfs.server.namenode.ha.TestBootstrapStandby |
|   | hadoop.hdfs.server.namenode.ha.TestBootstrapStandbyWithQJM |
|   | hadoop.hdfs.server.namenode.snapshot.TestSnapshotDeletion |
|   | hadoop.hdfs.server.namenode.ha.TestRetryCacheWithHA |
|   | hadoop.hdfs.server.namenode.ha.TestXAttrsWithHA |
|   | hadoop.hdfs.server.namenode.ha.TestStandbyInProgressTail |
|   | hadoop.hdfs.server.namenode.ha.TestHAFsck |
|   | hadoop.hdfs.server.namenode.TestNamenodeRetryCache |
|   | hadoop.hdfs.server.namenode.ha.TestNNHealthCheck |
|   | hadoop.hdfs.TestMiniDFSCluster |
|   | hadoop.hdfs.server.namenode.ha.TestStandbyBlockManagement |
|   | hadoop.metrics2.sink.TestRollingFileSystemSinkWithHdfs |
|   | hadoop.hdfs.server.namenode.ha.TestFailoverWithBlockTokensEnabled |
|   | hadoop.hdfs.tools.TestDFSAdminWithHA |
|   | hadoop.hdfs.server.namenode.ha.TestHASafeMode |
|   | hadoop.hdfs.server.namenode.ha.TestStandbyIsHot |
|   | hadoop.hdfs.server.namenode.ha.TestStateTransitionFailure |
|   | hadoop.hdfs.server.namenode.ha.TestGetGroupsWithHA |
|   | hadoop.hdfs.server.namenode.TestNameNodeMXBean |
|   | hadoop.hdfs.server.namenode.ha.TestPendingCorruptDnMessages |
|   | hadoop.hdfs.server.namenode.ha.TestDelegationTokensWithHA |
|   | hadoop.hdfs.server.namenode.ha.TestSeveralNameNodes |
|   | hadoop.hdfs.server.namenode.ha.TestEditLogTailer |
|   | hadoop.hdfs.TestEncryptionZonesWithHA |
|   | hadoop.hdfs.server.namenode.ha.TestHAStateTransitions |
|   | hadoop.hdfs.TestRollingUpgradeRollback |
|   | hadoop.hdfs.server.namenode.ha.TestQuotasWithHA |
|   | hadoop.hdfs.server.namenode.ha.TestHAAppend |
|   | hadoop.hdfs.server.datanode.TestBlockReplacement |
|   | hadoop.hdfs.server.namenode.ha.TestHAMetrics |
|   | hadoop.hdfs.server.namenode.ha.TestPipelinesFailover |
|   | hadoop.hdfs.server.namenode.ha.TestDFSUpgradeWithHA |
|   | hadoop.hdfs.server.namenode.ha.TestFailureOfSharedDir |
|   | hadoop.hdfs.server.namenode.TestNameNodeRetryCacheMetrics |
|   | hadoop.hdfs.qjournal.TestNNWithQJM |
|   | hadoop.hdfs.server.namenode.ha.TestHarFileSystemWithHA |
|   | hadoop.hdfs.server.namenode.ha.TestEditLogsDuringFailover |
|   | hadoop.hdfs.server.namenode.ha.TestFailureToReadEdits |
|   | hadoop.hdfs.server.datanode.TestLargeBlockReport |
|   | hadoop.hdfs.server.balancer.TestBalancerWithHANameNodes |
|   | hadoop.yarn.nodelabels.TestFileSystemNodeLabelsStore |
|   | hadoop.yarn.server.applicationhistoryservice.webapp.TestAHSWebServices |
|   | 
hadoop.yarn.server.applicationhistoryservice.TestFileSystemApplicationHistoryStore
 |
|   | hadoop.mapreduce.lib.output.TestPreemptableFileOutputCommitter |
|   | hadoop.tools.TestIntegration |
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|| Subsystem || Report/Notes ||
| Docker |  Image:yetus/hadoop:9560f25 |
| JIRA Patch URL | 
https://issues.apache.org/jira/secure/attachment/12824612/HADOOP-13427-001.patch
 |
| JIRA Issue | HADOOP-13427 |
| Optional Tests |  asflicense  compile  javac  javadoc  mvninstall  mvnsite  
unit  findbugs  checkstyle  |
| uname | Linux acae5eda1383 3.13.0-36-lowlatency #63-Ubuntu SMP PREEMPT Wed 
Sep 3 21:56:12 UTC 2014 x86_64 x86_64 x86_64 GNU/Linux |
| Build tool | maven |
| Personality | /testptch/hadoop/patchprocess/precommit/personality/provided.sh 
|
| git revision | trunk / 03a9343 |
| Default Java | 1.8.0_101 |
| findbugs | v3.0.0 |
| checkstyle | 
https://builds.apache.org/job/PreCommit-HADOOP-Build/10310/artifact/patchprocess/diff-checkstyle-root.txt
 |
| findbugs | 
https://builds.apache.org/job/PreCommit-HADOOP-Build/10310/artifact/patchprocess/new-findbugs-hadoop-yarn-project_hadoop-yarn_hadoop-yarn-server_hadoop-yarn-server-nodemanager.html
 |
| findbugs | 
https://builds.apache.org/job/PreCommit-HADOOP-Build/10310/artifact/patchprocess/new-findbugs-hadoop-tools_hadoop-rumen.html
 |
| unit | 
https://builds.apache.org/job/PreCommit-HADOOP-Build/10310/artifact/patchprocess/patch-unit-hadoop-common-project_hadoop-common.txt
 |
| unit | 
https://builds.apache.org/job/PreCommit-HADOOP-Build/10310/artifact/patchprocess/patch-unit-hadoop-hdfs-project_hadoop-hdfs.txt
 |
| unit | 
https://builds.apache.org/job/PreCommit-HADOOP-Build/10310/artifact/patchprocess/patch-unit-hadoop-yarn-project_hadoop-yarn_hadoop-yarn-common.txt
 |
| unit | 
https://builds.apache.org/job/PreCommit-HADOOP-Build/10310/artifact/patchprocess/patch-unit-hadoop-yarn-project_hadoop-yarn_hadoop-yarn-server_hadoop-yarn-server-applicationhistoryservice.txt
 |
| unit | 
https://builds.apache.org/job/PreCommit-HADOOP-Build/10310/artifact/patchprocess/patch-unit-hadoop-mapreduce-project_hadoop-mapreduce-client_hadoop-mapreduce-client-core.txt
 |
| unit | 
https://builds.apache.org/job/PreCommit-HADOOP-Build/10310/artifact/patchprocess/patch-unit-hadoop-tools_hadoop-distcp.txt
 |
|  Test Results | 
https://builds.apache.org/job/PreCommit-HADOOP-Build/10310/testReport/ |
| modules | C: hadoop-common-project/hadoop-common 
hadoop-hdfs-project/hadoop-hdfs-client hadoop-hdfs-project/hadoop-hdfs 
hadoop-yarn-project/hadoop-yarn/hadoop-yarn-common 
hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-nodemanager
 
hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-applicationhistoryservice
 
hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-sharedcachemanager
 hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-core 
hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-app 
hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-hs 
hadoop-mapreduce-project/hadoop-mapreduce-examples hadoop-tools/hadoop-distcp 
hadoop-tools/hadoop-archives hadoop-tools/hadoop-archive-logs 
hadoop-tools/hadoop-rumen hadoop-tools/hadoop-extras 
hadoop-tools/hadoop-openstack hadoop-tools/hadoop-azure U: . |
| Console output | 
https://builds.apache.org/job/PreCommit-HADOOP-Build/10310/console |
| Powered by | Apache Yetus 0.4.0-SNAPSHOT   http://yetus.apache.org |


This message was automatically generated.



> Eliminate needless uses of FileSystem.exists, isFile, isDirectory 
> ------------------------------------------------------------------
>
>                 Key: HADOOP-13427
>                 URL: https://issues.apache.org/jira/browse/HADOOP-13427
>             Project: Hadoop Common
>          Issue Type: Improvement
>          Components: fs
>    Affects Versions: 2.8.0
>            Reporter: Steve Loughran
>            Assignee: Steve Loughran
>            Priority: Minor
>         Attachments: HADOOP-13427-001.patch
>
>
> We're cleaning up Hive and Spark's use of FileSystem.exists, because it is 
> often the case we see code of exists+open, exists+delete, when the exists 
> probe is needless. Against object stores, expensive needless.
> Hadoop can set an example here by stripping them out. It will also show where 
> there are opportunities to optimise things better and/or improve reporting.



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