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https://issues.apache.org/jira/browse/MAPREDUCE-7094?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16478867#comment-16478867
 ] 

Hadoop QA commented on MAPREDUCE-7094:
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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 
16s{color} | {color:blue} Docker mode activated. {color} |
|| || || || {color:brown} Prechecks {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:brown} trunk Compile Tests {color} ||
| {color:green}+1{color} | {color:green} mvninstall {color} | {color:green} 23m 
52s{color} | {color:green} trunk passed {color} |
| {color:green}+1{color} | {color:green} compile {color} | {color:green}  0m 
26s{color} | {color:green} trunk passed {color} |
| {color:green}+1{color} | {color:green} checkstyle {color} | {color:green}  0m 
20s{color} | {color:green} trunk passed {color} |
| {color:green}+1{color} | {color:green} mvnsite {color} | {color:green}  0m 
29s{color} | {color:green} trunk passed {color} |
| {color:green}+1{color} | {color:green} shadedclient {color} | {color:green}  
9m 49s{color} | {color:green} branch has no errors when building and testing 
our client artifacts. {color} |
| {color:green}+1{color} | {color:green} findbugs {color} | {color:green}  0m 
42s{color} | {color:green} trunk passed {color} |
| {color:green}+1{color} | {color:green} javadoc {color} | {color:green}  0m 
23s{color} | {color:green} trunk passed {color} |
|| || || || {color:brown} Patch Compile Tests {color} ||
| {color:green}+1{color} | {color:green} mvninstall {color} | {color:green}  0m 
27s{color} | {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} compile {color} | {color:green}  0m 
20s{color} | {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} javac {color} | {color:green}  0m 
20s{color} | {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} checkstyle {color} | {color:green}  0m 
11s{color} | {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} mvnsite {color} | {color:green}  0m 
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:green}+1{color} | {color:green} shadedclient {color} | {color:green} 
10m 28s{color} | {color:green} patch has no errors when building and testing 
our client artifacts. {color} |
| {color:green}+1{color} | {color:green} findbugs {color} | {color:green}  0m 
46s{color} | {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} javadoc {color} | {color:green}  0m 
24s{color} | {color:green} the patch passed {color} |
|| || || || {color:brown} Other Tests {color} ||
| {color:green}+1{color} | {color:green} unit {color} | {color:green}  0m 
53s{color} | {color:green} hadoop-mapreduce-client-common in the patch passed. 
{color} |
| {color:green}+1{color} | {color:green} asflicense {color} | {color:green}  0m 
22s{color} | {color:green} The patch does not generate ASF License warnings. 
{color} |
| {color:black}{color} | {color:black} {color} | {color:black} 50m 38s{color} | 
{color:black} {color} |
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|| Subsystem || Report/Notes ||
| Docker | Client=17.05.0-ce Server=17.05.0-ce Image:yetus/hadoop:abb62dd |
| JIRA Issue | MAPREDUCE-7094 |
| JIRA Patch URL | 
https://issues.apache.org/jira/secure/attachment/12923894/MAPREDUCE-7094.6.patch
 |
| Optional Tests |  asflicense  compile  javac  javadoc  mvninstall  mvnsite  
unit  shadedclient  findbugs  checkstyle  |
| uname | Linux 90356d685290 4.4.0-43-generic #63-Ubuntu SMP Wed Oct 12 
13:48:03 UTC 2016 x86_64 x86_64 x86_64 GNU/Linux |
| Build tool | maven |
| Personality | /testptch/patchprocess/precommit/personality/provided.sh |
| git revision | trunk / 454de3b |
| maven | version: Apache Maven 3.3.9 |
| Default Java | 1.8.0_162 |
| findbugs | v3.1.0-RC1 |
|  Test Results | 
https://builds.apache.org/job/PreCommit-MAPREDUCE-Build/7418/testReport/ |
| Max. process+thread count | 407 (vs. ulimit of 10000) |
| modules | C: 
hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-common 
U: 
hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-common 
|
| Console output | 
https://builds.apache.org/job/PreCommit-MAPREDUCE-Build/7418/console |
| Powered by | Apache Yetus 0.8.0-SNAPSHOT   http://yetus.apache.org |


This message was automatically generated.



> LocalDistributedCacheManager leaves classloaders open, which leaks FDs
> ----------------------------------------------------------------------
>
>                 Key: MAPREDUCE-7094
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-7094
>             Project: Hadoop Map/Reduce
>          Issue Type: Bug
>    Affects Versions: 2.6.0
>            Reporter: Adam Szita
>            Assignee: Adam Szita
>            Priority: Major
>         Attachments: MAPREDUCE-7094.0.patch, MAPREDUCE-7094.1.patch, 
> MAPREDUCE-7094.2.patch, MAPREDUCE-7094.3.patch, MAPREDUCE-7094.4.patch, 
> MAPREDUCE-7094.5.patch, MAPREDUCE-7094.6.patch
>
>
> When a user starts a local mapred task from Hive's beeline, it will leave 
> open file descriptors on the HS2 process (which runs the mapred task).
> I debugged this and saw that it is caused by LocalDistributedCacheManager 
> class, which creates a new URLClassLoader, with a classpath for the two jars 
> seen below. Somewhere down the line Loaders will be created in this 
> URLClassLoader for these files effectively creating the FD's on the OS level.
> This is never cleaned up after execution, although 
> LocalDistributedCacheManager removes the files, it will not close the 
> ClassLoader, so FDs are left open although they point to deleted files at 
> that time:
> {code:java}
> [root@host-1 ~]# lsof -p 14439 | grep hadoop-hive
> java    14439 hive  DEL       REG                8,1             3348748 
> /tmp/hadoop-hive/mapred/local/1525789796610/hive-exec-core.jar
> java    14439 hive  DEL       REG                8,1             3348750 
> /tmp/hadoop-hive/mapred/local/1525789796609/hive-exec-1.1.0-cdh5.13.4-SNAPSHOT-core.jar
> java    14439 hive  649r      REG                8,1   8112438   3348750 
> /tmp/hadoop-hive/mapred/local/1525789796609/hive-exec-1.1.0-cdh5.13.4-SNAPSHOT-core.jar
>  (deleted)
> java    14439 hive  650r      REG                8,1   8112438   3348748 
> /tmp/hadoop-hive/mapred/local/1525789796610/hive-exec-core.jar (deleted)
> {code}



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