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https://issues.apache.org/jira/browse/HDFS-8855?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14717960#comment-14717960
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Hadoop QA commented on HDFS-8855:
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| (x) *{color:red}-1 overall{color}* |
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|| Vote || Subsystem || Runtime || Comment ||
| {color:red}-1{color} | pre-patch | 17m 34s | Findbugs (version 3.0.0)
appears to be broken on trunk. |
| {color:green}+1{color} | @author | 0m 0s | The patch does not contain any
@author tags. |
| {color:red}-1{color} | tests included | 0m 0s | 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:green}+1{color} | javac | 7m 58s | There were no new javac warning
messages. |
| {color:green}+1{color} | javadoc | 10m 19s | There were no new javadoc
warning messages. |
| {color:red}-1{color} | release audit | 0m 21s | The applied patch generated
1 release audit warnings. |
| {color:red}-1{color} | checkstyle | 1m 20s | The applied patch generated 2
new checkstyle issues (total was 417, now 418). |
| {color:green}+1{color} | whitespace | 0m 0s | The patch has no lines that
end in whitespace. |
| {color:green}+1{color} | install | 1m 38s | mvn install still works. |
| {color:green}+1{color} | eclipse:eclipse | 0m 35s | The patch built with
eclipse:eclipse. |
| {color:red}-1{color} | findbugs | 2m 38s | The patch appears to introduce 3
new Findbugs (version 3.0.0) warnings. |
| {color:green}+1{color} | native | 3m 20s | Pre-build of native portion |
| {color:red}-1{color} | hdfs tests | 195m 18s | Tests failed in hadoop-hdfs. |
| | | 241m 5s | |
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|| Reason || Tests ||
| FindBugs | module:hadoop-hdfs |
| Failed unit tests | hadoop.hdfs.TestHDFSTrash |
| | hadoop.hdfs.server.namenode.TestFileTruncate |
| | hadoop.hdfs.server.blockmanagement.TestComputeInvalidateWork |
| | hadoop.hdfs.TestLeaseRecovery2 |
| | hadoop.hdfs.server.blockmanagement.TestNodeCount |
| | hadoop.hdfs.TestRollingUpgrade |
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|| Subsystem || Report/Notes ||
| Patch URL |
http://issues.apache.org/jira/secure/attachment/12752882/HDFS-8855.2.patch |
| Optional Tests | javadoc javac unit findbugs checkstyle |
| git revision | trunk / a9c8ea7 |
| Release Audit |
https://builds.apache.org/job/PreCommit-HDFS-Build/12179/artifact/patchprocess/patchReleaseAuditProblems.txt
|
| checkstyle |
https://builds.apache.org/job/PreCommit-HDFS-Build/12179/artifact/patchprocess/diffcheckstylehadoop-hdfs.txt
|
| Findbugs warnings |
https://builds.apache.org/job/PreCommit-HDFS-Build/12179/artifact/patchprocess/newPatchFindbugsWarningshadoop-hdfs.html
|
| hadoop-hdfs test log |
https://builds.apache.org/job/PreCommit-HDFS-Build/12179/artifact/patchprocess/testrun_hadoop-hdfs.txt
|
| Test Results |
https://builds.apache.org/job/PreCommit-HDFS-Build/12179/testReport/ |
| Java | 1.7.0_55 |
| uname | Linux asf908.gq1.ygridcore.net 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 |
| Console output |
https://builds.apache.org/job/PreCommit-HDFS-Build/12179/console |
This message was automatically generated.
> Webhdfs client leaks active NameNode connections
> ------------------------------------------------
>
> Key: HDFS-8855
> URL: https://issues.apache.org/jira/browse/HDFS-8855
> Project: Hadoop HDFS
> Issue Type: Bug
> Components: webhdfs
> Environment: HDP 2.2
> Reporter: Bob Hansen
> Assignee: Xiaobing Zhou
> Attachments: HDFS-8855.1.patch, HDFS-8855.2.patch,
> HDFS_8855.prototype.patch
>
>
> The attached script simulates a process opening ~50 files via webhdfs and
> performing random reads. Note that there are at most 50 concurrent reads,
> and all webhdfs sessions are kept open. Each read is ~64k at a random
> position.
> The script periodically (once per second) shells into the NameNode and
> produces a summary of the socket states. For my test cluster with 5 nodes,
> it took ~30 seconds for the NameNode to have ~25000 active connections and
> fails.
> It appears that each request to the webhdfs client is opening a new
> connection to the NameNode and keeping it open after the request is complete.
> If the process continues to run, eventually (~30-60 seconds), all of the
> open connections are closed and the NameNode recovers.
> This smells like SoftReference reaping. Are we using SoftReferences in the
> webhdfs client to cache NameNode connections but never re-using them?
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