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From "Hadoop QA (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-7964) Add support for async edit logging
Date Mon, 19 Oct 2015 04:50:05 GMT

    [ https://issues.apache.org/jira/browse/HDFS-7964?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14962829#comment-14962829
] 

Hadoop QA commented on HDFS-7964:
---------------------------------

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| (x) *{color:red}-1 overall{color}* |
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|| Vote || Subsystem || Runtime || Comment ||
| {color:red}-1{color} | pre-patch |  21m 28s | 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:green}+1{color} | tests included |   0m  0s | The patch appears to include 11 new
or modified test files. |
| {color:green}+1{color} | javac |   9m 38s | There were no new javac warning messages. |
| {color:green}+1{color} | javadoc |  13m 19s | There were no new javadoc warning messages.
|
| {color:green}+1{color} | release audit |   0m 29s | The applied patch does not increase
the total number of release audit warnings. |
| {color:red}-1{color} | checkstyle |   1m 53s | The applied patch generated  10 new checkstyle
issues (total was 1190, now 1165). |
| {color:red}-1{color} | whitespace |   0m 20s | The patch has 6  line(s) that end in whitespace.
Use git apply --whitespace=fix. |
| {color:green}+1{color} | install |   1m 50s | mvn install still works. |
| {color:green}+1{color} | eclipse:eclipse |   0m 42s | The patch built with eclipse:eclipse.
|
| {color:red}-1{color} | findbugs |   4m 12s | The patch appears to introduce 1 new Findbugs
(version 3.0.0) warnings. |
| {color:green}+1{color} | native |   4m 27s | Pre-build of native portion |
| {color:red}-1{color} | hdfs tests |  71m 37s | Tests failed in hadoop-hdfs. |
| {color:green}+1{color} | hdfs tests |   6m 58s | Tests passed in bkjournal. |
| | | 137m  8s | |
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|| Reason || Tests ||
| FindBugs | module:hadoop-hdfs |
| Failed unit tests | hadoop.hdfs.TestReplaceDatanodeOnFailure |
|   | hadoop.hdfs.shortcircuit.TestShortCircuitCache |
|   | hadoop.hdfs.server.datanode.TestDirectoryScanner |
| Timed out tests | org.apache.hadoop.hdfs.TestDFSStripedOutputStreamWithFailure |
|   | org.apache.hadoop.hdfs.TestFileCreationClient |
|   | org.apache.hadoop.hdfs.qjournal.client.TestQJMWithFaults |
|   | org.apache.hadoop.hdfs.TestEncryptionZonesWithKMS |
|   | org.apache.hadoop.hdfs.TestLeaseRecovery |
|   | org.apache.hadoop.hdfs.server.namenode.TestFileTruncate |
|   | org.apache.hadoop.hdfs.server.mover.TestStorageMover |
|   | org.apache.hadoop.hdfs.server.mover.TestMover |
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|| Subsystem || Report/Notes ||
| Patch URL | http://issues.apache.org/jira/secure/attachment/12766854/HDFS-7964.patch |
| Optional Tests | javac unit findbugs checkstyle javadoc |
| git revision | trunk / 476a251 |
| checkstyle |  https://builds.apache.org/job/PreCommit-HDFS-Build/13046/artifact/patchprocess/diffcheckstylehadoop-hdfs.txt
|
| whitespace | https://builds.apache.org/job/PreCommit-HDFS-Build/13046/artifact/patchprocess/whitespace.txt
|
| Findbugs warnings | https://builds.apache.org/job/PreCommit-HDFS-Build/13046/artifact/patchprocess/newPatchFindbugsWarningshadoop-hdfs.html
|
| hadoop-hdfs test log | https://builds.apache.org/job/PreCommit-HDFS-Build/13046/artifact/patchprocess/testrun_hadoop-hdfs.txt
|
| bkjournal test log | https://builds.apache.org/job/PreCommit-HDFS-Build/13046/artifact/patchprocess/testrun_bkjournal.txt
|
| Test Results | https://builds.apache.org/job/PreCommit-HDFS-Build/13046/testReport/ |
| Java | 1.7.0_55 |
| uname | Linux asf909.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/13046/console |


This message was automatically generated.

> Add support for async edit logging
> ----------------------------------
>
>                 Key: HDFS-7964
>                 URL: https://issues.apache.org/jira/browse/HDFS-7964
>             Project: Hadoop HDFS
>          Issue Type: Sub-task
>          Components: namenode
>    Affects Versions: 2.0.2-alpha
>            Reporter: Daryn Sharp
>            Assignee: Daryn Sharp
>         Attachments: HDFS-7964.patch, HDFS-7964.patch
>
>
> Edit logging is a major source of contention within the NN.  LogEdit is called within
the namespace write log, while logSync is called outside of the lock to allow greater concurrency.
 The handler thread remains busy until logSync returns to provide the client with a durability
guarantee for the response.
> Write heavy RPC load and/or slow IO causes handlers to stall in logSync.  Although the
write lock is not held, readers are limited/starved and the call queue fills.  Combining an
edit log thread with postponed RPC responses from HADOOP-10300 will provide the same durability
guarantee but immediately free up the handlers.



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