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From "Hadoop QA (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-8873) throttle directoryScanner
Date Tue, 15 Sep 2015 00:08:48 GMT

    [ https://issues.apache.org/jira/browse/HDFS-8873?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14744544#comment-14744544
] 

Hadoop QA commented on HDFS-8873:
---------------------------------

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| (x) *{color:red}-1 overall{color}* |
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|| Vote || Subsystem || Runtime || Comment ||
| {color:blue}0{color} | pre-patch |  17m 47s | Pre-patch trunk compilation is healthy. |
| {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 1 new
or modified test files. |
| {color:green}+1{color} | javac |   7m 51s | There were no new javac warning messages. |
| {color:green}+1{color} | javadoc |  10m  8s | There were no new javadoc warning messages.
|
| {color:red}-1{color} | release audit |   0m 20s | The applied patch generated 1 release
audit warnings. |
| {color:red}-1{color} | checkstyle |   1m 26s | The applied patch generated  4 new checkstyle
issues (total was 442, now 422). |
| {color:red}-1{color} | whitespace |   0m 10s | The patch has 1  line(s) that end in whitespace.
Use git apply --whitespace=fix. |
| {color:green}+1{color} | install |   1m 33s | mvn install still works. |
| {color:green}+1{color} | eclipse:eclipse |   0m 35s | The patch built with eclipse:eclipse.
|
| {color:red}-1{color} | findbugs |   2m 41s | The patch appears to introduce 1 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 | 168m  7s | Tests failed in hadoop-hdfs. |
| | | 214m  2s | |
\\
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|| Reason || Tests ||
| FindBugs | module:hadoop-hdfs |
| Failed unit tests | hadoop.hdfs.server.datanode.fsdataset.impl.TestLazyWriter |
|   | hadoop.hdfs.web.TestWebHDFSOAuth2 |
|   | hadoop.hdfs.server.datanode.fsdataset.impl.TestLazyPersistLockedMemory |
|   | hadoop.hdfs.server.namenode.TestSaveNamespace |
|   | hadoop.hdfs.server.datanode.TestIncrementalBrVariations |
|   | hadoop.tools.TestJMXGet |
|   | hadoop.hdfs.server.datanode.fsdataset.impl.TestLazyPersistReplicaPlacement |
|   | hadoop.hdfs.server.datanode.TestDataNodeVolumeFailureToleration |
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|| Subsystem || Report/Notes ||
| Patch URL | http://issues.apache.org/jira/secure/attachment/12755813/HDFS-8873.002.patch
|
| Optional Tests | javadoc javac unit findbugs checkstyle |
| git revision | trunk / 6955771 |
| Release Audit | https://builds.apache.org/job/PreCommit-HDFS-Build/12432/artifact/patchprocess/patchReleaseAuditProblems.txt
|
| checkstyle |  https://builds.apache.org/job/PreCommit-HDFS-Build/12432/artifact/patchprocess/diffcheckstylehadoop-hdfs.txt
|
| whitespace | https://builds.apache.org/job/PreCommit-HDFS-Build/12432/artifact/patchprocess/whitespace.txt
|
| Findbugs warnings | https://builds.apache.org/job/PreCommit-HDFS-Build/12432/artifact/patchprocess/newPatchFindbugsWarningshadoop-hdfs.html
|
| hadoop-hdfs test log | https://builds.apache.org/job/PreCommit-HDFS-Build/12432/artifact/patchprocess/testrun_hadoop-hdfs.txt
|
| Test Results | https://builds.apache.org/job/PreCommit-HDFS-Build/12432/testReport/ |
| Java | 1.7.0_55 |
| uname | Linux asf906.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/12432/console |


This message was automatically generated.

> throttle directoryScanner
> -------------------------
>
>                 Key: HDFS-8873
>                 URL: https://issues.apache.org/jira/browse/HDFS-8873
>             Project: Hadoop HDFS
>          Issue Type: Improvement
>          Components: datanode
>    Affects Versions: 2.7.1
>            Reporter: Nathan Roberts
>            Assignee: Daniel Templeton
>         Attachments: HDFS-8873.001.patch, HDFS-8873.002.patch
>
>
> The new 2-level directory layout can make directory scans expensive in terms of disk
seeks (see HDFS-8791) for details. 
> It would be good if the directoryScanner() had a configurable duty cycle that would reduce
its impact on disk performance (much like the approach in HDFS-8617). 
> Without such a throttle, disks can go 100% busy for many minutes at a time (assuming
the common case of all inodes in cache but no directory blocks cached, 64K seeks are required
for full directory listing which translates to 655 seconds) 



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