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From "Hadoop QA (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-8959) Provide an iterator-based API for listing all the snapshottable directories
Date Wed, 26 Aug 2015 19:14:45 GMT

    [ https://issues.apache.org/jira/browse/HDFS-8959?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14715360#comment-14715360
] 

Hadoop QA commented on HDFS-8959:
---------------------------------

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| (x) *{color:red}-1 overall{color}* |
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|| Vote || Subsystem || Runtime || Comment ||
| {color:red}-1{color} | pre-patch |  19m 31s | Pre-patch trunk has 6 extant Findbugs (version
3.0.0) warnings. |
| {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 2 new
or modified test files. |
| {color:green}+1{color} | javac |   7m 44s | There were no new javac warning messages. |
| {color:green}+1{color} | javadoc |   9m 59s | There were no new javadoc warning messages.
|
| {color:green}+1{color} | release audit |   0m 22s | The applied patch does not increase
the total number of release audit warnings. |
| {color:green}+1{color} | checkstyle |   2m 32s | There were no new checkstyle issues. |
| {color:green}+1{color} | whitespace |   0m  6s | The patch has no lines that end in whitespace.
|
| {color:green}+1{color} | install |   1m 40s | mvn install still works. |
| {color:green}+1{color} | eclipse:eclipse |   0m 32s | The patch built with eclipse:eclipse.
|
| {color:green}+1{color} | findbugs |   4m 32s | The patch does not introduce any new Findbugs
(version 3.0.0) warnings. |
| {color:green}+1{color} | native |   3m 16s | Pre-build of native portion |
| {color:green}+1{color} | hdfs tests | 163m 49s | Tests passed in hadoop-hdfs. |
| {color:green}+1{color} | hdfs tests |   0m 29s | Tests passed in hadoop-hdfs-client. |
| | | 214m 35s | |
\\
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|| Subsystem || Report/Notes ||
| Patch URL | http://issues.apache.org/jira/secure/attachment/12752505/HDFS-8959-01.patch
|
| Optional Tests | javadoc javac unit findbugs checkstyle |
| git revision | trunk / a4d9acc |
| Pre-patch Findbugs warnings | https://builds.apache.org/job/PreCommit-HDFS-Build/12139/artifact/patchprocess/trunkFindbugsWarningshadoop-hdfs.html
|
| Pre-patch Findbugs warnings | https://builds.apache.org/job/PreCommit-HDFS-Build/12139/artifact/patchprocess/trunkFindbugsWarningshadoop-hdfs-client.html
|
| hadoop-hdfs test log | https://builds.apache.org/job/PreCommit-HDFS-Build/12139/artifact/patchprocess/testrun_hadoop-hdfs.txt
|
| hadoop-hdfs-client test log | https://builds.apache.org/job/PreCommit-HDFS-Build/12139/artifact/patchprocess/testrun_hadoop-hdfs-client.txt
|
| Test Results | https://builds.apache.org/job/PreCommit-HDFS-Build/12139/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/12139/console |


This message was automatically generated.

> Provide an iterator-based API for listing all the snapshottable directories
> ---------------------------------------------------------------------------
>
>                 Key: HDFS-8959
>                 URL: https://issues.apache.org/jira/browse/HDFS-8959
>             Project: Hadoop HDFS
>          Issue Type: Improvement
>            Reporter: Rakesh R
>            Assignee: Rakesh R
>         Attachments: HDFS-8959-00.patch, HDFS-8959-01.patch
>
>
> Presently {{DistributedFileSystem#getSnapshottableDirListing()}} is sending all the {{SnapshottableDirectoryStatus[]}}
array to the clients. Now the client should have enough space to hold it in memory. There
could be chance that the client JVMs running out of memory because of this. Also, some time
back there was a [comment|https://issues.apache.org/jira/browse/HDFS-8643?focusedCommentId=14658800&page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#comment-14658800]
about RPC packet limitation and a large number of snapshot list can again cause issues.
> I believe iterator based {{DistributedFileSystem#listSnapshottableDirs()}} API would
be a good addition!



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