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