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From "Hadoop QA (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-1605) Convert DFSInputStream synchronized sections to a ReadWrite lock
Date Mon, 18 May 2015 11:18:00 GMT

    [ https://issues.apache.org/jira/browse/HDFS-1605?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14547880#comment-14547880
] 

Hadoop QA commented on HDFS-1605:
---------------------------------

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| (x) *{color:red}-1 overall{color}* |
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|| Vote || Subsystem || Runtime || Comment ||
| {color:blue}0{color} | pre-patch |  14m 37s | Pre-patch trunk compilation is healthy. |
| {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 33s | There were no new javac warning messages. |
| {color:green}+1{color} | javadoc |   9m 33s | 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 16s | There were no new checkstyle issues. |
| {color:green}+1{color} | whitespace |   0m  1s | The patch has no lines that end in whitespace.
|
| {color:green}+1{color} | install |   1m 33s | mvn install still works. |
| {color:green}+1{color} | eclipse:eclipse |   0m 33s | The patch built with eclipse:eclipse.
|
| {color:green}+1{color} | findbugs |   3m  3s | The patch does not introduce any new Findbugs
(version 2.0.3) warnings. |
| {color:green}+1{color} | native |   3m 12s | Pre-build of native portion |
| {color:green}+1{color} | hdfs tests | 164m 46s | Tests passed in hadoop-hdfs. |
| | | 207m 34s | |
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|| Subsystem || Report/Notes ||
| Patch URL | http://issues.apache.org/jira/secure/attachment/12733470/HADOOP-1605-trunk-2.patch
|
| Optional Tests | javadoc javac unit findbugs checkstyle |
| git revision | trunk / a46506d |
| hadoop-hdfs test log | https://builds.apache.org/job/PreCommit-HDFS-Build/11026/artifact/patchprocess/testrun_hadoop-hdfs.txt
|
| Test Results | https://builds.apache.org/job/PreCommit-HDFS-Build/11026/testReport/ |
| Java | 1.7.0_55 |
| uname | Linux asf905.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/11026/console |


This message was automatically generated.

> Convert DFSInputStream synchronized sections to a ReadWrite lock
> ----------------------------------------------------------------
>
>                 Key: HDFS-1605
>                 URL: https://issues.apache.org/jira/browse/HDFS-1605
>             Project: Hadoop HDFS
>          Issue Type: Improvement
>          Components: hdfs-client
>            Reporter: dhruba borthakur
>            Assignee: kartheek muthyala
>              Labels: BB2015-05-RFC
>         Attachments: DFSClientRWlock.1.txt, DFSClientRWlock.3.txt, HADOOP-1605-trunk-1.patch,
HADOOP-1605-trunk-2.patch, HADOOP-1605-trunk.patch, HDFS-1605.txt
>
>
> Hbase does concurrent preads from multiple threads to different blocks of the same hdfs
file. Each of these pread calls invoke DFSInputStream.getFileLength() and DFSInputStream.getBlockAt().
These methods are "synchronized", thus causing all the concurrent threads to serialize. It
would help performance to convert this to a Read/Write lock



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