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From "Hadoop QA (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-8710) Always read DU value from the cached "dfsUsed" file on datanode startup
Date Sat, 04 Jul 2015 11:20:04 GMT

    [ https://issues.apache.org/jira/browse/HDFS-8710?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14613692#comment-14613692
] 

Hadoop QA commented on HDFS-8710:
---------------------------------

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| (x) *{color:red}-1 overall{color}* |
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|| Vote || Subsystem || Runtime || Comment ||
| {color:red}-1{color} | pre-patch |  17m 53s | Pre-patch trunk has 1 extant Findbugs (version
3.0.0) warnings. |
| {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 40s | 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 20s | There were no new checkstyle issues. |
| {color:green}+1{color} | whitespace |   0m  0s | The patch has no lines that end in whitespace.
|
| {color:green}+1{color} | install |   1m 35s | mvn install still works. |
| {color:green}+1{color} | eclipse:eclipse |   0m 33s | The patch built with eclipse:eclipse.
|
| {color:green}+1{color} | findbugs |   3m 19s | 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:red}-1{color} | hdfs tests | 158m 10s | Tests failed in hadoop-hdfs. |
| | | 204m 44s | |
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|| Reason || Tests ||
| Failed unit tests | hadoop.hdfs.server.balancer.TestBalancerWithMultipleNameNodes |
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|| Subsystem || Report/Notes ||
| Patch URL | http://issues.apache.org/jira/secure/attachment/12743258/HDFS-8710.001.patch
|
| Optional Tests | javadoc javac unit findbugs checkstyle |
| git revision | trunk / 2eae130 |
| Pre-patch Findbugs warnings | https://builds.apache.org/job/PreCommit-HDFS-Build/11571/artifact/patchprocess/trunkFindbugsWarningshadoop-hdfs.html
|
| hadoop-hdfs test log | https://builds.apache.org/job/PreCommit-HDFS-Build/11571/artifact/patchprocess/testrun_hadoop-hdfs.txt
|
| Test Results | https://builds.apache.org/job/PreCommit-HDFS-Build/11571/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/11571/console |


This message was automatically generated.

> Always read DU value from the cached "dfsUsed" file on datanode startup
> -----------------------------------------------------------------------
>
>                 Key: HDFS-8710
>                 URL: https://issues.apache.org/jira/browse/HDFS-8710
>             Project: Hadoop HDFS
>          Issue Type: Improvement
>            Reporter: Xinwei Qin 
>            Assignee: Xinwei Qin 
>         Attachments: HDFS-8710.001.patch
>
>
> Currently, DataNode will cache DU value in "dfsUsed" file termly. When DataNode starts
or restarts, it will read in the cached DU value from "dfsUsed" file if the value is less
than 600 seconds old, otherwise, it will run DU command, which is a very time-consuming operation(may
up to dozens of minutes) when DataNode has huge number of blocks.
> Since slight imprecision of dfsUsed is not critical, and the DU value will be updated
every 600 seconds (the default DU interval) after DataNode started, we can always read DU
value from the cached file (Regardless of whether this value is less than 600 seconds old
or not) and skip DU operation on DataNode startup to significantly shorten the startup time.



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