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From "Hadoop QA (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-9044) Give Priority to FavouredNodes , before selecting nodes from FavouredNode's Node Group
Date Tue, 22 Sep 2015 11:48:04 GMT

    [ https://issues.apache.org/jira/browse/HDFS-9044?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14902436#comment-14902436
] 

Hadoop QA commented on HDFS-9044:
---------------------------------

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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 33s | 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 46s | There were no new javac warning messages. |
| {color:green}+1{color} | javadoc |  10m  1s | There were no new javadoc warning messages.
|
| {color:green}+1{color} | release audit |   0m 23s | The applied patch does not increase
the total number of release audit warnings. |
| {color:red}-1{color} | checkstyle |   1m 19s | The applied patch generated  2 new checkstyle
issues (total was 50, now 51). |
| {color:green}+1{color} | whitespace |   0m  0s | The patch has no lines that end in whitespace.
|
| {color:green}+1{color} | install |   1m 28s | mvn install still works. |
| {color:green}+1{color} | eclipse:eclipse |   0m 34s | The patch built with eclipse:eclipse.
|
| {color:green}+1{color} | findbugs |   2m 26s | The patch does not introduce any new Findbugs
(version 3.0.0) warnings. |
| {color:green}+1{color} | native |   3m 15s | Pre-build of native portion |
| {color:red}-1{color} | hdfs tests | 163m 11s | Tests failed in hadoop-hdfs. |
| | | 208m  0s | |
\\
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|| Reason || Tests ||
| Failed unit tests | hadoop.hdfs.TestDFSClientRetries |
|   | hadoop.hdfs.server.namenode.TestFSNamesystem |
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|| Subsystem || Report/Notes ||
| Patch URL | http://issues.apache.org/jira/secure/attachment/12761595/HDFS-9044.3.patch |
| Optional Tests | javadoc javac unit findbugs checkstyle |
| git revision | trunk / 10ab7d5 |
| checkstyle |  https://builds.apache.org/job/PreCommit-HDFS-Build/12584/artifact/patchprocess/diffcheckstylehadoop-hdfs.txt
|
| hadoop-hdfs test log | https://builds.apache.org/job/PreCommit-HDFS-Build/12584/artifact/patchprocess/testrun_hadoop-hdfs.txt
|
| Test Results | https://builds.apache.org/job/PreCommit-HDFS-Build/12584/testReport/ |
| Java | 1.7.0_55 |
| uname | Linux asf903.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/12584/console |


This message was automatically generated.

> Give Priority to FavouredNodes , before selecting nodes from FavouredNode's Node Group
> --------------------------------------------------------------------------------------
>
>                 Key: HDFS-9044
>                 URL: https://issues.apache.org/jira/browse/HDFS-9044
>             Project: Hadoop HDFS
>          Issue Type: Bug
>            Reporter: J.Andreina
>            Assignee: J.Andreina
>         Attachments: HDFS-9044.1.patch, HDFS-9044.2.patch, HDFS-9044.3.patch
>
>
> Passing Favored nodes intention is to place replica among the favored node
> Current behavior in Node group is 
> 	If favored node is not available it goes to one among favored nodegroup. 
> {noformat}
> Say for example:
> 	1)I need 3 replicas and passed 5 favored nodes.
> 	2)Out of 5 favored nodes 3 favored nodes are not good.
> 	3)Then based on BlockPlacementPolicyWithNodeGroup out of 5 targets node returned , 3
will be random node from 3 bad FavoredNode's nodegroup. 
> 	4)Then there is a probability that all my 3 replicas are placed on Random node from
FavoredNodes's nodegroup , instead of giving priority to 2 favored nodes returned as target.
> {noformat}
> *Instead of returning 5 targets on 3rd step above , we can return 2 good favored nodes
as target*
> *And remaining 1 needed replica can be chosen from Random node of bad FavoredNodes's
nodegroup.*
> This will make sure that the FavoredNodes are given priority.



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