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From "Hadoop QA (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-10966) Enhance Dispatcher logic on deciding when to give up a source DataNode
Date Sat, 19 Nov 2016 01:38:58 GMT

    [ https://issues.apache.org/jira/browse/HDFS-10966?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15678337#comment-15678337
] 

Hadoop QA commented on HDFS-10966:
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| (/) *{color:green}+1 overall{color}* |
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|| Vote || Subsystem || Runtime || Comment ||
| {color:blue}0{color} | {color:blue} reexec {color} | {color:blue}  0m 13s{color} | {color:blue}
Docker mode activated. {color} |
| {color:green}+1{color} | {color:green} @author {color} | {color:green}  0m  0s{color} |
{color:green} The patch does not contain any @author tags. {color} |
| {color:green}+1{color} | {color:green} test4tests {color} | {color:green}  0m  0s{color}
| {color:green} The patch appears to include 1 new or modified test files. {color} |
| {color:green}+1{color} | {color:green} mvninstall {color} | {color:green}  6m 52s{color}
| {color:green} trunk passed {color} |
| {color:green}+1{color} | {color:green} compile {color} | {color:green}  0m 44s{color} |
{color:green} trunk passed {color} |
| {color:green}+1{color} | {color:green} checkstyle {color} | {color:green}  0m 34s{color}
| {color:green} trunk passed {color} |
| {color:green}+1{color} | {color:green} mvnsite {color} | {color:green}  0m 52s{color} |
{color:green} trunk passed {color} |
| {color:green}+1{color} | {color:green} mvneclipse {color} | {color:green}  0m 12s{color}
| {color:green} trunk passed {color} |
| {color:green}+1{color} | {color:green} findbugs {color} | {color:green}  1m 39s{color} |
{color:green} trunk passed {color} |
| {color:green}+1{color} | {color:green} javadoc {color} | {color:green}  0m 39s{color} |
{color:green} trunk passed {color} |
| {color:green}+1{color} | {color:green} mvninstall {color} | {color:green}  0m 44s{color}
| {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} compile {color} | {color:green}  0m 42s{color} |
{color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} javac {color} | {color:green}  0m 42s{color} | {color:green}
the patch passed {color} |
| {color:orange}-0{color} | {color:orange} checkstyle {color} | {color:orange}  0m 31s{color}
| {color:orange} hadoop-hdfs-project/hadoop-hdfs: The patch generated 6 new + 693 unchanged
- 3 fixed = 699 total (was 696) {color} |
| {color:green}+1{color} | {color:green} mvnsite {color} | {color:green}  0m 49s{color} |
{color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} mvneclipse {color} | {color:green}  0m  9s{color}
| {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} whitespace {color} | {color:green}  0m  0s{color}
| {color:green} The patch has no whitespace issues. {color} |
| {color:green}+1{color} | {color:green} xml {color} | {color:green}  0m  2s{color} | {color:green}
The patch has no ill-formed XML file. {color} |
| {color:green}+1{color} | {color:green} findbugs {color} | {color:green}  1m 46s{color} |
{color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} javadoc {color} | {color:green}  0m 36s{color} |
{color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} unit {color} | {color:green} 61m  6s{color} | {color:green}
hadoop-hdfs in the patch passed. {color} |
| {color:green}+1{color} | {color:green} asflicense {color} | {color:green}  0m 18s{color}
| {color:green} The patch does not generate ASF License warnings. {color} |
| {color:black}{color} | {color:black} {color} | {color:black} 79m 42s{color} | {color:black}
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|| Subsystem || Report/Notes ||
| Docker |  Image:yetus/hadoop:a9ad5d6 |
| JIRA Issue | HDFS-10966 |
| JIRA Patch URL | https://issues.apache.org/jira/secure/attachment/12839654/HDFS-10966.01.patch
|
| Optional Tests |  asflicense  compile  javac  javadoc  mvninstall  mvnsite  unit  findbugs
 checkstyle  xml  |
| uname | Linux 8ba1d89a341b 3.13.0-93-generic #140-Ubuntu SMP Mon Jul 18 21:21:05 UTC 2016
x86_64 x86_64 x86_64 GNU/Linux |
| Build tool | maven |
| Personality | /testptch/hadoop/patchprocess/precommit/personality/provided.sh |
| git revision | trunk / 7584fbf |
| Default Java | 1.8.0_111 |
| findbugs | v3.0.0 |
| checkstyle | https://builds.apache.org/job/PreCommit-HDFS-Build/17613/artifact/patchprocess/diff-checkstyle-hadoop-hdfs-project_hadoop-hdfs.txt
|
|  Test Results | https://builds.apache.org/job/PreCommit-HDFS-Build/17613/testReport/ |
| modules | C: hadoop-hdfs-project/hadoop-hdfs U: hadoop-hdfs-project/hadoop-hdfs |
| Console output | https://builds.apache.org/job/PreCommit-HDFS-Build/17613/console |
| Powered by | Apache Yetus 0.4.0-SNAPSHOT   http://yetus.apache.org |


This message was automatically generated.



> Enhance Dispatcher logic on deciding when to give up a source DataNode
> ----------------------------------------------------------------------
>
>                 Key: HDFS-10966
>                 URL: https://issues.apache.org/jira/browse/HDFS-10966
>             Project: Hadoop HDFS
>          Issue Type: Bug
>          Components: balancer & mover
>            Reporter: Zhe Zhang
>            Assignee: Mark Wagner
>         Attachments: HDFS-10966.00.patch, HDFS-10966.01.patch
>
>
> When a {{Dispatcher}} thread works on a source DataNode, in each iteration it tries to
execute a {{PendingMove}}. If no block is moved after 5 iterations, this source (over-utlized)
DataNode is given up for this Balancer iteration (20 mins). This is problematic if the source
DataNode was heavily loaded in the beginning of the iteration. It will quickly encounter 5
unsuccessful moves and be abandoned.
> We should enhance this logic by e.g. using elapsed time instead of number of iterations.
> {code}
> // Check if the previous move was successful
>         } else {
>           // source node cannot find a pending block to move, iteration +1
>           noPendingMoveIteration++;
>           // in case no blocks can be moved for source node's task,
>           // jump out of while-loop after 5 iterations.
>           if (noPendingMoveIteration >= MAX_NO_PENDING_MOVE_ITERATIONS) {
>             LOG.info("Failed to find a pending move "  + noPendingMoveIteration
>                 + " times.  Skipping " + this);
>             resetScheduledSize();
>           }
>         }
> {code}



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