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From "Hadoop QA (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-12044) Mismatch between BlockManager#maxReplicationStreams and ErasureCodingWorker.stripedReconstructionPool pool size causes slow and bursty recovery
Date Sat, 01 Jul 2017 08:05:01 GMT

    [ https://issues.apache.org/jira/browse/HDFS-12044?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16071095#comment-16071095
] 

Hadoop QA commented on HDFS-12044:
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| (x) *{color:red}-1 overall{color}* |
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|| Vote || Subsystem || Runtime || Comment ||
| {color:blue}0{color} | {color:blue} reexec {color} | {color:blue}  0m 20s{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:blue}0{color} | {color:blue} mvndep {color} | {color:blue}  0m 23s{color} | {color:blue}
Maven dependency ordering for branch {color} |
| {color:green}+1{color} | {color:green} mvninstall {color} | {color:green} 13m 22s{color}
| {color:green} trunk passed {color} |
| {color:green}+1{color} | {color:green} compile {color} | {color:green}  1m 29s{color} |
{color:green} trunk passed {color} |
| {color:green}+1{color} | {color:green} checkstyle {color} | {color:green}  0m 39s{color}
| {color:green} trunk passed {color} |
| {color:green}+1{color} | {color:green} mvnsite {color} | {color:green}  1m 34s{color} |
{color:green} trunk passed {color} |
| {color:red}-1{color} | {color:red} findbugs {color} | {color:red}  1m 30s{color} | {color:red}
hadoop-hdfs-project/hadoop-hdfs-client in trunk has 2 extant Findbugs warnings. {color} |
| {color:red}-1{color} | {color:red} findbugs {color} | {color:red}  1m 42s{color} | {color:red}
hadoop-hdfs-project/hadoop-hdfs in trunk has 10 extant Findbugs warnings. {color} |
| {color:green}+1{color} | {color:green} javadoc {color} | {color:green}  0m 58s{color} |
{color:green} trunk passed {color} |
| {color:blue}0{color} | {color:blue} mvndep {color} | {color:blue}  0m  7s{color} | {color:blue}
Maven dependency ordering for patch {color} |
| {color:green}+1{color} | {color:green} mvninstall {color} | {color:green}  1m 21s{color}
| {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} compile {color} | {color:green}  1m 26s{color} |
{color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} javac {color} | {color:green}  1m 26s{color} | {color:green}
the patch passed {color} |
| {color:orange}-0{color} | {color:orange} checkstyle {color} | {color:orange}  0m 39s{color}
| {color:orange} hadoop-hdfs-project: The patch generated 1 new + 184 unchanged - 0 fixed
= 185 total (was 184) {color} |
| {color:green}+1{color} | {color:green} mvnsite {color} | {color:green}  1m 26s{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} findbugs {color} | {color:green}  3m 22s{color} |
{color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} javadoc {color} | {color:green}  0m 57s{color} |
{color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} unit {color} | {color:green}  1m 16s{color} | {color:green}
hadoop-hdfs-client in the patch passed. {color} |
| {color:red}-1{color} | {color:red} unit {color} | {color:red} 81m 37s{color} | {color:red}
hadoop-hdfs in the patch failed. {color} |
| {color:green}+1{color} | {color:green} asflicense {color} | {color:green}  0m 20s{color}
| {color:green} The patch does not generate ASF License warnings. {color} |
| {color:black}{color} | {color:black} {color} | {color:black}115m 51s{color} | {color:black}
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|| Reason || Tests ||
| Failed junit tests | hadoop.hdfs.TestDFSStripedOutputStreamWithFailure080 |
|   | hadoop.hdfs.TestDFSStripedInputStreamWithRandomECPolicy |
|   | hadoop.hdfs.TestDFSStripedOutputStreamWithFailure070 |
|   | hadoop.hdfs.server.namenode.TestDecommissioningStatus |
|   | hadoop.hdfs.server.datanode.TestDataNodeVolumeFailureReporting |
|   | hadoop.hdfs.server.datanode.TestDataNodeHotSwapVolumes |
|   | hadoop.hdfs.web.TestWebHdfsTimeouts |
|   | hadoop.hdfs.TestFileChecksum |
| Timed out junit tests | org.apache.hadoop.hdfs.server.blockmanagement.TestBlockStatsMXBean
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|| Subsystem || Report/Notes ||
| Docker |  Image:yetus/hadoop:14b5c93 |
| JIRA Issue | HDFS-12044 |
| JIRA Patch URL | https://issues.apache.org/jira/secure/attachment/12875339/HDFS-12044.03.patch
|
| Optional Tests |  asflicense  compile  javac  javadoc  mvninstall  mvnsite  unit  findbugs
 checkstyle  |
| uname | Linux 6c831fdeb141 4.4.0-43-generic #63-Ubuntu SMP Wed Oct 12 13:48:03 UTC 2016
x86_64 x86_64 x86_64 GNU/Linux |
| Build tool | maven |
| Personality | /testptch/hadoop/patchprocess/precommit/personality/provided.sh |
| git revision | trunk / 147df30 |
| Default Java | 1.8.0_131 |
| findbugs | v3.1.0-RC1 |
| findbugs | https://builds.apache.org/job/PreCommit-HDFS-Build/20123/artifact/patchprocess/branch-findbugs-hadoop-hdfs-project_hadoop-hdfs-client-warnings.html
|
| findbugs | https://builds.apache.org/job/PreCommit-HDFS-Build/20123/artifact/patchprocess/branch-findbugs-hadoop-hdfs-project_hadoop-hdfs-warnings.html
|
| checkstyle | https://builds.apache.org/job/PreCommit-HDFS-Build/20123/artifact/patchprocess/diff-checkstyle-hadoop-hdfs-project.txt
|
| unit | https://builds.apache.org/job/PreCommit-HDFS-Build/20123/artifact/patchprocess/patch-unit-hadoop-hdfs-project_hadoop-hdfs.txt
|
|  Test Results | https://builds.apache.org/job/PreCommit-HDFS-Build/20123/testReport/ |
| modules | C: hadoop-hdfs-project/hadoop-hdfs-client hadoop-hdfs-project/hadoop-hdfs U: hadoop-hdfs-project
|
| Console output | https://builds.apache.org/job/PreCommit-HDFS-Build/20123/console |
| Powered by | Apache Yetus 0.5.0-SNAPSHOT   http://yetus.apache.org |


This message was automatically generated.



> Mismatch between BlockManager#maxReplicationStreams and ErasureCodingWorker.stripedReconstructionPool
pool size causes slow and bursty recovery
> -----------------------------------------------------------------------------------------------------------------------------------------------
>
>                 Key: HDFS-12044
>                 URL: https://issues.apache.org/jira/browse/HDFS-12044
>             Project: Hadoop HDFS
>          Issue Type: Bug
>          Components: erasure-coding
>    Affects Versions: 3.0.0-alpha3
>            Reporter: Lei (Eddy) Xu
>            Assignee: Lei (Eddy) Xu
>              Labels: hdfs-ec-3.0-must-do
>         Attachments: HDFS-12044.00.patch, HDFS-12044.01.patch, HDFS-12044.02.patch, HDFS-12044.03.patch
>
>
> {{ErasureCodingWorker#stripedReconstructionPool}} is with {{corePoolSize=2}} and {{maxPoolSize=8}}
as default. And it rejects more tasks if the queue is full.
> When {{BlockManager#maxReplicationStream}} is larger than {{ErasureCodingWorker#stripedReconstructionPool#corePoolSize/maxPoolSize}},
for example, {{maxReplicationStream=20}} and {{corePoolSize=2 , maxPoolSize=8}}.  Meanwhile,
NN sends up to {{maxTransfer}} reconstruction tasks to DN for each heartbeat, and it is calculated
in {{FSNamesystem}}:
> {code}
> final int maxTransfer = blockManager.getMaxReplicationStreams() - xmitsInProgress;
> {code}
> However, at any giving time, {{{ErasureCodingWorker#stripedReconstructionPool}} takes
2 {{xmitInProcess}}. So for each heartbeat in 3s, NN will send about {{20-2 = 18}} reconstruction
tasks to the DN, and DN throw away most of them if there were 8 tasks in the queue already.
So NN needs to take longer to re-consider these blocks were under-replicated to schedule new
tasks.



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