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From "Hadoop QA (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-12137) DN dataset lock should be fair
Date Thu, 13 Jul 2017 22:23:00 GMT

    [ https://issues.apache.org/jira/browse/HDFS-12137?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16086519#comment-16086519
] 

Hadoop QA commented on HDFS-12137:
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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 21s{color} | {color:blue}
Docker mode activated. {color} |
|| || || || {color:brown} Prechecks {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:red}-1{color} | {color:red} test4tests {color} | {color:red}  0m  0s{color} | {color:red}
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} |
|| || || || {color:brown} branch-2 Compile Tests {color} ||
| {color:green}+1{color} | {color:green} mvninstall {color} | {color:green}  7m 44s{color}
| {color:green} branch-2 passed {color} |
| {color:green}+1{color} | {color:green} compile {color} | {color:green}  0m 48s{color} |
{color:green} branch-2 passed with JDK v1.8.0_131 {color} |
| {color:green}+1{color} | {color:green} compile {color} | {color:green}  0m 49s{color} |
{color:green} branch-2 passed with JDK v1.7.0_131 {color} |
| {color:green}+1{color} | {color:green} checkstyle {color} | {color:green}  0m 31s{color}
| {color:green} branch-2 passed {color} |
| {color:green}+1{color} | {color:green} mvnsite {color} | {color:green}  0m 59s{color} |
{color:green} branch-2 passed {color} |
| {color:green}+1{color} | {color:green} findbugs {color} | {color:green}  2m 14s{color} |
{color:green} branch-2 passed {color} |
| {color:green}+1{color} | {color:green} javadoc {color} | {color:green}  0m 40s{color} |
{color:green} branch-2 passed with JDK v1.8.0_131 {color} |
| {color:green}+1{color} | {color:green} javadoc {color} | {color:green}  1m  5s{color} |
{color:green} branch-2 passed with JDK v1.7.0_131 {color} |
|| || || || {color:brown} Patch Compile Tests {color} ||
| {color:green}+1{color} | {color:green} mvninstall {color} | {color:green}  0m 48s{color}
| {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} compile {color} | {color:green}  0m 43s{color} |
{color:green} the patch passed with JDK v1.8.0_131 {color} |
| {color:green}+1{color} | {color:green} javac {color} | {color:green}  0m 43s{color} | {color:green}
the patch passed {color} |
| {color:green}+1{color} | {color:green} compile {color} | {color:green}  0m 47s{color} |
{color:green} the patch passed with JDK v1.7.0_131 {color} |
| {color:green}+1{color} | {color:green} javac {color} | {color:green}  0m 47s{color} | {color:green}
the patch passed {color} |
| {color:green}+1{color} | {color:green} checkstyle {color} | {color:green}  0m 27s{color}
| {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} mvnsite {color} | {color:green}  0m 52s{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}  2m 19s{color} |
{color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} javadoc {color} | {color:green}  0m 39s{color} |
{color:green} the patch passed with JDK v1.8.0_131 {color} |
| {color:green}+1{color} | {color:green} javadoc {color} | {color:green}  1m  3s{color} |
{color:green} the patch passed with JDK v1.7.0_131 {color} |
|| || || || {color:brown} Other Tests {color} ||
| {color:red}-1{color} | {color:red} unit {color} | {color:red} 50m 45s{color} | {color:red}
hadoop-hdfs in the patch failed with JDK v1.7.0_131. {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}133m 58s{color} | {color:black}
{color} |
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|| Reason || Tests ||
| JDK v1.8.0_131 Failed junit tests | hadoop.hdfs.TestEncryptionZones |
|   | hadoop.hdfs.server.namenode.TestDecommissioningStatus |
| JDK v1.7.0_131 Failed junit tests | hadoop.hdfs.server.blockmanagement.TestReplicationPolicyWithUpgradeDomain
|
|   | hadoop.hdfs.server.balancer.TestBalancerRPCDelay |
|   | hadoop.hdfs.TestEncryptionZonesWithKMS |
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|| Subsystem || Report/Notes ||
| Docker |  Image:yetus/hadoop:5e40efe |
| JIRA Issue | HDFS-12137 |
| JIRA Patch URL | https://issues.apache.org/jira/secure/attachment/12877150/HDFS-12137.branch-2.patch
|
| Optional Tests |  asflicense  compile  javac  javadoc  mvninstall  mvnsite  unit  findbugs
 checkstyle  |
| uname | Linux fec2734037db 3.13.0-116-generic #163-Ubuntu SMP Fri Mar 31 14:13:22 UTC 2017
x86_64 x86_64 x86_64 GNU/Linux |
| Build tool | maven |
| Personality | /testptch/hadoop/patchprocess/precommit/personality/provided.sh |
| git revision | branch-2 / d83e871 |
| Default Java | 1.7.0_131 |
| Multi-JDK versions |  /usr/lib/jvm/java-8-oracle:1.8.0_131 /usr/lib/jvm/java-7-openjdk-amd64:1.7.0_131
|
| findbugs | v3.0.0 |
| unit | https://builds.apache.org/job/PreCommit-HDFS-Build/20264/artifact/patchprocess/patch-unit-hadoop-hdfs-project_hadoop-hdfs-jdk1.7.0_131.txt
|
| JDK v1.7.0_131  Test Results | https://builds.apache.org/job/PreCommit-HDFS-Build/20264/testReport/
|
| modules | C: hadoop-hdfs-project/hadoop-hdfs U: hadoop-hdfs-project/hadoop-hdfs |
| Console output | https://builds.apache.org/job/PreCommit-HDFS-Build/20264/console |
| Powered by | Apache Yetus 0.6.0-SNAPSHOT   http://yetus.apache.org |


This message was automatically generated.



> DN dataset lock should be fair
> ------------------------------
>
>                 Key: HDFS-12137
>                 URL: https://issues.apache.org/jira/browse/HDFS-12137
>             Project: Hadoop HDFS
>          Issue Type: Improvement
>          Components: datanode
>    Affects Versions: 2.8.0
>            Reporter: Daryn Sharp
>            Assignee: Daryn Sharp
>            Priority: Critical
>         Attachments: HDFS-12137.branch-2.patch, HDFS-12137.trunk.patch
>
>
> The dataset lock is very highly contended.  The unfair nature can be especially harmful
to the heartbeat handling.  Under high loads, partially expose by HDFS-12136 introducing disk
i/o within the lock, the heartbeat handling thread may process commands so slowly due to the
contention that the node becomes stale or falsely declared dead.  The unfair lock is not helping
and appears to be causing frequent starvation under load.



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