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From "Hadoop QA (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HADOOP-14033) Reduce fair call queue lock contention
Date Thu, 09 Feb 2017 18:09:41 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-14033?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15859929#comment-15859929
] 

Hadoop QA commented on HADOOP-14033:
------------------------------------

| (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 19s{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: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:green}+1{color} | {color:green} mvninstall {color} | {color:green} 13m  0s{color}
| {color:green} trunk passed {color} |
| {color:green}+1{color} | {color:green} compile {color} | {color:green} 14m 33s{color} |
{color:green} trunk passed {color} |
| {color:green}+1{color} | {color:green} checkstyle {color} | {color:green}  0m 30s{color}
| {color:green} trunk passed {color} |
| {color:green}+1{color} | {color:green} mvnsite {color} | {color:green}  1m 10s{color} |
{color:green} trunk passed {color} |
| {color:green}+1{color} | {color:green} mvneclipse {color} | {color:green}  0m 17s{color}
| {color:green} trunk passed {color} |
| {color:green}+1{color} | {color:green} findbugs {color} | {color:green}  1m 42s{color} |
{color:green} trunk passed {color} |
| {color:green}+1{color} | {color:green} javadoc {color} | {color:green}  0m 50s{color} |
{color:green} trunk passed {color} |
| {color:green}+1{color} | {color:green} mvninstall {color} | {color:green}  0m 46s{color}
| {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} compile {color} | {color:green} 12m 37s{color} |
{color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} javac {color} | {color:green} 12m 37s{color} | {color:green}
the patch passed {color} |
| {color:green}+1{color} | {color:green} checkstyle {color} | {color:green}  0m 30s{color}
| {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} mvnsite {color} | {color:green}  1m  8s{color} |
{color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} mvneclipse {color} | {color:green}  0m 17s{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}  1m 43s{color} |
{color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} javadoc {color} | {color:green}  0m 47s{color} |
{color:green} the patch passed {color} |
| {color:red}-1{color} | {color:red} unit {color} | {color:red}  8m 22s{color} | {color:red}
hadoop-common in the patch failed. {color} |
| {color:green}+1{color} | {color:green} asflicense {color} | {color:green}  0m 34s{color}
| {color:green} The patch does not generate ASF License warnings. {color} |
| {color:black}{color} | {color:black} {color} | {color:black} 60m 52s{color} | {color:black}
{color} |
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|| Reason || Tests ||
| Failed junit tests | hadoop.security.TestKDiag |
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|| Subsystem || Report/Notes ||
| Docker |  Image:yetus/hadoop:a9ad5d6 |
| JIRA Issue | HADOOP-14033 |
| JIRA Patch URL | https://issues.apache.org/jira/secure/attachment/12850016/HADOOP-14033.patch
|
| Optional Tests |  asflicense  compile  javac  javadoc  mvninstall  mvnsite  unit  findbugs
 checkstyle  |
| uname | Linux c25d758d2f6b 3.13.0-106-generic #153-Ubuntu SMP Tue Dec 6 15:44:32 UTC 2016
x86_64 x86_64 x86_64 GNU/Linux |
| Build tool | maven |
| Personality | /testptch/hadoop/patchprocess/precommit/personality/provided.sh |
| git revision | trunk / b6bb99c |
| Default Java | 1.8.0_121 |
| findbugs | v3.0.0 |
| unit | https://builds.apache.org/job/PreCommit-HADOOP-Build/11602/artifact/patchprocess/patch-unit-hadoop-common-project_hadoop-common.txt
|
|  Test Results | https://builds.apache.org/job/PreCommit-HADOOP-Build/11602/testReport/ |
| modules | C: hadoop-common-project/hadoop-common U: hadoop-common-project/hadoop-common
|
| Console output | https://builds.apache.org/job/PreCommit-HADOOP-Build/11602/console |
| Powered by | Apache Yetus 0.5.0-SNAPSHOT   http://yetus.apache.org |


This message was automatically generated.



> Reduce fair call queue lock contention
> --------------------------------------
>
>                 Key: HADOOP-14033
>                 URL: https://issues.apache.org/jira/browse/HADOOP-14033
>             Project: Hadoop Common
>          Issue Type: Sub-task
>          Components: ipc
>    Affects Versions: 2.7.0
>            Reporter: Daryn Sharp
>            Assignee: Daryn Sharp
>         Attachments: HADOOP-14033.patch
>
>
> Under heavy load the call queue may run dry yet clients experience high latency.
> The fcq requires producers and consumers to sync via a shared lock.  Polling consumers
hold the lock while scanning all sub-queues.  Consumers are serialized despite the sub-queues
being thread-safe blocking queues.  The effect is to cause other producers/consumers to frequently
park.
> The lock is unfair, so producers/consumers attempt to barge in on the lock.  The outnumbered
producers tend to remain blocked for an extended time.  As load increases and the queues fill,
the barging consumers drain the queues faster than the producers can fill it.
> Server metrics provide an illusion of healthy throughput, response time, and call queue
length due to starvation on the ingress.   Often as the load gets worse, the server looks
better.



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