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Date: Wed, 11 Oct 2017 23:30:00 +0000 (UTC)
From: "Hadoop QA (JIRA)" <jira@apache.org>
To: hdfs-issues@hadoop.apache.org
Message-ID: <JIRA.13090136.1501058144000.34257.1507764600346@Atlassian.JIRA>
In-Reply-To: <JIRA.13090136.1501058144000@Atlassian.JIRA>
References: <JIRA.13090136.1501058144000@Atlassian.JIRA> <JIRA.13090136.1501058144746@jira-lw-us.apache.org>
Subject: [jira] [Commented] (HDFS-12200) Optimize CachedDNSToSwitchMapping
 to avoid 100% cpu utilization
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archived-at: Wed, 11 Oct 2017 23:30:07 -0000


    [ https://issues.apache.org/jira/browse/HDFS-12200?page=3Dcom.atlassian=
.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=3D1620=
1192#comment-16201192 ]=20

Hadoop QA commented on HDFS-12200:
----------------------------------

| (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 23s=
{color} | {color:blue} Docker mode activated. {color} |
|| || || || {color:brown} Prechecks {color} ||
| {color:green}+1{color} | {color:green} @author {color} | {color:green}  0=
m  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 modif=
ied test files. {color} |
|| || || || {color:brown} trunk Compile Tests {color} ||
| {color:blue}0{color} | {color:blue} mvndep {color} | {color:blue}  0m 15s=
{color} | {color:blue} Maven dependency ordering for branch {color} |
| {color:green}+1{color} | {color:green} mvninstall {color} | {color:green}=
 14m 22s{color} | {color:green} trunk passed {color} |
| {color:green}+1{color} | {color:green} compile {color} | {color:green} 15=
m 35s{color} | {color:green} trunk passed {color} |
| {color:green}+1{color} | {color:green} checkstyle {color} | {color:green}=
  2m  8s{color} | {color:green} trunk passed {color} |
| {color:green}+1{color} | {color:green} mvnsite {color} | {color:green}  2=
m 20s{color} | {color:green} trunk passed {color} |
| {color:green}+1{color} | {color:green} shadedclient {color} | {color:gree=
n} 13m 10s{color} | {color:green} branch has no errors when building and te=
sting our client artifacts. {color} |
| {color:green}+1{color} | {color:green} findbugs {color} | {color:green}  =
3m 45s{color} | {color:green} trunk passed {color} |
| {color:green}+1{color} | {color:green} javadoc {color} | {color:green}  1=
m 52s{color} | {color:green} trunk passed {color} |
|| || || || {color:brown} Patch Compile Tests {color} ||
| {color:blue}0{color} | {color:blue} mvndep {color} | {color:blue}  0m 16s=
{color} | {color:blue} Maven dependency ordering for patch {color} |
| {color:green}+1{color} | {color:green} mvninstall {color} | {color:green}=
  1m 44s{color} | {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} compile {color} | {color:green} 12=
m 27s{color} | {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} javac {color} | {color:green} 12m =
27s{color} | {color:green} the patch passed {color} |
| {color:orange}-0{color} | {color:orange} checkstyle {color} | {color:oran=
ge}  2m 13s{color} | {color:orange} root: The patch generated 1 new + 456 u=
nchanged - 0 fixed =3D 457 total (was 456) {color} |
| {color:green}+1{color} | {color:green} mvnsite {color} | {color:green}  2=
m 15s{color} | {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} whitespace {color} | {color:green}=
  0m  1s{color} | {color:green} The patch has no whitespace issues. {color}=
 |
| {color:green}+1{color} | {color:green} xml {color} | {color:green}  0m  1=
s{color} | {color:green} The patch has no ill-formed XML file. {color} |
| {color:red}-1{color} | {color:red} shadedclient {color} | {color:red}  8m=
 51s{color} | {color:red} patch has errors when building and testing our cl=
ient artifacts. {color} |
| {color:green}+1{color} | {color:green} findbugs {color} | {color:green}  =
3m 50s{color} | {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} javadoc {color} | {color:green}  1=
m 48s{color} | {color:green} the patch passed {color} |
|| || || || {color:brown} Other Tests {color} ||
| {color:green}+1{color} | {color:green} unit {color} | {color:green}  8m 4=
1s{color} | {color:green} hadoop-common in the patch passed. {color} |
| {color:red}-1{color} | {color:red} unit {color} | {color:red} 94m 53s{col=
or} | {color:red} hadoop-hdfs in the patch failed. {color} |
| {color:green}+1{color} | {color:green} asflicense {color} | {color:green}=
  0m 45s{color} | {color:green} The patch does not generate ASF License war=
nings. {color} |
| {color:black}{color} | {color:black} {color} | {color:black}188m 27s{colo=
r} | {color:black} {color} |
\\
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|| Reason || Tests ||
| Failed junit tests | hadoop.hdfs.server.datanode.TestDataNodeVolumeFailur=
eReporting |
|   | hadoop.hdfs.server.namenode.ha.TestDNFencingWithReplication |
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\\
|| Subsystem || Report/Notes ||
| Docker |  Image:yetus/hadoop:3d04c00 |
| JIRA Issue | HDFS-12200 |
| JIRA Patch URL | https://issues.apache.org/jira/secure/attachment/1287909=
6/HDFS-12200-003.patch |
| Optional Tests |  asflicense  compile  javac  javadoc  mvninstall  mvnsit=
e  unit  shadedclient  findbugs  checkstyle  xml  |
| uname | Linux 3aed150cd705 3.13.0-129-generic #178-Ubuntu SMP Fri Aug 11 =
12:48:20 UTC 2017 x86_64 x86_64 x86_64 GNU/Linux |
| Build tool | maven |
| Personality | /testptch/hadoop/patchprocess/precommit/personality/provide=
d.sh |
| git revision | trunk / 8acdf5c |
| Default Java | 1.8.0_144 |
| findbugs | v3.1.0-RC1 |
| checkstyle | https://builds.apache.org/job/PreCommit-HDFS-Build/21654/art=
ifact/patchprocess/diff-checkstyle-root.txt |
| unit | https://builds.apache.org/job/PreCommit-HDFS-Build/21654/artifact/=
patchprocess/patch-unit-hadoop-hdfs-project_hadoop-hdfs.txt |
|  Test Results | https://builds.apache.org/job/PreCommit-HDFS-Build/21654/=
testReport/ |
| modules | C: hadoop-common-project/hadoop-common hadoop-hdfs-project/hado=
op-hdfs U: . |
| Console output | https://builds.apache.org/job/PreCommit-HDFS-Build/21654=
/console |
| Powered by | Apache Yetus 0.6.0-SNAPSHOT   http://yetus.apache.org |


This message was automatically generated.


> Optimize CachedDNSToSwitchMapping to avoid 100% cpu utilization
> ---------------------------------------------------------------
>
>                 Key: HDFS-12200
>                 URL: https://issues.apache.org/jira/browse/HDFS-12200
>             Project: Hadoop HDFS
>          Issue Type: Improvement
>          Components: namenode
>            Reporter: Jiandan Yang=20
>            Assignee: Jiandan Yang=20
>         Attachments: HDFS-12200-001.patch, HDFS-12200-002.patch, HDFS-122=
00-003.patch, cpu_ utilization.png, nn_thread_num.png
>
>
> 1. Background :
> Our hadoop cluster is disaggregated storage and compute, HDFS is deployed=
 to 600+ machines, YARN is deployed to another machine pool.
> We found that sometimes NameNode cpu utilization rate of 90% or even 100%=
. The most serious is cpu utilization rate of 100% for a long time result i=
n writing journalNode timeout, eventually leading to NameNode hang up. The =
reason is  offline tasks running in a few hundred servers access HDFS at th=
e same time, NameNode resolve rack of client machine, started several hundr=
eds to two thousand  sub-process.=20
> {code:java}
> "process reaper"#10864 daemon prio=3D10 os_prio=3D0 tid=3D0x00007fe270a31=
800 nid=3D0x38d93 runnable [0x00007fcdc36fc000]
>    java.lang.Thread.State: RUNNABLE
>         at java.lang.UNIXProcess.waitForProcessExit(Native Method)
>         at java.lang.UNIXProcess.lambda$initStreams$4(UNIXProcess.java:30=
1)
>         at java.lang.UNIXProcess$$Lambda$7/1447689627.run(Unknown Source)
>         at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolEx=
ecutor.java:1147)
>         at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolE=
xecutor.java:622)
>         at java.lang.Thread.run(Thread.java:834
> {code}
> Our configuration as follows:
> {code:java}
> net.topology.node.switch.mapping.impl =3D ScriptBasedMapping,=20
> net.topology.script.file.name =3D 'a python script'
> {code}
> 2. Optimization
> In order to solve these two problems, we have optimized the CachedDNSToSw=
itchMapping
> (1) Added the DataNode IP list  to the file of  dfs.hosts configured. whe=
n NameNode starts it  preloads DataNode rack information to the cache, get =
a batch of racks of hosts when running script once (the corresponding confi=
guration is net.topology.script.number,the default value of 100)
> (2) Step (1) has ensured that the cache has all the DataNodes=E2=80=99 ra=
ck,  so if the cache did not hit, then the host must be a client machine, t=
hen directly return /default-rack,
> (3) Each time you add new DataNodes you need to add the new DataNodes=E2=
=80=99 IP address to the file specified by dfs.hosts, and then run command =
of bin/hdfs dfsadmin -refreshNodes, it will put the newly added DataNodes=
=E2=80=99 rack into cache
> (4) Add new configuration items dfs.namenode.topology.resolve-non-cache-h=
ost, the value is false to open the above function, and the value is true t=
o turn off the above functions, default value is true to keep compatibility


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