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https://issues.apache.org/jira/browse/HDFS-12200?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17162200#comment-17162200
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Hadoop QA commented on HDFS-12200:
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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
45s{color} | {color:blue} Docker mode activated. {color} |
|| || || || {color:brown} Prechecks {color} ||
| {color:green}+1{color} | {color:green} dupname {color} | {color:green} 0m
0s{color} | {color:green} No case conflicting files found. {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:brown} trunk Compile Tests {color} ||
| {color:blue}0{color} | {color:blue} mvndep {color} | {color:blue} 3m
24s{color} | {color:blue} Maven dependency ordering for branch {color} |
| {color:green}+1{color} | {color:green} mvninstall {color} | {color:green} 26m
42s{color} | {color:green} trunk passed {color} |
| {color:green}+1{color} | {color:green} compile {color} | {color:green} 17m
53s{color} | {color:green} trunk passed {color} |
| {color:green}+1{color} | {color:green} checkstyle {color} | {color:green} 2m
53s{color} | {color:green} trunk passed {color} |
| {color:green}+1{color} | {color:green} mvnsite {color} | {color:green} 3m
1s{color} | {color:green} trunk passed {color} |
| {color:green}+1{color} | {color:green} shadedclient {color} | {color:green}
20m 14s{color} | {color:green} branch has no errors when building and testing
our client artifacts. {color} |
| {color:green}+1{color} | {color:green} javadoc {color} | {color:green} 1m
58s{color} | {color:green} trunk passed {color} |
| {color:blue}0{color} | {color:blue} spotbugs {color} | {color:blue} 3m
16s{color} | {color:blue} Used deprecated FindBugs config; considering
switching to SpotBugs. {color} |
| {color:red}-1{color} | {color:red} findbugs {color} | {color:red} 2m
23s{color} | {color:red} hadoop-common-project/hadoop-common in trunk has 2
extant findbugs warnings. {color} |
| {color:red}-1{color} | {color:red} findbugs {color} | {color:red} 3m
13s{color} | {color:red} hadoop-hdfs-project/hadoop-hdfs in trunk has 4 extant
findbugs warnings. {color} |
|| || || || {color:brown} Patch Compile Tests {color} ||
| {color:blue}0{color} | {color:blue} mvndep {color} | {color:blue} 0m
27s{color} | {color:blue} Maven dependency ordering for patch {color} |
| {color:green}+1{color} | {color:green} mvninstall {color} | {color:green} 2m
4s{color} | {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} compile {color} | {color:green} 17m
47s{color} | {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} javac {color} | {color:green} 17m
47s{color} | {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} checkstyle {color} | {color:green} 2m
50s{color} | {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} mvnsite {color} | {color:green} 2m
55s{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
1s{color} | {color:green} The patch has no ill-formed XML file. {color} |
| {color:red}-1{color} | {color:red} shadedclient {color} | {color:red} 14m
0s{color} | {color:red} patch has errors when building and testing our client
artifacts. {color} |
| {color:green}+1{color} | {color:green} javadoc {color} | {color:green} 2m
1s{color} | {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} findbugs {color} | {color:green} 5m
54s{color} | {color:green} the patch passed {color} |
|| || || || {color:brown} Other Tests {color} ||
| {color:green}+1{color} | {color:green} unit {color} | {color:green} 9m
39s{color} | {color:green} hadoop-common in the patch passed. {color} |
| {color:red}-1{color} | {color:red} unit {color} | {color:red} 96m 55s{color}
| {color:red} hadoop-hdfs in the patch passed. {color} |
| {color:green}+1{color} | {color:green} asflicense {color} | {color:green} 1m
5s{color} | {color:green} The patch does not generate ASF License warnings.
{color} |
| {color:black}{color} | {color:black} {color} | {color:black}235m 4s{color} |
{color:black} {color} |
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|| Reason || Tests ||
| Failed junit tests | hadoop.tools.TestHdfsConfigFields |
| | hadoop.fs.contract.hdfs.TestHDFSContractMultipartUploader |
| | hadoop.hdfs.server.blockmanagement.TestBlockTokenWithDFSStriped |
| | hadoop.hdfs.server.namenode.TestNameNodeRetryCacheMetrics |
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|| Subsystem || Report/Notes ||
| Docker | ClientAPI=1.40 ServerAPI=1.40 base:
https://builds.apache.org/job/PreCommit-HDFS-Build/29538/artifact/out/Dockerfile
|
| JIRA Issue | HDFS-12200 |
| JIRA Patch URL |
https://issues.apache.org/jira/secure/attachment/12879096/HDFS-12200-003.patch |
| Optional Tests | dupname asflicense compile javac javadoc mvninstall mvnsite
unit shadedclient findbugs checkstyle xml |
| uname | Linux fafc5864412f 4.15.0-58-generic #64-Ubuntu SMP Tue Aug 6
11:12:41 UTC 2019 x86_64 x86_64 x86_64 GNU/Linux |
| Build tool | maven |
| Personality | personality/hadoop.sh |
| git revision | trunk / d57462f2dae |
| Default Java | Private Build-1.8.0_252-8u252-b09-1~18.04-b09 |
| findbugs |
https://builds.apache.org/job/PreCommit-HDFS-Build/29538/artifact/out/branch-findbugs-hadoop-common-project_hadoop-common-warnings.html
|
| findbugs |
https://builds.apache.org/job/PreCommit-HDFS-Build/29538/artifact/out/branch-findbugs-hadoop-hdfs-project_hadoop-hdfs-warnings.html
|
| unit |
https://builds.apache.org/job/PreCommit-HDFS-Build/29538/artifact/out/patch-unit-hadoop-hdfs-project_hadoop-hdfs.txt
|
| Test Results |
https://builds.apache.org/job/PreCommit-HDFS-Build/29538/testReport/ |
| Max. process+thread count | 4546 (vs. ulimit of 5500) |
| modules | C: hadoop-common-project/hadoop-common
hadoop-hdfs-project/hadoop-hdfs U: . |
| Console output |
https://builds.apache.org/job/PreCommit-HDFS-Build/29538/console |
| versions | git=2.17.1 maven=3.6.0 findbugs=4.0.6 |
| Powered by | Apache Yetus 0.12.0 https://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
> Assignee: Jiandan Yang
> Priority: Major
> Attachments: HDFS-12200-001.patch, HDFS-12200-002.patch,
> HDFS-12200-003.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 in
> writing journalNode timeout, eventually leading to NameNode hang up. The
> reason is offline tasks running in a few hundred servers access HDFS at the
> same time, NameNode resolve rack of client machine, started several hundreds
> to two thousand sub-process.
> {code:java}
> "process reaper"#10864 daemon prio=10 os_prio=0 tid=0x00007fe270a31800
> nid=0x38d93 runnable [0x00007fcdc36fc000]
> java.lang.Thread.State: RUNNABLE
> at java.lang.UNIXProcess.waitForProcessExit(Native Method)
> at java.lang.UNIXProcess.lambda$initStreams$4(UNIXProcess.java:301)
> at java.lang.UNIXProcess$$Lambda$7/1447689627.run(Unknown Source)
> at
> java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1147)
> at
> java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:622)
> at java.lang.Thread.run(Thread.java:834
> {code}
> Our configuration as follows:
> {code:java}
> net.topology.node.switch.mapping.impl = ScriptBasedMapping,
> net.topology.script.file.name = 'a python script'
> {code}
> 2. Optimization
> In order to solve these two problems, we have optimized the
> CachedDNSToSwitchMapping
> (1) Added the DataNode IP list to the file of dfs.hosts configured. when
> NameNode starts it preloads DataNode rack information to the cache, get a
> batch of racks of hosts when running script once (the corresponding
> configuration is net.topology.script.number,the default value of 100)
> (2) Step (1) has ensured that the cache has all the DataNodes’ rack, so if
> the cache did not hit, then the host must be a client machine, then directly
> return /default-rack,
> (3) Each time you add new DataNodes you need to add the new DataNodes’ 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’ rack into cache
> (4) Add new configuration items dfs.namenode.topology.resolve-non-cache-host,
> the value is false to open the above function, and the value is true to turn
> off the above functions, default value is true to keep compatibility
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