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https://issues.apache.org/jira/browse/MAPREDUCE-7309?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Peter Bacsko updated MAPREDUCE-7309:
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|| Subsystem || Report/Notes ||
| Docker | ClientAPI=1.40 ServerAPI=1.40 base:
https://ci-hadoop.apache.org/job/PreCommit-MAPREDUCE-Build/41/artifact/out/Dockerfile
|
| JIRA Issue | MAPREDUCE-7309 |
| JIRA Patch URL |
https://issues.apache.org/jira/secure/attachment/13015953/MAPREDUCE-7309-branch-3.1-001.patch
|
| Optional Tests | dupname asflicense compile javac javadoc mvninstall mvnsite
unit shadedclient findbugs checkstyle codespell |
| uname | Linux 67dcc5808d36 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 | branch-3.1 / 4638ed94dbf20e65293e675222e7bdaeb141b68a |
| Default Java | Private Build-1.8.0_275-8u275-b01-0ubuntu1~16.04-b01 |
| Test Results |
https://ci-hadoop.apache.org/job/PreCommit-MAPREDUCE-Build/41/testReport/ |
| Max. process+thread count | 93 (vs. ulimit of 5500) |
| modules | C:
hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-app U:
hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-app |
| Console output |
https://ci-hadoop.apache.org/job/PreCommit-MAPREDUCE-Build/41/console |
| versions | git=2.7.4 maven=3.3.9 |
| Powered by | Apache Yetus 0.14.0-SNAPSHOT https://yetus.apache.org |
This message was automatically generated.
)
> Improve performance of reading resource request for mapper/reducers from
> config
> -------------------------------------------------------------------------------
>
> Key: MAPREDUCE-7309
> URL: https://issues.apache.org/jira/browse/MAPREDUCE-7309
> Project: Hadoop Map/Reduce
> Issue Type: Improvement
> Components: applicationmaster
> Affects Versions: 3.0.0, 3.1.0, 3.2.0, 3.3.0
> Reporter: Wangda Tan
> Assignee: Peter Bacsko
> Priority: Major
> Fix For: 3.4.0
>
> Attachments: MAPREDUCE-7309-003.patch, MAPREDUCE-7309-004.patch,
> MAPREDUCE-7309-005.patch, MAPREDUCE-7309-branch-3.1-001.patch,
> MAPREDUCE-7309-branch-3.2-001.patch, MAPREDUCE-7309-branch-3.3-001.patch,
> MAPREDUCE-7309.001.patch, MAPREDUCE-7309.002.patch
>
>
> This is an issue could affect all the releases which includes YARN-6927.
> Basically, we use regex match repeatedly when we read mapper/reducer resource
> request from config files. When we have large config file, and large number
> of splits, it could take a long time.
> We saw AM could take hours to parse config when we have 200k+ splits, with a
> large config file (hundreds of kbs).
> The problamtic part is this:
> {noformat}
> private void populateResourceCapability(TaskType taskType) {
> String resourceTypePrefix =
> getResourceTypePrefix(taskType);
> boolean memorySet = false;
> boolean cpuVcoresSet = false;
> if (resourceTypePrefix != null) {
> List<ResourceInformation> resourceRequests =
> ResourceUtils.getRequestedResourcesFromConfig(conf,
> resourceTypePrefix);
> {noformat}
> Inside {{ResourceUtils.getRequestedResourcesFromConfig()}}, we call
> {{Configuration.getValByRegex()}} which goes through all property keys that
> come from the MapReduce job configuration (jobconf.xml). If the job config is
> large (eg. due to being part of an MR pipeline and it was populated by an
> earlier job), then this results in running a regexp match unnecessarily for
> all properties over and over again. This is not necessary, because all
> mappers and reducers will have the same config, respectively.
> We should do proper caching for pre-configured resource requests.
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