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https://issues.apache.org/jira/browse/YARN-10975?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17441137#comment-17441137
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Prabhu Joseph commented on YARN-10975:
--------------------------------------
The main issue is in the below code which returns 0 always. Every time the file
is processed, the offset is set to 0 and next time it starts processing from 0.
{code}
bytesParsed = parser.getCurrentLocation().getCharOffset() + 1;
LOG.trace("Parser now at offset {}", bytesParsed);
{code}
> EntityGroupFSTimelineStore#ActiveLogParser parses already processed files
> --------------------------------------------------------------------------
>
> Key: YARN-10975
> URL: https://issues.apache.org/jira/browse/YARN-10975
> Project: Hadoop YARN
> Issue Type: Bug
> Components: timelineserver
> Affects Versions: 3.3.0
> Reporter: Prabhu Joseph
> Assignee: Ravuri Sushma sree
> Priority: Major
>
> EntityGroupFSTimelineStore#ActiveLogParser parses already processed files
> again and again even though there is no change in the file. This leads to
> unnecessary load on DFS where summary files resides and Timeline Store where
> timeline entities present.
> {code}
> 2021-10-10 19:20:43,940 INFO timeline.LogInfo - Parsed 6 entities from
> hdfs:/prabhuJoseph/atshistory/active/application_1631559260564_0009/appattempt_1631559260564_0009_000001/summarylog-appattempt_1631559260564_0009_000001_2331123893
> in 275 msec
> 2021-10-10 19:21:44,079 INFO timeline.LogInfo - Parsed 6 entities from
> hdfs:/prabhuJoseph/atshistory/active/application_1631559260564_0009/appattempt_1631559260564_0009_000001/summarylog-appattempt_1631559260564_0009_000001_2331123893
> in 341 msec
> 2021-10-10 19:22:44,065 INFO timeline.LogInfo - Parsed 6 entities from
> hdfs:/prabhuJoseph/atshistory/active/application_1631559260564_0009/appattempt_1631559260564_0009_000001/summarylog-appattempt_1631559260564_0009_000001_2331123893
> in 335 msec
> 2021-10-10 19:23:44,038 INFO timeline.LogInfo - Parsed 6 entities from
> hdfs:/prabhuJoseph/atshistory/active/application_1631559260564_0009/appattempt_1631559260564_0009_000001/summarylog-appattempt_1631559260564_0009_000001_2331123893
> in 370 msec
> 2021-10-10 19:24:44,087 INFO timeline.LogInfo - Parsed 6 entities from
> hdfs:/prabhuJoseph/atshistory/active/application_1631559260564_0009/appattempt_1631559260564_0009_000001/summarylog-appattempt_1631559260564_0009_000001_2331123893
> in 317 msec
> 2021-10-10 19:25:44,092 INFO timeline.LogInfo - Parsed 6 entities from
> hdfs:/prabhuJoseph/atshistory/active/application_1631559260564_0009/appattempt_1631559260564_0009_000001/summarylog-appattempt_1631559260564_0009_000001_2331123893
> in 336 msec
> {code}
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