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Hitesh Shah updated TEZ-1491: ----------------------------- Target Version/s: 0.7.1 (was: 0.7.0) > Tez reducer-side merge's counter update is slow > ----------------------------------------------- > > Key: TEZ-1491 > URL: https://issues.apache.org/jira/browse/TEZ-1491 > Project: Apache Tez > Issue Type: Bug > Affects Versions: 0.6.0 > Reporter: Gopal V > Assignee: Gopal V > Attachments: perf-top-counters.png > > > TezMerger$MergeQueue::next() shows up in profiles due a synchronized block in > a tight loop. > Part of the slow operation was due to DataInputBuffer issues identified > earlier in HADOOP-10694, but along with that approx 11% of my lock prefix > calls were originating from the following line. > {code} > mergeProgress.set(totalBytesProcessed * progPerByte); > {code} > in two places within the core loop. > !perf-top-counters.png! -- This message was sent by Atlassian JIRA (v6.3.4#6332)