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Posted to issues@hive.apache.org by "Slim Bouguerra (Jira)" <ji...@apache.org> on 2019/11/05 19:21:00 UTC
[jira] [Work started] (HIVE-22446) Make IO decoding quantiles
counters less contended resource.
[ https://issues.apache.org/jira/browse/HIVE-22446?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Work on HIVE-22446 started by Slim Bouguerra.
---------------------------------------------
> Make IO decoding quantiles counters less contended resource.
> ------------------------------------------------------------
>
> Key: HIVE-22446
> URL: https://issues.apache.org/jira/browse/HIVE-22446
> Project: Hive
> Issue Type: Improvement
> Components: llap
> Reporter: Slim Bouguerra
> Assignee: Slim Bouguerra
> Priority: Major
> Fix For: 4.0.0
>
>
> Currently LLAP IO relies on Hadoop Lock-based quantiles data structure and updates the IO decoding sample on a per batch based using.
> {code}
> org.apache.hadoop.hive.llap.metrics.LlapDaemonIOMetrics#addDecodeBatchTime
> {code}
> via
> {code}
> org.apache.hadoop.hive.llap.io.decode.EncodedDataConsumer#consumeData
> {code}
> This can be a source of thread contention.
> Goal of this ticket is to reduce the frequency of updates to avoid major bottleneck.
>
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