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https://issues.apache.org/jira/browse/HIVE-18269?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Sergey Shelukhin reassigned HIVE-18269:
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Assignee: Sergey Shelukhin (was: Prasanth Jayachandran)
> LLAP: Fast llap io with slow processing pipeline can lead to OOM
> ----------------------------------------------------------------
>
> Key: HIVE-18269
> URL: https://issues.apache.org/jira/browse/HIVE-18269
> Project: Hive
> Issue Type: Bug
> Affects Versions: 3.0.0
> Reporter: Prasanth Jayachandran
> Assignee: Sergey Shelukhin
> Attachments: HIVE-18269.1.patch, Screen Shot 2017-12-13 at 1.15.16
> AM.png
>
>
> pendingData linked list in Llap IO elevator (LlapRecordReader.java) may grow
> indefinitely when Llap IO is faster than processing pipeline. Since we don't
> have backpressure to slow down the IO, this can lead to indefinite growth of
> pending data leading to severe GC pressure and eventually lead to OOM.
> This specific instance of LLAP was running on HDFS on top of EBS volume
> backed by SSD. The query that triggered this is issue was ANALYZE STATISTICS
> .. FOR COLUMNS which also gather bitvectors. Fast IO and Slow processing case.
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