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https://issues.apache.org/jira/browse/HIVE-21642?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16823524#comment-16823524
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Gopal V commented on HIVE-21642:
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This does not leak memory on Hive master anymore, I recommend opening a ticket
with EMR for 2.3.x branch fixes.
> Hive server leaks memory on data insertion
> ------------------------------------------
>
> Key: HIVE-21642
> URL: https://issues.apache.org/jira/browse/HIVE-21642
> Project: Hive
> Issue Type: Bug
> Components: HiveServer2
> Affects Versions: 2.3.4
> Environment: * Amazon Hadoop Distribution emr-5.20.0
> * Master mode with 4 CPU and 16 GB RAM each
> * Table files stored in S3 cloud storage
> Reporter: Alexander Knopov
> Priority: Major
>
> We are continuously loading data into Hive table stored in ORC format by
> appending data in batches. We repeatedly have seen that over a span of few
> days Hive server experience {{OutOfMemoryError}} exceptions that we believe
> are caused by memory leaks.
> Comparing heap dumps shows that most suspicious classes that show persistent
> growth are and not recycled with GC are
> * {{org.apache.hadoop.hive.ql.io.orc.OrcStruct$Field}}
> *
> {{org.apache.hadoop.hive.serde2.objectinspector.UnionStructObjectInspector$MyField}}
> * {{String}}
> Sample program used for stress test and heap dumps from 700 to 2500 GB can be
> uploaded on request. They are too big for Jira backing store
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