[jira] [Created] (HIVE-21642) Hive server leaks memory on data insertion

["Alexander Knopov (JIRA)" <ji...@apache.org>]

Alexander Knopov created HIVE-21642:
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             Summary: 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


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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