Attila Turoczy created HIVE-29811:
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Summary: HS2 slow start in Kubernetes
Key: HIVE-29811
URL: https://issues.apache.org/jira/browse/HIVE-29811
Project: Hive
Issue Type: Improvement
Components: HiveServer2
Reporter: Attila Turoczy
HiveServer2 is slow and cold-start time is dominated by JVM class loading of
the large *Hive/Hadoop/Tez/Calcite* class graph. Every process start re-parses
and verifies thousands of classes from jars. The base-JDK CDS archive (enabled
by \{{-Xshare:auto}}) covers only JDK classes. Hive/Hadoop/Tez/Calcite
application classes are NOT archived, so they are re-loaded from jars every
time.
AI Recommendation:
_AppCDS commonly reduces combined JVM + application startup by roughly 20–40%
for large class graphs by memory-mapping pre-parsed class metadata instead of
re-reading jars. The exact figure for HS2 should be confirmed with the
reproduction above on a reference image; the point of the ticket is to make
that win available and documented out of the box._
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