Todd Lipcon created KUDU-2366:
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Summary: LockManager consumes significant memory
Key: KUDU-2366
URL: https://issues.apache.org/jira/browse/KUDU-2366
Project: Kudu
Issue Type: Improvement
Components: tablet
Affects Versions: 1.7.0
Reporter: Todd Lipcon
Assignee: Todd Lipcon
Looking at a heap dump of a server that's been running for a while with an
ingest workload across multiple tables, I see the LockManager is using about
200MB of RAM. The workload in this case has batches of about 30,000 rows each,
so while each batch is in flight the LockManager hashtable has that many locks
in it. That causes it to expand to the next higher power of two (64k slots).
Each slot takes 16 bytes, so the lock table is reaching about 1MB. We never
resize _down_, so even once the tablet becomes cold, it still uses 1M of
unrecoverable RAM for the rest of the tserver lifetime.
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