Sergey Shelukhin created HIVE-18837:
---------------------------------------
Summary: add a flag and disable some object pools in LLAP until
further testing
Key: HIVE-18837
URL: https://issues.apache.org/jira/browse/HIVE-18837
Project: Hive
Issue Type: Bug
Reporter: Sergey Shelukhin
Assignee: Sergey Shelukhin
There appears to be some subtle concurrency issue in FixedSizedObjectPool that
happens with multiple consumers where some object may be retrieved twice.
Unfortunately running a load test for hour(s) does not trigger it for me and
overall it happens extremely rarely on non-specific tests; adding debug info at
this level is a little bit difficult to determine how it could have happened
and interlocked operations in the trace may actually eliminate the issue. I
suspect it has something to do with aggressive assumptions made for locking and
array elements and the memory model. Maybe that can be simplified without much
perf loss.
Anyway, for now we will disable the pools where multiple consumers use them.
Need to test perf to see if these two pools even matter; if so, we can simplify
the model as per above or debug the issue in some way.
--
This message was sent by Atlassian JIRA
(v7.6.3#76005)
