slim bouguerra created HIVE-21686:
-------------------------------------
Summary: Brute Force eviction can lead to a random uncontrolled
eviction pattern.
Key: HIVE-21686
URL: https://issues.apache.org/jira/browse/HIVE-21686
Project: Hive
Issue Type: Bug
Reporter: slim bouguerra
Assignee: slim bouguerra
Current logic used by brute force eviction can lead to a perpetual random
eviction pattern.
For instance if the cache build a small pocket of free memory where the total
size is greater than incoming allocation request, the allocator will randomly
evict block that fits a particular size.
This can happen over and over therefore all the eviction will be random.
In Addition this random eviction will lead a leak in the linked list maintained
by the policy since it does not know anymore about what is evicted and what not.
--
This message was sent by Atlassian JIRA
(v7.6.3#76005)
