Virag Kothari created HBASE-11740:
-------------------------------------
Summary: RegionStates.getRegionAssignments() gets stuck on clone
Key: HBASE-11740
URL: https://issues.apache.org/jira/browse/HBASE-11740
Project: HBase
Issue Type: Bug
Components: Region Assignment
Reporter: Virag Kothari
Assignee: Virag Kothari
This happens in processDeadServersAndRegionsInTransition() on Master startup.
RegionAssigments is a tree map and TreeMap.clone() is expensive as it builds a
tree from sorted data (O(n)). There were a million entries in RegionAssigments
and from jstack, thread was stuck in TreeMap.buildFromSorted() for couple of
hours.
Instead of this shadow clone, wrapping as an unmodifiable Map should be enough.
--
This message was sent by Atlassian JIRA
(v6.2#6252)
