[HBASE-10089] Metrics intern table names cause eventual permgen OOM in 0.94

• Type: Bug
• Status: Closed
• Priority: Minor
• Resolution: Fixed
• Affects Version/s: 0.94.0, 0.94.14
• Fix Version/s: 0.94.15
• Hadoop Flags: Reviewed
• Assignee: Ted Yu
• Reporter: Dave Latham
• Created: 05/Dec/13 19:31
• Updated: 30/May/14 17:23
• Resolved: 13/Dec/13 21:42

Description

As part of the metrics system introduced in HBASE-4768 there are two places that hbase uses String interning ( SchemaConfigured and SchemaMetrics ). This includes interning table names. We have long running environment where we run regular integration tests on our application using hbase. Those tests create and drop tables with new names regularly. These leads to filling up the permgen with interned table names. Workaround is to periodically restart the region servers.

Issue Links

• is related to: HBASE-11267 Dynamic metrics2 metrics may consume large amount of heap memory