[HBASE-9080] Retain assignment should be used when re-enabling table(s)

• Type: Bug
• Status: Closed
• Priority: Critical
• Resolution: Fixed
• Affects Version/s: 0.94.10
• Fix Version/s: 0.94.11
• Hadoop Flags: Reviewed

Release Note

To achieve good data locality, retain assignment is used when re-enabling tables.

hbase.master.enabletable.roundrobin is no longer effective.

• Assignee: Ted Yu
• Reporter: Ted Yu
• Created: 30/Jul/13 01:11
• Updated: 26/Oct/13 01:53
• Resolved: 30/Jul/13 20:28

Description

Region servers are picked in round robin fashion when a table is re-enabled.

This results in poor data locality.

We should use retain assignment when re-enabling table(s).

For initial discussion, see HBASE-6143
Since patches for 0.94 and trunk may turn out to be very different, this JIRA is for fixing the issue in 0.94 branch.

Thanks Lars, Elliot, Vladmir and Stack for providing opinions on this subject.

Issue Links

• relates to: HBASE-6143 Make region assignment smarter when regions are re-enabled.