[HBASE-4010] HMaster.createTable could be heavily optimized

• Type: Improvement
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 0.90.3
• Fix Version/s: 0.92.0
• Hadoop Flags: Reviewed
• Assignee: Ted Yu
• Reporter: Jean-Daniel Cryans
• Created: 20/Jun/11 22:08
• Updated: 20/Nov/15 11:52
• Resolved: 24/Jun/11 15:43

Description

Looking at the createTable method in HMaster (the one that's private), we seem to be very inefficient:

• We set the enabled flag for the table for every region (should be done only once).
• Every time we create a new region we create a new HLog and then close it (reuse one instead or see if it's really necessary).
• We do one RPC to .META. per region (we should batch put).

This should provide drastic speedups even for those creating tables with just 50 regions.

Issue Links

• is depended upon by: HBASE-4021 Further parallelize HMaster.createTable()
• relates to: HBASE-3229 Table creation, though using "async" call to master, can actually run for a while and cause RPC timeout