Batch Table Alter Operations
----------------------------
Key: HBASE-4358
URL: https://issues.apache.org/jira/browse/HBASE-4358
Project: HBase
Issue Type: Improvement
Components: ipc, master, shell
Affects Versions: 0.92.0
Reporter: Riley Patterson
Assignee: Riley Patterson
Priority: Minor
Currently, the RPC provides no way of asking for several table alterations at
once, and the master has no way of batch handling alter requests. Thus, when
the user requests several changes at the same time (i.e. add these I columns,
delete these J columns, and modify these K columns), each region is brought
down (I+J+K) times so that it can reflect the new schema. Additionally,
multiple writes are made to META, and multiple RPC calls must be made.
This patch provides batching for these operations, both at the RPC level and
within the Master's TableEventHandlers. This involves a bit of reorganization
in the TableEventHandler class hierarchy, and a new TableEventHandler,
TableMultiFamilyHandler. The net effect ends up being the difference seen here:
Before patch:
hbase(main):001:0> alter 'peeps', {NAME => 'rawr'}, {METHOD => 'delete', NAME
=> 'name'}
Updating all regions with the new schema...
1/1 regions updated.
Done.
Updating all regions with the new schema...
1/1 regions updated.
Done.
0 row(s) in 2.6450 seconds
After patch:
hbase(main):002:0> alter 'peeps', {NAME => 'rawr'}, {METHOD => 'delete', NAME
=> 'name'}
Updating all regions with the new schema...
1/1 regions updated.
Done.
0 row(s) in 1.1930 seconds
Regions are only brought down once, and the duration is cut 1/N.
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