public class SplitTransaction extends Object
prepare()
to setup
the transaction, execute(Server, RegionServerServices)
to run the
transaction and rollback(Server, RegionServerServices)
to cleanup if execute fails.
Here is an example of how you would use this class:
SplitTransaction st = new SplitTransaction(this.conf, parent, midKey) if (!st.prepare()) return; try { st.execute(server, services); } catch (IOException ioe) { try { st.rollback(server, services); return; } catch (RuntimeException e) { myAbortable.abort("Failed split, abort"); } }
This class is not thread safe. Caller needs ensure split is run by one thread only.
Constructor and Description |
---|
SplitTransaction(HRegion r,
byte[] splitrow)
Constructor
|
Modifier and Type | Method and Description |
---|---|
PairOfSameType<HRegion> |
execute(Server server,
RegionServerServices services)
Run the transaction.
|
boolean |
prepare()
Does checks on split inputs.
|
boolean |
rollback(Server server,
RegionServerServices services) |
public SplitTransaction(HRegion r, byte[] splitrow)
r
- Region to splitsplitrow
- Row to split aroundpublic boolean prepare()
true
if the region is splittable else
false
if it is not (e.g. its already closed, etc.).public PairOfSameType<HRegion> execute(Server server, RegionServerServices services) throws IOException
server
- Hosting server instance. Can be null when testing (won't try
and update in zk if a null server)services
- Used to online/offline regions.IOException
- If thrown, transaction failed. Call rollback(Server, RegionServerServices)
IOException
rollback(Server, RegionServerServices)
public boolean rollback(Server server, RegionServerServices services) throws IOException
server
- Hosting server instance (May be null when testing).services
- IOException
- If thrown, rollback failed. Take drastic action.Copyright © 2014 The Apache Software Foundation. All Rights Reserved.