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java.lang.Objectorg.apache.hadoop.hbase.regionserver.RegionMergeTransaction
@InterfaceAudience.Private public class RegionMergeTransaction
Executes region merge as a "transaction". It is similar with
SplitTransaction. Call prepare(RegionServerServices)
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:
RegionMergeTransaction mt = new RegionMergeTransaction(this.conf, parent, midKey) if (!mt.prepare(services)) return; try { mt.execute(server, services); } catch (IOException ioe) { try { mt.rollback(server, services); return; } catch (RuntimeException e) { myAbortable.abort("Failed merge, abort"); } }
This class is not thread safe. Caller needs ensure merge is run by one thread only.
Constructor Summary | |
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RegionMergeTransaction(HRegion a,
HRegion b,
boolean forcible)
Constructor |
Method Summary | |
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HRegion |
execute(Server server,
RegionServerServices services)
Run the transaction. |
static HRegionInfo |
getMergedRegionInfo(HRegionInfo a,
HRegionInfo b)
Get merged region info through the specified two regions |
boolean |
prepare(RegionServerServices services)
Does checks on merge inputs. |
boolean |
rollback(Server server,
RegionServerServices services)
|
Methods inherited from class java.lang.Object |
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clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
Constructor Detail |
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public RegionMergeTransaction(HRegion a, HRegion b, boolean forcible)
a
- region a to mergeb
- region b to mergeforcible
- if false, we will only merge adjacent regionsMethod Detail |
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public boolean prepare(RegionServerServices services)
services
-
true
if the regions are mergeable else
false
if they are not (e.g. its already closed, etc.).public 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 static HRegionInfo getMergedRegionInfo(HRegionInfo a, HRegionInfo b)
a
- merging region Ab
- merging region B
public boolean rollback(Server server, RegionServerServices services) throws IOException
server
- Hosting server instance (May be null when testing).services
- Services of regionserver, used to online regions.
IOException
- If thrown, rollback failed. Take drastic action.
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