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HBASE-16844 Procedure V2: DispatchMergingRegionsProcedure to use base class StateMachineProcedure for abort and rollback (Stephen Yuan Jiang)

This commit is contained in:
Stephen Yuan Jiang 2016-10-14 14:09:35 -07:00
parent 62c84115ec
commit b972839ca1
2 changed files with 14 additions and 13 deletions
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2
hbase-client/src/main/java/org/apache/hadoop/hbase/client/Admin.java
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@ -915,7 +915,7 @@ public interface Admin extends Abortable, Closeable {
* two adjacent regions
* @throws IOException
*/
public Future<Void> mergeRegionsAsync(
Future<Void> mergeRegionsAsync(
final byte[] nameOfRegionA,
final byte[] nameOfRegionB,
final boolean forcible) throws IOException;

25
hbase-server/src/main/java/org/apache/hadoop/hbase/master/procedure/DispatchMergingRegionsProcedure.java
View File

@ -153,13 +153,13 @@ public class DispatchMergingRegionsProcedure
try {
switch (state) {
case DISPATCH_MERGING_REGIONS_POST_OPERATION:
break; // nothing to rollback
case DISPATCH_MERGING_REGIONS_DO_MERGE_IN_RS:
String msg = this + " We are in the " + state + " state."
+ " It is complicated to rollback the merge operation that region server is working on."
+ " Rollback is not supported and we should let the merge operation to complete";
LOG.warn(msg);
break;
// PONR
throw new UnsupportedOperationException(this + " unhandled state=" + state);
case DISPATCH_MERGING_REGIONS_MOVE_REGION_TO_SAME_RS:
break; // nothing to rollback
case DISPATCH_MERGING_REGIONS_PRE_OPERATION:
@ -193,18 +193,19 @@ public class DispatchMergingRegionsProcedure
return DispatchMergingRegionsState.DISPATCH_MERGING_REGIONS_PREPARE;
}
/*
* Check whether we are in the state that can be rollback
*/
@Override
protected void setNextState(DispatchMergingRegionsState state) {
if (aborted.get()) {
setAbortFailure("merge-table-regions", "abort requested");
} else {
super.setNextState(state);
protected boolean isRollbackSupported(final DispatchMergingRegionsState state) {
switch (state) {
case DISPATCH_MERGING_REGIONS_POST_OPERATION:
case DISPATCH_MERGING_REGIONS_DO_MERGE_IN_RS:
// It is not safe to rollback if we reach to these states.
return false;
default:
break;
}
}
@Override
public boolean abort(final MasterProcedureEnv env) {
aborted.set(true);
return true;
}