/**
* Do the commit. This is the 2nd phase of the 2-phase protocol.
*
* @param transactionState
* @throws CommitUnsuccessfulException
*/
void doCommit(final TransactionState transactionState) throws CommitUnsuccessfulException {
try {
LOG.trace("Commiting [" + transactionState.getTransactionId() + "]");
transactionLogger.setStatusForTransaction(
transactionState.getTransactionId(), TransactionLogger.TransactionStatus.COMMITTED);
for (HRegionLocation location : transactionState.getParticipatingRegions()) {
if (transactionState.getRegionsToIngore().contains(location)) {
continue;
}
TransactionalRegionInterface transactionalRegionServer =
(TransactionalRegionInterface)
connection.getHRegionConnection(location.getServerAddress());
transactionalRegionServer.commit(
location.getRegionInfo().getRegionName(), transactionState.getTransactionId());
}
} catch (Exception e) {
LOG.info(
"Commit of transaction [" + transactionState.getTransactionId() + "] was unsucsessful",
e);
// This happens on a NSRE that is triggered by a split
try {
abort(transactionState);
} catch (Exception abortException) {
LOG.warn("Exeption durring abort", abortException);
}
throw new CommitUnsuccessfulException(e);
}
transactionLogger.forgetTransaction(transactionState.getTransactionId());
}
/**
* Abort a s transaction.
*
* @param transactionState
* @throws IOException
*/
public void abort(final TransactionState transactionState) throws IOException {
transactionLogger.setStatusForTransaction(
transactionState.getTransactionId(), TransactionLogger.TransactionStatus.ABORTED);
for (HRegionLocation location : transactionState.getParticipatingRegions()) {
if (transactionState.getRegionsToIngore().contains(location)) {
continue;
}
try {
TransactionalRegionInterface transactionalRegionServer =
(TransactionalRegionInterface)
connection.getHRegionConnection(location.getServerAddress());
transactionalRegionServer.abortTransaction(
location.getRegionInfo().getRegionName(), transactionState.getTransactionId());
} catch (UnknownTransactionException e) {
LOG.info(
"Got unknown transaciton exception durring abort. Transaction: ["
+ transactionState.getTransactionId()
+ "], region: ["
+ location.getRegionInfo().getRegionNameAsString()
+ "]. Ignoring.");
} catch (NotServingRegionException e) {
LOG.info(
"Got NSRE durring abort. Transaction: ["
+ transactionState.getTransactionId()
+ "], region: ["
+ location.getRegionInfo().getRegionNameAsString()
+ "]. Ignoring.");
}
}
transactionLogger.forgetTransaction(transactionState.getTransactionId());
}
@Override
protected long openScanner() throws IOException {
if (transactionState.addRegion(location)) {
((TransactionalRegionInterface) server)
.beginTransaction(
transactionState.getTransactionId(), location.getRegionInfo().getRegionName());
}
return ((TransactionalRegionInterface) server)
.openScanner(
transactionState.getTransactionId(),
this.location.getRegionInfo().getRegionName(),
getScan());
}
/**
* Prepare to commit a transaction.
*
* @param transactionState
* @return commitStatusCode (see {@link TransactionalRegionInterface})
* @throws IOException
* @throws CommitUnsuccessfulException
*/
public int prepareCommit(final TransactionState transactionState)
throws CommitUnsuccessfulException, IOException {
boolean allReadOnly = true;
try {
for (HRegionLocation location : transactionState.getParticipatingRegions()) {
TransactionalRegionInterface transactionalRegionServer =
(TransactionalRegionInterface)
connection.getHRegionConnection(location.getServerAddress());
int commitStatus =
transactionalRegionServer.commitRequest(
location.getRegionInfo().getRegionName(), transactionState.getTransactionId());
boolean canCommit = true;
switch (commitStatus) {
case TransactionalRegionInterface.COMMIT_OK:
allReadOnly = false;
break;
case TransactionalRegionInterface.COMMIT_OK_READ_ONLY:
transactionState.addRegionToIgnore(location); // No need to doCommit for read-onlys
break;
case TransactionalRegionInterface.COMMIT_UNSUCESSFUL:
canCommit = false;
transactionState.addRegionToIgnore(location); // No need to re-abort.
break;
default:
throw new CommitUnsuccessfulException(
"Unexpected return code from prepareCommit: " + commitStatus);
}
if (LOG.isTraceEnabled()) {
LOG.trace(
"Region ["
+ location.getRegionInfo().getRegionNameAsString()
+ "] votes "
+ (canCommit ? "to commit" : "to abort")
+ " transaction "
+ transactionState.getTransactionId());
}
if (!canCommit) {
LOG.debug("Aborting [" + transactionState.getTransactionId() + "]");
abort(transactionState);
return TransactionalRegionInterface.COMMIT_UNSUCESSFUL;
}
}
} catch (Exception e) {
LOG.debug(
"Commit of transaction [" + transactionState.getTransactionId() + "] was unsucsessful",
e);
// This happens on a NSRE that is triggered by a split
try {
abort(transactionState);
} catch (Exception abortException) {
LOG.warn("Exeption durring abort", abortException);
}
throw new CommitUnsuccessfulException(e);
}
return allReadOnly
? TransactionalRegionInterface.COMMIT_OK_READ_ONLY
: TransactionalRegionInterface.COMMIT_OK;
}