} catch (final Exception e) {
LOG.error("Exception caught while redoing transactions. Aborting recovery to avoid possible damage. " +
"Before starting again, make sure to run a check via the emergency export tool.", e);
if (next != null)
{LOG.info("Log entry that caused the exception: " + next.dump());}
throw new LogException("Recovery aborted. ");
} finally {
LOG.info("Redo processed " + redoCnt + " out of " + txnCount + " transactions.");
}
// ------- UNDO ---------
if (LOG.isInfoEnabled())
{LOG.info("Second pass: undoing dirty transactions. Uncommitted transactions: " +
runningTxns.size());}
// see if there are uncommitted transactions pending
if (runningTxns.size() > 0) {
// do a reverse scan of the log, undoing all uncommitted transactions
try {
while((next = reader.previousEntry()) != null) {
if (next.getLogType() == LogEntryTypes.TXN_START) {
if (runningTxns.get(next.getTransactionId()) != null) {
runningTxns.remove(next.getTransactionId());
if (runningTxns.size() == 0)
// all dirty transactions undone
{break;}
}
} else if (next.getLogType() == LogEntryTypes.TXN_COMMIT) {
// ignore already committed transaction
} else if (next.getLogType() == LogEntryTypes.CHECKPOINT) {
// found last checkpoint: undo is completed
break;
}
// undo the log entry if it belongs to an uncommitted transaction
if (runningTxns.get(next.getTransactionId()) != null) {
// LOG.debug("Undo: " + next.dump());
next.undo();
}
}
} catch (final Exception e) {
LOG.warn("Exception caught while undoing dirty transactions. Remaining transactions " +
"to be undone: " + runningTxns.size() + ". Aborting recovery to avoid possible damage. " +
"Before starting again, make sure to run a check via the emergency export tool.", e);
if (next != null)
{LOG.warn("Log entry that caused the exception: " + next.dump());}
throw new LogException("Recovery aborted");
}
}
} finally {
broker.sync(Sync.MAJOR_SYNC);
logManager.setInRecovery(false);