use of alluxio.master.journal.JournalOutputStream in project alluxio by Alluxio.
the class InodeTreeTest method verifyJournal.
// helper for verifying that correct objects were journaled to the output stream
private static void verifyJournal(InodeTree root, List<Inode<?>> journaled) throws Exception {
JournalOutputStream mockOutputStream = Mockito.mock(JournalOutputStream.class);
root.streamToJournalCheckpoint(mockOutputStream);
for (Inode<?> node : journaled) {
Mockito.verify(mockOutputStream).writeEntry(node.toJournalEntry());
}
Mockito.verifyNoMoreInteractions(mockOutputStream);
}
use of alluxio.master.journal.JournalOutputStream in project alluxio by Alluxio.
the class AbstractMaster method start.
@Override
public void start(boolean isLeader) throws IOException {
Preconditions.checkState(mExecutorService == null);
mExecutorService = mExecutorServiceFactory.create();
mIsLeader = isLeader;
LOG.info("{}: Starting {} master.", getName(), mIsLeader ? "leader" : "standby");
if (mIsLeader) {
Preconditions.checkState(mJournal instanceof ReadWriteJournal);
mJournalWriter = ((ReadWriteJournal) mJournal).getNewWriter();
/**
* The sequence for dealing with the journal before starting as the leader:
*
* Phase 1. Recover from a backup checkpoint if the last startup failed while writing the
* checkpoint.
*
* Phase 2. Mark all the logs as completed. Since this master is the leader, it is allowed to
* write the journal, so it can mark the current log as completed. After this step, the
* current log file will not exist, and all logs will be complete.
*
* Phase 3. Reconstruct the state from the journal. This uses the JournalTailer to process all
* of the checkpoint and the complete log files. Since all logs are complete, after this step,
* the master will reflect the state of all of the journal entries.
*
* Phase 4. Write out the checkpoint file. Since this master is completely up-to-date, it
* writes out the checkpoint file. When the checkpoint file is closed, it will then delete the
* complete log files.
*
* Since this method is called before the master RPC server starts serving, there is no
* concurrent access to the master during these phases.
*/
// Phase 1: Recover from a backup checkpoint if necessary.
mJournalWriter.recoverCheckpoint();
// Phase 2: Mark all logs as complete, including the current log. After this call, the current
// log should not exist, and all the log files will be complete.
mJournalWriter.completeAllLogs();
// Phase 3: Replay all the state of the checkpoint and the completed log files.
JournalTailer catchupTailer;
if (mStandbyJournalTailer != null && mStandbyJournalTailer.getLatestJournalTailer() != null && mStandbyJournalTailer.getLatestJournalTailer().isValid()) {
// This master was previously in standby mode, and processed some of the journal. Re-use the
// same tailer (still valid) to continue processing any remaining journal entries.
LOG.info("{}: finish processing remaining journal entries (standby -> master).", getName());
catchupTailer = mStandbyJournalTailer.getLatestJournalTailer();
catchupTailer.processNextJournalLogFiles();
} else {
// This master has not successfully processed any of the journal, so create a fresh tailer
// to process the entire journal.
catchupTailer = new JournalTailer(this, mJournal);
if (catchupTailer.checkpointExists()) {
LOG.info("{}: process entire journal before becoming leader master.", getName());
catchupTailer.processJournalCheckpoint(true);
catchupTailer.processNextJournalLogFiles();
} else {
LOG.info("{}: journal checkpoint does not exist, nothing to process.", getName());
}
}
long latestSequenceNumber = catchupTailer.getLatestSequenceNumber();
// Phase 4: initialize the journal and write out the checkpoint file (the state of all
// completed logs).
JournalOutputStream checkpointStream = mJournalWriter.getCheckpointOutputStream(latestSequenceNumber);
LOG.info("{}: start writing checkpoint.", getName());
streamToJournalCheckpoint(checkpointStream);
checkpointStream.close();
LOG.info("{}: done with writing checkpoint.", getName());
mAsyncJournalWriter = new AsyncJournalWriter(mJournalWriter);
} else {
// This master is in standby mode. Start the journal tailer thread. Since the master is in
// standby mode, its RPC server is NOT serving. Therefore, the only thread modifying the
// master is this journal tailer thread (no concurrent access).
mStandbyJournalTailer = new JournalTailerThread(this, mJournal);
mStandbyJournalTailer.start();
}
}
use of alluxio.master.journal.JournalOutputStream in project alluxio by Alluxio.
the class LineageStoreTest method journalEntrySerialization.
/**
* Tests the {@link LineageStore#streamToJournalCheckpoint(JournalOutputStream)} method.
*/
@Test
public void journalEntrySerialization() throws Exception {
long l1 = mLineageStore.createLineage(new ArrayList<Long>(), Lists.newArrayList(1L), mJob);
long l2 = mLineageStore.createLineage(Lists.newArrayList(1L), Lists.newArrayList(2L), mJob);
JournalOutputStream outputStream = Mockito.mock(JournalOutputStream.class);
mLineageStore.streamToJournalCheckpoint(outputStream);
Mockito.verify(outputStream).writeEntry(mLineageStore.getLineage(l1).toJournalEntry());
Mockito.verify(outputStream).writeEntry(mLineageStore.getLineage(l2).toJournalEntry());
}
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