/** Initiate the shutdown of this tailer thread, and also wait for it to finish. */
public void shutdownAndJoin() {
shutdown();
try {
// Wait for the thread to finish.
join();
} catch (InterruptedException ie) {
LOG.warn(
"{}: stopping the journal tailer caused exception: {}",
mMaster.getServiceName(),
ie.getMessage());
}
}
@Override
public void run() {
LOG.info("{}: Journal tailer started.", mMaster.getServiceName());
// Continually loop loading the checkpoint file, and then loading all completed files. The loop
// only repeats when the checkpoint file is updated after it was read.
while (!mInitiateShutdown) {
try {
// The start time (ms) for the initiated shutdown.
long waitForShutdownStart = -1;
// Load the checkpoint file.
LOG.info("{}: Waiting to load the checkpoint file.", mMaster.getServiceName());
mJournalTailer = new JournalTailer(mMaster, mJournal);
while (!mJournalTailer.checkpointExists()) {
CommonUtils.sleepMs(LOG, mJournalTailerSleepTimeMs);
if (mInitiateShutdown) {
LOG.info("Journal tailer has been shutdown while waiting to load the checkpoint file.");
mStopped = true;
return;
}
}
LOG.info("{}: Start loading the checkpoint file.", mMaster.getServiceName());
mJournalTailer.processJournalCheckpoint(true);
LOG.info("{}: Checkpoint file has been loaded.", mMaster.getServiceName());
// Continually process completed log files.
while (mJournalTailer.isValid()) {
if (mJournalTailer.processNextJournalLogFiles() > 0) {
// Reset the shutdown timer.
waitForShutdownStart = -1;
} else {
if (mInitiateShutdown) {
if (waitForShutdownStart == -1) {
waitForShutdownStart = CommonUtils.getCurrentMs();
} else if ((CommonUtils.getCurrentMs() - waitForShutdownStart)
> mShutdownQuietWaitTimeMs) {
// There have been no new logs for the quiet period. Shutdown now.
LOG.info(
"{}: Journal tailer has been shutdown. No new logs for the quiet period.",
mMaster.getServiceName());
mStopped = true;
return;
}
}
LOG.debug(
"{}: The next complete log file does not exist yet. "
+ "Sleeping and checking again.",
mMaster.getServiceName());
CommonUtils.sleepMs(LOG, mJournalTailerSleepTimeMs);
}
}
LOG.info(
"{}: The checkpoint is out of date. Will reload the checkpoint file.",
mMaster.getServiceName());
CommonUtils.sleepMs(LOG, mJournalTailerSleepTimeMs);
} catch (IOException ioe) {
// Log the error and continue the loop.
LOG.error(ioe.getMessage());
}
}
LOG.info("{}: Journal tailer has been shutdown.", mMaster.getServiceName());
mStopped = true;
}
/** Initiate the shutdown of this tailer thread. */
public void shutdown() {
LOG.info("{}: Journal tailer shutdown has been initiated.", mMaster.getServiceName());
mInitiateShutdown = true;
}