public boolean requiresInitialization(FileLock lock) {
if (!didRebuild) {
if (validator != null && !validator.isValid()) {
LOGGER.debug(
"Invalidating {} as cache validator return false.",
DefaultPersistentDirectoryCache.this);
return true;
}
}
if (!lock.getUnlockedCleanly()) {
if (!lock.getState().isInInitialState()) {
LOGGER.warn(
"Invalidating {} as it was not closed cleanly.",
DefaultPersistentDirectoryCache.this);
}
return true;
}
Properties cachedProperties = GUtil.loadProperties(propertiesFile);
for (Map.Entry<?, ?> entry : properties.entrySet()) {
String previousValue = cachedProperties.getProperty(entry.getKey().toString());
String currentValue = entry.getValue().toString();
if (!previousValue.equals(currentValue)) {
LOGGER.debug(
"Invalidating {} as cache property {} has changed from {} to {}.",
DefaultPersistentDirectoryCache.this,
entry.getKey(),
previousValue,
currentValue);
return true;
}
}
return false;
}
private static void releaseLockAndLog(FileLock fLock, String spoutId) {
try {
if (fLock != null) {
fLock.release();
LOG.debug("Spout {} released FileLock. SpoutId = {}", fLock.getLockFile(), spoutId);
}
} catch (IOException e) {
LOG.error("Unable to delete lock file : " + fLock.getLockFile() + " SpoutId =" + spoutId, e);
}
}
/**
* If clocks in sync, then acquires the oldest expired lock Else, on first call, just remembers
* the oldest expired lock, on next call check if the lock is updated. if not updated then
* acquires the lock
*
* @return a lock object
* @throws IOException
*/
private FileLock getOldestExpiredLock() throws IOException {
// 1 - acquire lock on dir
DirLock dirlock = DirLock.tryLock(hdfs, lockDirPath);
if (dirlock == null) {
dirlock = DirLock.takeOwnershipIfStale(hdfs, lockDirPath, lockTimeoutSec);
if (dirlock == null) {
LOG.debug("Spout {} could not take over ownership of DirLock for {}", spoutId, lockDirPath);
return null;
}
LOG.debug(
"Spout {} now took over ownership of abandoned DirLock for {}", spoutId, lockDirPath);
} else {
LOG.debug("Spout {} now owns DirLock for {}", spoutId, lockDirPath);
}
try {
// 2 - if clocks are in sync then simply take ownership of the oldest expired lock
if (clocksInSync) {
return FileLock.acquireOldestExpiredLock(hdfs, lockDirPath, lockTimeoutSec, spoutId);
}
// 3 - if clocks are not in sync ..
if (lastExpiredLock == null) {
// just make a note of the oldest expired lock now and check if its still unmodified after
// lockTimeoutSec
lastExpiredLock = FileLock.locateOldestExpiredLock(hdfs, lockDirPath, lockTimeoutSec);
lastExpiredLockTime = System.currentTimeMillis();
return null;
}
// see if lockTimeoutSec time has elapsed since we last selected the lock file
if (hasExpired(lastExpiredLockTime)) {
return null;
}
// If lock file has expired, then own it
FileLock.LogEntry lastEntry = FileLock.getLastEntry(hdfs, lastExpiredLock.getKey());
if (lastEntry.equals(lastExpiredLock.getValue())) {
FileLock result =
FileLock.takeOwnership(hdfs, lastExpiredLock.getKey(), lastEntry, spoutId);
lastExpiredLock = null;
return result;
} else {
// if lock file has been updated since last time, then leave this lock file alone
lastExpiredLock = null;
return null;
}
} finally {
dirlock.release();
LOG.debug("Released DirLock {}, SpoutID {} ", dirlock.getLockFile(), spoutId);
}
}
private FileReader pickNextFile() {
try {
// 1) If there are any abandoned files, pick oldest one
lock = getOldestExpiredLock();
if (lock != null) {
LOG.debug(
"Spout {} now took over ownership of abandoned FileLock {}",
spoutId,
lock.getLockFile());
Path file = getFileForLockFile(lock.getLockFile(), sourceDirPath);
String resumeFromOffset = lock.getLastLogEntry().fileOffset;
LOG.info("Resuming processing of abandoned file : {}", file);
return createFileReader(file, resumeFromOffset);
}
// 2) If no abandoned files, then pick oldest file in sourceDirPath, lock it and rename it
Collection<Path> listing = HdfsUtils.listFilesByModificationTime(hdfs, sourceDirPath, 0);
for (Path file : listing) {
if (file.getName().endsWith(inprogress_suffix)) {
continue;
}
if (file.getName().endsWith(ignoreSuffix)) {
continue;
}
lock = FileLock.tryLock(hdfs, file, lockDirPath, spoutId);
if (lock == null) {
LOG.debug("Unable to get FileLock for {}, so skipping it.", file);
continue; // could not lock, so try another file.
}
try {
Path newFile = renameToInProgressFile(file);
FileReader result = createFileReader(newFile);
LOG.info("Processing : {} ", file);
return result;
} catch (Exception e) {
LOG.error("Skipping file " + file, e);
releaseLockAndLog(lock, spoutId);
continue;
}
}
return null;
} catch (IOException e) {
LOG.error("Unable to select next file for consumption " + sourceDirPath, e);
return null;
}
}
private boolean onEndWork() {
if (fileLock == null) {
return false;
}
if (contended || fileLock.getMode() == Shared) {
closeFileLock();
}
return true;
}
private void closeFileLock() {
try {
cacheClosedCount++;
try {
// Close the caches and then notify them of the final state, in case the caches do work on
// close
new CompositeStoppable().add(caches).stop();
FileLock.State state = fileLock.getState();
for (MultiProcessSafePersistentIndexedCache cache : caches) {
cache.onEndWork(state);
}
} finally {
fileLock.close();
}
} finally {
fileLock = null;
stateAtOpen = null;
contended = false;
}
}
protected void releaseFileLockAndCloseFileChannel() {
try {
if (fileLock != null) {
fileLock.release();
}
if (fileChannel != null) {
fileChannel.close();
}
} catch (IOException e) {
stringLogger.warn("Could not close [" + storageFileName + "]", e);
}
fileChannel = null;
}
public void initialize(FileLock fileLock) {
for (File file : getBaseDir().listFiles()) {
if (fileLock.isLockFile(file) || file.equals(propertiesFile)) {
continue;
}
GFileUtils.forceDelete(file);
}
if (initAction != null) {
initAction.execute(DefaultPersistentDirectoryCache.this);
}
GUtil.saveProperties(properties, propertiesFile);
didRebuild = true;
}
// will commit progress into lock file if commit threshold is reached
private void commitProgress(FileOffset position) {
if (position == null) {
return;
}
if (lock != null && canCommitNow()) {
try {
String pos = position.toString();
lock.heartbeat(pos);
LOG.debug("{} Committed progress. {}", spoutId, pos);
acksSinceLastCommit = 0;
commitTimeElapsed.set(false);
setupCommitElapseTimer();
} catch (IOException e) {
LOG.error("Unable to commit progress Will retry later. Spout ID = " + spoutId, e);
}
}
}
private boolean onStartWork() {
if (fileLock != null) {
return false;
}
fileLock =
lockManager.lock(
lockFile,
lockOptions.withMode(Exclusive),
cacheDisplayName,
operations.getDescription());
stateAtOpen = fileLock.getState();
for (UnitOfWorkParticipant cache : caches) {
cache.onStartWork(operations.getDescription(), stateAtOpen);
}
lockManager.allowContention(fileLock, whenContended());
return true;
}
/**
* Opens this cache access with the given lock mode. Calling this with {@link
* org.gradle.cache.internal.FileLockManager.LockMode#Exclusive} will lock the cache for exclusive
* access from all other threads (including those in this process and all other processes), until
* {@link #close()} is called.
*
* @param lockOptions
*/
public void open(LockOptions lockOptions) {
lock.lock();
try {
if (owner != null) {
throw new IllegalStateException(
String.format("Cannot open the %s, as it is already in use.", cacheDisplayName));
}
this.lockOptions = lockOptions;
if (lockOptions.getMode() == FileLockManager.LockMode.None) {
return;
}
if (fileLock != null) {
throw new IllegalStateException("File lock " + lockFile + " is already open.");
}
fileLock = lockManager.lock(lockFile, lockOptions, cacheDisplayName);
stateAtOpen = fileLock.getState();
takeOwnership(String.format("Access %s", cacheDisplayName));
lockManager.allowContention(fileLock, whenContended());
} finally {
lock.unlock();
}
}
