/**
* param @ table - name of table for which we are maintaining this commit log. param @
* recoverymode - is commit log being instantiated in in recovery mode.
*/
private CommitLog() {
try {
DatabaseDescriptor.createAllDirectories();
segmentSize = DatabaseDescriptor.getCommitLogSegmentSize();
} catch (IOException e) {
throw new IOError(e);
}
// all old segments are recovered and deleted before CommitLog is instantiated.
// All we need to do is create a new one.
segments.add(new CommitLogSegment());
executor =
DatabaseDescriptor.getCommitLogSync() == Config.CommitLogSync.batch
? new BatchCommitLogExecutorService()
: new PeriodicCommitLogExecutorService(this);
}
@VisibleForTesting
CommitLog(String location, CommitLogArchiver archiver) {
compressorClass = DatabaseDescriptor.getCommitLogCompression();
this.location = location;
ICompressor compressor =
compressorClass != null ? CompressionParameters.createCompressor(compressorClass) : null;
DatabaseDescriptor.createAllDirectories();
this.compressor = compressor;
this.archiver = archiver;
metrics = new CommitLogMetrics();
executor =
DatabaseDescriptor.getCommitLogSync() == Config.CommitLogSync.batch
? new BatchCommitLogService(this)
: new PeriodicCommitLogService(this);
allocator = new CommitLogSegmentManager(this);
// register metrics
metrics.attach(executor, allocator);
}
/**
* param @ table - name of table for which we are maintaining this commit log. param @
* recoverymode - is commit log being instantiated in in recovery mode.
*/
private CommitLog() {
// all old segments are recovered and deleted before CommitLog is instantiated.
// All we need to do is create a new one.
segments.add(new CommitLogSegment());
if (DatabaseDescriptor.getCommitLogSync() == Config.CommitLogSync.periodic) {
executor = new PeriodicCommitLogExecutorService();
final Callable syncer =
new Callable() {
public Object call() throws Exception {
sync();
return null;
}
};
new Thread(
new Runnable() {
public void run() {
while (true) {
try {
executor.submit(syncer).get();
Thread.sleep(DatabaseDescriptor.getCommitLogSyncPeriod());
} catch (InterruptedException e) {
throw new AssertionError(e);
} catch (ExecutionException e) {
throw new RuntimeException(e);
}
}
}
},
"PERIODIC-COMMIT-LOG-SYNCER")
.start();
} else {
executor = new BatchCommitLogExecutorService();
}
}