private static EventQueueBackingStore upgrade(
File checkpointFile,
int capacity,
String name,
File backupCheckpointDir,
boolean shouldBackup,
boolean compressBackup)
throws Exception {
LOG.info("Attempting upgrade of " + checkpointFile + " for " + name);
EventQueueBackingStoreFileV2 backingStoreV2 =
new EventQueueBackingStoreFileV2(checkpointFile, capacity, name);
String backupName = checkpointFile.getName() + "-backup-" + System.currentTimeMillis();
Files.copy(checkpointFile, new File(checkpointFile.getParentFile(), backupName));
File metaDataFile = Serialization.getMetaDataFile(checkpointFile);
EventQueueBackingStoreFileV3.upgrade(backingStoreV2, checkpointFile, metaDataFile);
return new EventQueueBackingStoreFileV3(
checkpointFile, capacity, name, backupCheckpointDir, shouldBackup, compressBackup);
}
static EventQueueBackingStore get(
File checkpointFile,
File backupCheckpointDir,
int capacity,
String name,
boolean upgrade,
boolean shouldBackup,
boolean compressBackup)
throws Exception {
File metaDataFile = Serialization.getMetaDataFile(checkpointFile);
RandomAccessFile checkpointFileHandle = null;
try {
boolean checkpointExists = checkpointFile.exists();
boolean metaDataExists = metaDataFile.exists();
if (metaDataExists) {
// if we have a metadata file but no checkpoint file, we have a problem
// delete everything in the checkpoint directory and force
// a full replay.
if (!checkpointExists || checkpointFile.length() == 0) {
LOG.warn(
"MetaData file for checkpoint "
+ " exists but checkpoint does not. Checkpoint = "
+ checkpointFile
+ ", metaDataFile = "
+ metaDataFile);
throw new BadCheckpointException(
"The last checkpoint was not completed correctly, "
+ "since Checkpoint file does not exist while metadata "
+ "file does.");
}
}
// brand new, use v3
if (!checkpointExists) {
if (!checkpointFile.createNewFile()) {
throw new IOException("Cannot create " + checkpointFile);
}
return new EventQueueBackingStoreFileV3(
checkpointFile, capacity, name, backupCheckpointDir, shouldBackup, compressBackup);
}
// v3 due to meta file, version will be checked by backing store
if (metaDataExists) {
return new EventQueueBackingStoreFileV3(
checkpointFile, capacity, name, backupCheckpointDir, shouldBackup, compressBackup);
}
checkpointFileHandle = new RandomAccessFile(checkpointFile, "r");
int version = (int) checkpointFileHandle.readLong();
if (Serialization.VERSION_2 == version) {
if (upgrade) {
return upgrade(
checkpointFile, capacity, name, backupCheckpointDir, shouldBackup, compressBackup);
}
return new EventQueueBackingStoreFileV2(checkpointFile, capacity, name);
}
LOG.error("Found version " + Integer.toHexString(version) + " in " + checkpointFile);
throw new BadCheckpointException(
"Checkpoint file exists with "
+ Serialization.VERSION_3
+ " but no metadata file found.");
} finally {
if (checkpointFileHandle != null) {
try {
checkpointFileHandle.close();
} catch (IOException e) {
LOG.warn("Unable to close " + checkpointFile, e);
}
}
}
}
