/** @return a {@link JournalEntry} representing the state of the container id generator */
private JournalEntry getContainerIdJournalEntry() {
BlockContainerIdGeneratorEntry blockContainerIdGenerator =
BlockContainerIdGeneratorEntry.newBuilder()
.setNextContainerId(mJournaledNextContainerId)
.build();
return JournalEntry.newBuilder()
.setBlockContainerIdGenerator(blockContainerIdGenerator)
.build();
}
@Override
public void streamToJournalCheckpoint(JournalOutputStream outputStream) throws IOException {
outputStream.writeEntry(getContainerIdJournalEntry());
for (MasterBlockInfo blockInfo : mBlocks.values()) {
BlockInfoEntry blockInfoEntry =
BlockInfoEntry.newBuilder()
.setBlockId(blockInfo.getBlockId())
.setLength(blockInfo.getLength())
.build();
outputStream.writeEntry(JournalEntry.newBuilder().setBlockInfo(blockInfoEntry).build());
}
}
/**
* Marks a block as committed, but without a worker location. This means the block is only in ufs.
*
* @param blockId the id of the block to commit
* @param length the length of the block
*/
public void commitBlockInUFS(long blockId, long length) {
LOG.debug("Commit block in ufs. blockId: {}, length: {}", blockId, length);
if (mBlocks.get(blockId) != null) {
// Block metadata already exists, so do not need to create a new one.
return;
}
// The block has not been committed previously, so add the metadata to commit the block.
MasterBlockInfo block = new MasterBlockInfo(blockId, length);
long counter = AsyncJournalWriter.INVALID_FLUSH_COUNTER;
synchronized (block) {
if (mBlocks.putIfAbsent(blockId, block) == null) {
// Successfully added the new block metadata. Append a journal entry for the new metadata.
BlockInfoEntry blockInfo =
BlockInfoEntry.newBuilder().setBlockId(blockId).setLength(length).build();
counter = appendJournalEntry(JournalEntry.newBuilder().setBlockInfo(blockInfo).build());
}
}
waitForJournalFlush(counter);
}
// TODO(binfan): check the logic is correct or not when commitBlock is a retry
public void commitBlock(
long workerId, long usedBytesOnTier, String tierAlias, long blockId, long length)
throws NoWorkerException {
LOG.debug(
"Commit block from workerId: {}, usedBytesOnTier: {}, blockId: {}, length: {}",
workerId,
usedBytesOnTier,
blockId,
length);
long counter = AsyncJournalWriter.INVALID_FLUSH_COUNTER;
MasterWorkerInfo worker = mWorkers.getFirstByField(ID_INDEX, workerId);
// TODO(peis): Check lost workers as well.
if (worker == null) {
throw new NoWorkerException(ExceptionMessage.NO_WORKER_FOUND.getMessage(workerId));
}
// Lock the worker metadata first.
synchronized (worker) {
// Loop until block metadata is successfully locked.
for (; ; ) {
boolean newBlock = false;
MasterBlockInfo block = mBlocks.get(blockId);
if (block == null) {
// The block metadata doesn't exist yet.
block = new MasterBlockInfo(blockId, length);
newBlock = true;
}
// Lock the block metadata.
synchronized (block) {
boolean writeJournal = false;
if (newBlock) {
if (mBlocks.putIfAbsent(blockId, block) != null) {
// Another thread already inserted the metadata for this block, so start loop over.
continue;
}
// Successfully added the new block metadata. Append a journal entry for the new
// metadata.
writeJournal = true;
} else if (block.getLength() != length && block.getLength() == Constants.UNKNOWN_SIZE) {
// The block size was previously unknown. Update the block size with the committed
// size, and append a journal entry.
block.updateLength(length);
writeJournal = true;
}
if (writeJournal) {
BlockInfoEntry blockInfo =
BlockInfoEntry.newBuilder().setBlockId(blockId).setLength(length).build();
counter = appendJournalEntry(JournalEntry.newBuilder().setBlockInfo(blockInfo).build());
}
// At this point, both the worker and the block metadata are locked.
// Update the block metadata with the new worker location.
block.addWorker(workerId, tierAlias);
// This worker has this block, so it is no longer lost.
mLostBlocks.remove(blockId);
// Update the worker information for this new block.
// TODO(binfan): when retry commitBlock on master is expected, make sure metrics are not
// double counted.
worker.addBlock(blockId);
worker.updateUsedBytes(tierAlias, usedBytesOnTier);
worker.updateLastUpdatedTimeMs();
}
break;
}
}
waitForJournalFlush(counter);
}