Examples with LockResource alluxio.resource.LockResource used on opensource projects

Example 71 with LockResource

use of alluxio.resource.LockResource in project alluxio by Alluxio.

the class BufferedJournalApplier method resume.

/**
 * Resumes the applier. This method will apply all buffered entries before returning.
 *
 * @throws IOException
 */
public void resume() throws IOException {
    try (LockResource stateLock = new LockResource(mStateLock)) {
        Preconditions.checkState(mSuspended, "Not suspended");
        Preconditions.checkState(!mResumeInProgress, "Resume in progress");
        mResumeInProgress = true;
        LOG.info("Resuming state machine from sequence: {}", mLastAppliedSequence);
    }
    cancelCatchup();
    /**
     * Applies all buffered entries.
     *
     * It doesn't block state until
     *   -> buffer contains few elements ( RESUME_LOCK_BUFFER_SIZE_WATERMARK )
     *   -> was running for a long time  ( RESUME_LOCK_TIME_LIMIT_MS         )
     */
    try {
        // Mark resume start time.
        long resumeStartTimeMs = System.currentTimeMillis();
        // Lock initially if few or none elements in the queue.
        if (mSuspendBuffer.size() <= RESUME_LOCK_BUFFER_SIZE_WATERMARK) {
            mStateLock.lock();
        }
        while (!mSuspendBuffer.isEmpty()) {
            applyToMaster(mSuspendBuffer.remove());
            // Check whether to lock the state now.
            boolean lockSubmission = !mStateLock.isHeldByCurrentThread() && (mSuspendBuffer.size() <= RESUME_LOCK_BUFFER_SIZE_WATERMARK || (System.currentTimeMillis() - resumeStartTimeMs) > RESUME_LOCK_TIME_LIMIT_MS);
            if (lockSubmission) {
                mStateLock.lock();
            }
        }
    } finally {
        mSuspended = false;
        mResumeInProgress = false;
        mCatchupThread = null;
        mStateLock.unlock();
    }
}

Example 72 with LockResource

use of alluxio.resource.LockResource in project alluxio by Alluxio.

the class BufferedJournalApplier method suspend.

/**
 * Suspend the applier.
 *
 * After this call, journal entries will be buffered until {@link #resume()} or
 * {@link #catchup(long)} is called.
 *
 * @throws IOException
 */
public void suspend() throws IOException {
    try (LockResource stateLock = new LockResource(mStateLock)) {
        Preconditions.checkState(!mSuspended, "Already suspended");
        mSuspended = true;
        LOG.info("Suspended state machine at sequence: {}", mLastAppliedSequence);
    }
}

Example 73 with LockResource

use of alluxio.resource.LockResource in project alluxio by Alluxio.

the class DefaultBlockMaster method generateBlockInfo.

/**
 * Generates block info, including worker locations, for a block id.
 * This requires no locks on the {@link MasterWorkerInfo} because it is only reading
 * final fields.
 *
 * @param blockId a block id
 * @return optional block info, empty if the block does not exist
 */
private Optional<BlockInfo> generateBlockInfo(long blockId) throws UnavailableException {
    if (mSafeModeManager.isInSafeMode()) {
        throw new UnavailableException(ExceptionMessage.MASTER_IN_SAFEMODE.getMessage());
    }
    BlockMeta block;
    List<BlockLocation> blockLocations;
    try (LockResource r = lockBlock(blockId)) {
        Optional<BlockMeta> blockOpt = mBlockStore.getBlock(blockId);
        if (!blockOpt.isPresent()) {
            return Optional.empty();
        }
        block = blockOpt.get();
        blockLocations = new ArrayList<>(mBlockStore.getLocations(blockId));
    }
    // Sort the block locations by their alias ordinal in the master storage tier mapping
    Collections.sort(blockLocations, Comparator.comparingInt(o -> mGlobalStorageTierAssoc.getOrdinal(o.getTier())));
    List<alluxio.wire.BlockLocation> locations = new ArrayList<>();
    for (BlockLocation location : blockLocations) {
        MasterWorkerInfo workerInfo = mWorkers.getFirstByField(ID_INDEX, location.getWorkerId());
        if (workerInfo != null) {
            // worker metadata is intentionally not locked here because:
            // - it would be an incorrect order (correct order is lock worker first, then block)
            // - only uses getters of final variables
            locations.add(new alluxio.wire.BlockLocation().setWorkerId(location.getWorkerId()).setWorkerAddress(workerInfo.getWorkerAddress()).setTierAlias(location.getTier()).setMediumType(location.getMediumType()));
        }
    }
    return Optional.of(new BlockInfo().setBlockId(blockId).setLength(block.getLength()).setLocations(locations));
}

Example 74 with LockResource

use of alluxio.resource.LockResource in project alluxio by Alluxio.

the class DefaultBlockMaster method processWorkerAddedBlocks.

/**
 * Updates the worker and block metadata for blocks added to a worker.
 *
 * You should lock externally with {@link MasterWorkerInfo#lockWorkerMeta(EnumSet, boolean)}
 * with {@link WorkerMetaLockSection#BLOCKS} specified.
 * An exclusive lock is required.
 *
 * @param workerInfo The worker metadata object
 * @param addedBlockIds A mapping from storage tier alias to a list of block ids added
 */
private void processWorkerAddedBlocks(MasterWorkerInfo workerInfo, Map<BlockLocation, List<Long>> addedBlockIds) {
    long invalidBlockCount = 0;
    for (Map.Entry<BlockLocation, List<Long>> entry : addedBlockIds.entrySet()) {
        for (long blockId : entry.getValue()) {
            try (LockResource r = lockBlock(blockId)) {
                Optional<BlockMeta> block = mBlockStore.getBlock(blockId);
                if (block.isPresent()) {
                    workerInfo.addBlock(blockId);
                    BlockLocation location = entry.getKey();
                    Preconditions.checkState(location.getWorkerId() == workerInfo.getId(), "BlockLocation has a different workerId %s from the request sender's workerId %s", location.getWorkerId(), workerInfo.getId());
                    mBlockStore.addLocation(blockId, location);
                    mLostBlocks.remove(blockId);
                } else {
                    invalidBlockCount++;
                    // The block is not recognized and should therefore be purged from the worker
                    // The file may have been removed when the worker was lost
                    workerInfo.scheduleRemoveFromWorker(blockId);
                    LOG.debug("Invalid block: {} from worker {}.", blockId, workerInfo.getWorkerAddress().getHost());
                }
            }
        }
    }
    if (invalidBlockCount > 0) {
        LOG.warn("{} invalid blocks found on worker {} in total", invalidBlockCount, workerInfo.getWorkerAddress().getHost());
    }
}

Example 75 with LockResource

use of alluxio.resource.LockResource in project alluxio by Alluxio.

the class DefaultBlockMaster method commitBlock.

// TODO(binfan): check the logic is correct or not when commitBlock is a retry
@Override
public void commitBlock(long workerId, long usedBytesOnTier, String tierAlias, String mediumType, long blockId, long length) throws NotFoundException, UnavailableException {
    LOG.debug("Commit block from workerId: {}, usedBytesOnTier: {}, blockId: {}, length: {}", workerId, usedBytesOnTier, blockId, length);
    MasterWorkerInfo worker = mWorkers.getFirstByField(ID_INDEX, workerId);
    // TODO(peis): Check lost workers as well.
    if (worker == null) {
        throw new NotFoundException(ExceptionMessage.NO_WORKER_FOUND.getMessage(workerId));
    }
    try (JournalContext journalContext = createJournalContext()) {
        // The worker metadata must be locked before the blocks
        try (LockResource lr = worker.lockWorkerMeta(EnumSet.of(WorkerMetaLockSection.USAGE, WorkerMetaLockSection.BLOCKS), false)) {
            try (LockResource r = lockBlock(blockId)) {
                Optional<BlockMeta> block = mBlockStore.getBlock(blockId);
                if (!block.isPresent() || block.get().getLength() != length) {
                    if (block.isPresent() && block.get().getLength() != Constants.UNKNOWN_SIZE) {
                        LOG.warn("Rejecting attempt to change block length from {} to {}", block.get().getLength(), length);
                    } else {
                        mBlockStore.putBlock(blockId, BlockMeta.newBuilder().setLength(length).build());
                        BlockInfoEntry blockInfo = BlockInfoEntry.newBuilder().setBlockId(blockId).setLength(length).build();
                        journalContext.append(JournalEntry.newBuilder().setBlockInfo(blockInfo).build());
                    }
                }
                // Update the block metadata with the new worker location.
                mBlockStore.addLocation(blockId, BlockLocation.newBuilder().setWorkerId(workerId).setTier(tierAlias).setMediumType(mediumType).build());
                // 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();
    }
}