Examples with KeySliceQuery com.thinkaurelius.titan.diskstorage.keycolumnvalue.KeySliceQuery used on opensource projects

Example 1 with KeySliceQuery

use of com.thinkaurelius.titan.diskstorage.keycolumnvalue.KeySliceQuery in project titan by thinkaurelius.

the class ExpectedValueCheckingTest method testMutateManyWithLockUsesConsistentTx.

@Test
public void testMutateManyWithLockUsesConsistentTx() throws BackendException {
    final ImmutableList<Entry> adds = ImmutableList.of(StaticArrayEntry.of(DATA_COL, DATA_VAL));
    final ImmutableList<StaticBuffer> dels = ImmutableList.<StaticBuffer>of();
    Map<String, Map<StaticBuffer, KCVMutation>> mutations = ImmutableMap.<String, Map<StaticBuffer, KCVMutation>>of(STORE_NAME, ImmutableMap.<StaticBuffer, KCVMutation>of(DATA_KEY, new KCVMutation(adds, dels)));
    final KeyColumn kc = new KeyColumn(LOCK_KEY, LOCK_COL);
    // Acquire a lock
    backingLocker.writeLock(kc, consistentTx);
    // 2. Run mutateMany
    // 2.1. Check locks & expected values before mutating data
    backingLocker.checkLocks(consistentTx);
    StaticBuffer nextBuf = BufferUtil.nextBiggerBuffer(kc.getColumn());
    KeySliceQuery expectedValueQuery = new KeySliceQuery(kc.getKey(), kc.getColumn(), nextBuf);
    // expected value read must use strong consistency
    expect(backingStore.getSlice(expectedValueQuery, consistentTx)).andReturn(StaticArrayEntryList.of(StaticArrayEntry.of(LOCK_COL, LOCK_VAL)));
    // 2.2. Run mutateMany on backing manager to modify data
    // writes by txs with locks must use strong consistency
    backingManager.mutateMany(mutations, consistentTx);
    ctrl.replay();
    // Lock acquisition
    expectStore.acquireLock(LOCK_KEY, LOCK_COL, LOCK_VAL, expectTx);
    // Mutate
    expectManager.mutateMany(mutations, expectTx);
}

Example 2 with KeySliceQuery

use of com.thinkaurelius.titan.diskstorage.keycolumnvalue.KeySliceQuery in project titan by thinkaurelius.

the class ExpectedValueCheckingTest method testMutateWithLockUsesConsistentTx.

@Test
public void testMutateWithLockUsesConsistentTx() throws BackendException {
    final ImmutableList<Entry> adds = ImmutableList.of(StaticArrayEntry.of(DATA_COL, DATA_VAL));
    final ImmutableList<StaticBuffer> dels = ImmutableList.<StaticBuffer>of();
    final KeyColumn kc = new KeyColumn(LOCK_KEY, LOCK_COL);
    // 1. Acquire a lock
    backingLocker.writeLock(kc, consistentTx);
    // 2. Run a mutation
    // N.B. mutation coordinates do not overlap with the lock, but consistentTx should be used anyway
    // 2.1. Check locks & expected values before mutating data
    backingLocker.checkLocks(consistentTx);
    StaticBuffer nextBuf = BufferUtil.nextBiggerBuffer(kc.getColumn());
    KeySliceQuery expectedValueQuery = new KeySliceQuery(kc.getKey(), kc.getColumn(), nextBuf);
    // expected value read must use strong consistency
    expect(backingStore.getSlice(expectedValueQuery, consistentTx)).andReturn(StaticArrayEntryList.of(StaticArrayEntry.of(LOCK_COL, LOCK_VAL)));
    // 2.2. Mutate data
    // writes by txs with locks must use strong consistency
    backingStore.mutate(DATA_KEY, adds, dels, consistentTx);
    ctrl.replay();
    // 1. Lock acquisition
    expectStore.acquireLock(LOCK_KEY, LOCK_COL, LOCK_VAL, expectTx);
    // 2. Mutate
    expectStore.mutate(DATA_KEY, adds, dels, expectTx);
}

Example 3 with KeySliceQuery

use of com.thinkaurelius.titan.diskstorage.keycolumnvalue.KeySliceQuery in project titan by thinkaurelius.

the class ExpirationCacheTest method verifyResults.

private void verifyResults(StaticBuffer key, List<StaticBuffer> keys, SliceQuery query, int expectedResults) throws Exception {
    CacheTransaction tx = getCacheTx();
    assertEquals(expectedResults, cache.getSlice(new KeySliceQuery(key, query), tx).size());
    Map<StaticBuffer, EntryList> results = cache.getSlice(keys, query, tx);
    assertEquals(keys.size(), results.size());
    assertEquals(expectedResults, results.get(key).size());
    tx.commit();
}

Example 4 with KeySliceQuery

use of com.thinkaurelius.titan.diskstorage.keycolumnvalue.KeySliceQuery in project titan by thinkaurelius.

the class MultiKeySliceQuery method execute.

public List<EntryList> execute(final BackendTransaction tx) {
    int total = 0;
    List<EntryList> result = new ArrayList<EntryList>(4);
    for (KeySliceQuery ksq : queries) {
        EntryList next = tx.indexQuery(ksq.updateLimit(getLimit() - total));
        result.add(next);
        total += next.size();
        if (total >= getLimit())
            break;
    }
    return result;
}

Example 5 with KeySliceQuery

use of com.thinkaurelius.titan.diskstorage.keycolumnvalue.KeySliceQuery in project titan by thinkaurelius.

the class ConsistentKeyIDAuthority method getIDBlock.

@Override
public synchronized IDBlock getIDBlock(final int partition, final int idNamespace, Duration timeout) throws BackendException {
    Preconditions.checkArgument(partition >= 0 && partition < (1 << partitionBitWdith), "Invalid partition id [%s] for bit width [%s]", partition, partitionBitWdith);
    //can be any non-negative value
    Preconditions.checkArgument(idNamespace >= 0);
    final Timer methodTime = times.getTimer().start();
    final long blockSize = getBlockSize(idNamespace);
    final long idUpperBound = getIdUpperBound(idNamespace);
    final int maxAvailableBits = (VariableLong.unsignedBitLength(idUpperBound) - 1) - uniqueIdBitWidth;
    Preconditions.checkArgument(maxAvailableBits > 0, "Unique id bit width [%s] is too wide for id-namespace [%s] id bound [%s]", uniqueIdBitWidth, idNamespace, idUpperBound);
    final long idBlockUpperBound = (1l << maxAvailableBits);
    final List<Integer> exhaustedUniquePIDs = new ArrayList<Integer>(randomUniqueIDLimit);
    Duration backoffMS = idApplicationWaitMS;
    Preconditions.checkArgument(idBlockUpperBound > blockSize, "Block size [%s] is larger than upper bound [%s] for bit width [%s]", blockSize, idBlockUpperBound, uniqueIdBitWidth);
    while (methodTime.elapsed().compareTo(timeout) < 0) {
        final int uniquePID = getUniquePartitionID();
        final StaticBuffer partitionKey = getPartitionKey(partition, idNamespace, uniquePID);
        try {
            long nextStart = getCurrentID(partitionKey);
            if (idBlockUpperBound - blockSize <= nextStart) {
                log.info("ID overflow detected on partition({})-namespace({}) with uniqueid {}. Current id {}, block size {}, and upper bound {} for bit width {}.", partition, idNamespace, uniquePID, nextStart, blockSize, idBlockUpperBound, uniqueIdBitWidth);
                if (randomizeUniqueId) {
                    exhaustedUniquePIDs.add(uniquePID);
                    if (exhaustedUniquePIDs.size() == randomUniqueIDLimit)
                        throw new IDPoolExhaustedException(String.format("Exhausted %d uniqueid(s) on partition(%d)-namespace(%d): %s", exhaustedUniquePIDs.size(), partition, idNamespace, Joiner.on(",").join(exhaustedUniquePIDs)));
                    else
                        throw new UniqueIDExhaustedException(String.format("Exhausted ID partition(%d)-namespace(%d) with uniqueid %d (uniqueid attempt %d/%d)", partition, idNamespace, uniquePID, exhaustedUniquePIDs.size(), randomUniqueIDLimit));
                }
                throw new IDPoolExhaustedException("Exhausted id block for partition(" + partition + ")-namespace(" + idNamespace + ") with upper bound: " + idBlockUpperBound);
            }
            // calculate the start (inclusive) and end (exclusive) of the allocation we're about to attempt
            assert idBlockUpperBound - blockSize > nextStart;
            long nextEnd = nextStart + blockSize;
            StaticBuffer target = null;
            // attempt to write our claim on the next id block
            boolean success = false;
            try {
                Timer writeTimer = times.getTimer().start();
                target = getBlockApplication(nextEnd, writeTimer.getStartTime());
                // copy for the inner class
                final StaticBuffer finalTarget = target;
                BackendOperation.execute(new BackendOperation.Transactional<Boolean>() {

                    @Override
                    public Boolean call(StoreTransaction txh) throws BackendException {
                        idStore.mutate(partitionKey, Arrays.asList(StaticArrayEntry.of(finalTarget)), KeyColumnValueStore.NO_DELETIONS, txh);
                        return true;
                    }
                }, this, times);
                writeTimer.stop();
                Duration writeElapsed = writeTimer.elapsed();
                if (idApplicationWaitMS.compareTo(writeElapsed) < 0) {
                    throw new TemporaryBackendException("Wrote claim for id block [" + nextStart + ", " + nextEnd + ") in " + (writeElapsed) + " => too slow, threshold is: " + idApplicationWaitMS);
                } else {
                    assert 0 != target.length();
                    final StaticBuffer[] slice = getBlockSlice(nextEnd);
                    /* At this point we've written our claim on [nextStart, nextEnd),
                         * but we haven't yet guaranteed the absence of a contending claim on
                         * the same id block from another machine
                         */
                    sleepAndConvertInterrupts(idApplicationWaitMS.plus(waitGracePeriod));
                    // Read all id allocation claims on this partition, for the counter value we're claiming
                    List<Entry> blocks = BackendOperation.execute(new BackendOperation.Transactional<List<Entry>>() {

                        @Override
                        public List<Entry> call(StoreTransaction txh) throws BackendException {
                            return idStore.getSlice(new KeySliceQuery(partitionKey, slice[0], slice[1]), txh);
                        }
                    }, this, times);
                    if (blocks == null)
                        throw new TemporaryBackendException("Could not read from storage");
                    if (blocks.isEmpty())
                        throw new PermanentBackendException("It seems there is a race-condition in the block application. " + "If you have multiple Titan instances running on one physical machine, ensure that they have unique machine idAuthorities");
                    /* If our claim is the lexicographically first one, then our claim
                         * is the most senior one and we own this id block
                         */
                    if (target.equals(blocks.get(0).getColumnAs(StaticBuffer.STATIC_FACTORY))) {
                        ConsistentKeyIDBlock idblock = new ConsistentKeyIDBlock(nextStart, blockSize, uniqueIdBitWidth, uniquePID);
                        if (log.isDebugEnabled()) {
                            log.debug("Acquired ID block [{}] on partition({})-namespace({}) (my rid is {})", new Object[] { idblock, partition, idNamespace, new String(uid) });
                        }
                        success = true;
                        return idblock;
                    } else {
                        // Another claimant beat us to this id block -- try again.
                        log.debug("Failed to acquire ID block [{},{}) (another host claimed it first)", nextStart, nextEnd);
                    }
                }
            } finally {
                if (!success && null != target) {
                    //Delete claim to not pollute id space
                    for (int attempt = 0; attempt < rollbackAttempts; attempt++) {
                        try {
                            // copy for the inner class
                            final StaticBuffer finalTarget = target;
                            BackendOperation.execute(new BackendOperation.Transactional<Boolean>() {

                                @Override
                                public Boolean call(StoreTransaction txh) throws BackendException {
                                    idStore.mutate(partitionKey, KeyColumnValueStore.NO_ADDITIONS, Arrays.asList(finalTarget), txh);
                                    return true;
                                }
                            }, new //Use normal consistency level for these non-critical delete operations
                            BackendOperation.TransactionalProvider() {

                                @Override
                                public StoreTransaction openTx() throws BackendException {
                                    return manager.beginTransaction(storeTxConfigBuilder.build());
                                }

                                @Override
                                public void close() {
                                }
                            }, times);
                            break;
                        } catch (BackendException e) {
                            log.warn("Storage exception while deleting old block application - retrying in {}", rollbackWaitTime, e);
                            if (!rollbackWaitTime.isZero())
                                sleepAndConvertInterrupts(rollbackWaitTime);
                        }
                    }
                }
            }
        } catch (UniqueIDExhaustedException e) {
            // No need to increment the backoff wait time or to sleep
            log.warn(e.getMessage());
        } catch (TemporaryBackendException e) {
            backoffMS = Durations.min(backoffMS.multipliedBy(2), idApplicationWaitMS.multipliedBy(32));
            log.warn("Temporary storage exception while acquiring id block - retrying in {}: {}", backoffMS, e);
            sleepAndConvertInterrupts(backoffMS);
        }
    }
    throw new TemporaryLockingException(String.format("Reached timeout %d (%s elapsed) when attempting to allocate id block on partition(%d)-namespace(%d)", timeout, methodTime.toString(), partition, idNamespace));
}