Examples of org.apache.hadoop.hbase.util.HashedBytes

org.apache.hadoop.hbase.util.HashedBytes
This class encapsulates a byte array and overrides hashCode and equals so that it's identity is based on the data rather than the array instance.

        // If we haven't got any rows in our batch, we should block to
        // get the next one.
        boolean shouldBlock = numReadyToWrite == 0;
        boolean failedToAcquire = false;
        Integer acquiredLockId = null;
        HashedBytes currentRow = new HashedBytes(mutation.getRow());
        try {
          if (providedLockId != null || !rowsAlreadyLocked.contains(currentRow)) {
            acquiredLockId = getLock(providedLockId, currentRow, shouldBlock);
            if (acquiredLockId == null) {
              failedToAcquire = true;

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  public Integer obtainRowLock(final byte [] row) throws IOException {
    startRegionOperation();
    this.writeRequestsCount.increment();
    this.opMetrics.setWriteRequestCountMetrics( this.writeRequestsCount.get());
    try {
      return internalObtainRowLock(new HashedBytes(row), true);
    } finally {
      closeRegionOperation();
    }
  }

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      }


      // loop until we generate an unused lock id
      while (true) {
        Integer lockId = lockIdGenerator.incrementAndGet();
        HashedBytes existingRowKey = lockIds.putIfAbsent(lockId, rowKey);
        if (existingRowKey == null) {
          return lockId;
        } else {
          // lockId already in use, jump generator to a new spot
          lockIdGenerator.set(rand.nextInt());

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   * Used by unit tests.
   * @param lockid
   * @return Row that goes with <code>lockid</code>
   */
  byte[] getRowFromLock(final Integer lockid) {
    HashedBytes rowKey = lockIds.get(lockid);
    return rowKey == null ? null : rowKey.getBytes();
  }

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   * Release the row lock!
   * @param lockId  The lock ID to release.
   */
  public void releaseRowLock(final Integer lockId) {
    if (lockId == null) return; // null lock id, do nothing
    HashedBytes rowKey = lockIds.remove(lockId);
    if (rowKey == null) {
      LOG.warn("Release unknown lockId: " + lockId);
      return;
    }
    CountDownLatch rowLatch = lockedRows.remove(rowKey);

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   * simply return null if it could not acquire the lock.
   * @return lockid or null if waitForLock is false and the lock was unavailable.
   */
  public Integer getLock(Integer lockid, byte [] row, boolean waitForLock)
  throws IOException {
    return getLock(lockid, new HashedBytes(row), waitForLock);
  }

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  throws IOException {
    Integer lid;
    if (lockid == null) {
      lid = internalObtainRowLock(row, waitForLock);
    } else {
      HashedBytes rowFromLock = lockIds.get(lockid);
      if (!row.equals(rowFromLock)) {
        throw new IOException("Invalid row lock: LockId: " + lockid + " holds the lock for row: " + rowFromLock + " but wanted lock for row: " + row);
      }
      lid = lockid;
    }

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        // If we haven't got any rows in our batch, we should block to
        // get the next one.
        boolean shouldBlock = numReadyToWrite == 0;
        boolean failedToAcquire = false;
        Integer acquiredLockId = null;
        HashedBytes currentRow = new HashedBytes(mutation.getRow());
        try {
          if (providedLockId != null || !rowsAlreadyLocked.contains(currentRow)) {
            acquiredLockId = getLock(providedLockId, currentRow, shouldBlock);
            if (acquiredLockId == null) {
              failedToAcquire = true;

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  public Integer obtainRowLock(final byte [] row) throws IOException {
    startRegionOperation();
    this.writeRequestsCount.increment();
    this.opMetrics.setWriteRequestCountMetrics( this.writeRequestsCount.get());
    try {
      return internalObtainRowLock(new HashedBytes(row), true);
    } finally {
      closeRegionOperation();
    }
  }

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      }


      // loop until we generate an unused lock id
      while (true) {
        Integer lockId = lockIdGenerator.incrementAndGet();
        HashedBytes existingRowKey = lockIds.putIfAbsent(lockId, rowKey);
        if (existingRowKey == null) {
          return lockId;
        } else {
          // lockId already in use, jump generator to a new spot
          lockIdGenerator.set(rand.nextInt());

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Related Classes of org.apache.hadoop.hbase.util.HashedBytes

org.apache.hadoop.hbase.regionserver.HRegion

org.apache.hadoop.hbase.regionserver.TestBatchHRegionLockingAndWrites

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