Method unlockRow

src/HBaseClient.java:2193–2215

Releases an explicit row lock. For a description of what row locks are, see RowLock. @param lock The lock to release. @return A deferred object that indicates the completion of the request. The Object has not special meaning and can be null (think of it as {@code Deferred

(final RowLock lock)

   * (think of it as {@code Deferred<Void>}).
   */
  public Deferred<Object> unlockRow(final RowLock lock) {
    final byte[] region_name = lock.region();
    final RegionInfo region = regions_cache.get(region_name);
    if (knownToBeNSREd(region)) {
      // If this region has been NSRE'd, we can't possibly still hold a lock
      // on one of its rows, as this would have prevented it from splitting.
      // So let's just pretend the row has been unlocked.
      return Deferred.fromResult(null);
    }
    final RegionClient client = clientFor(region);
    if (client == null) {
      // Oops, we no longer know anything about this client or region.  Our
      // cache was probably invalidated while the client was holding the lock.
      LOG.warn("Cannot release " + lock + ", no connection open for "
               + Bytes.pretty(region_name));
      return Deferred.fromResult(null);
    }
    final HBaseRpc release = new RowLockRequest.ReleaseRequest(lock, region);
    release.setRegion(region);
    final Deferred<Object> d = release.getDeferred();
    client.sendRpc(release);
    return d;
  }

  /**
   * Deletes data from HBase.