Examples of RowLock

org.apache.derby.iapi.store.raw.RowLock
A RowLock represents a qualifier that is to be used when locking a Row through a RecordHandle.
MT - Immutable @see RecordHandle @see LockingPolicy
org.apache.hadoop.hbase.client.RowLock
Holds row name and lock id. @deprecated {@link RowLock} and associated operations are deprecated.
org.apache.hadoop.hbase.regionserver.HRegion.RowLock
org.hbase.async.RowLock
An explicit row lock.
Row locks can be explicitly acquired in order to serialize edits to a given row. This feature may disappear from HBase in the future, so try not to use it if you can.
While a row is locked, no one else can edit that row. Other concurrent attempts to lock that row will block until the lock is released. Beware that the blocking happens inside the RegionServer, so it will tie up a thread of the RegionServer. If you have many clients contending for the same row lock, you can literally starve a RegionServer by blocking all its IPC threads.
Row locks can't be held indefinitely. If you don't release a row lock after a timeout configured on the server side, the lock will be released automatically by the server and any further attempts to use it will yield an {@link UnknownRowLockException}.

Examples of org.apache.hadoop.hbase.regionserver.HRegion.RowLock

      }


      metricsAssertHelper.assertCounter("syncTimeNumOps", syncs + 2, source);


      LOG.info("Next a batch put that has to break into two batches to avoid a lock");
      RowLock rowLock = region.getRowLock(Bytes.toBytes("row_2"));


      MultithreadedTestUtil.TestContext ctx = new MultithreadedTestUtil.TestContext(conf);
      final AtomicReference<OperationStatus[]> retFromThread = new AtomicReference<OperationStatus[]>();
      TestThread putter = new TestThread(ctx) {
        @Override
        public void doWork() throws IOException {
          retFromThread.set(region.batchMutate(puts));
        }
      };
      LOG.info("...starting put thread while holding lock");
      ctx.addThread(putter);
      ctx.startThreads();


      LOG.info("...waiting for put thread to sync first time");
      long startWait = System.currentTimeMillis();
      while (metricsAssertHelper.getCounter("syncTimeNumOps", source) == syncs + 2) {
        Thread.sleep(100);
        if (System.currentTimeMillis() - startWait > 10000) {
          fail("Timed out waiting for thread to sync first minibatch");
        }
      }
      LOG.info("...releasing row lock, which should let put thread continue");
      rowLock.release();
      LOG.info("...joining on thread");
      ctx.stop();
      LOG.info("...checking that next batch was synced");
      metricsAssertHelper.assertCounter("syncTimeNumOps", syncs + 4, source);
      codes = retFromThread.get();

View Full Code Here

Examples of org.apache.hadoop.hbase.regionserver.HRegion.RowLock

      }


      metricsAssertHelper.assertCounter("syncTimeNumOps", syncs + 2, source);


      LOG.info("Next a batch put that has to break into two batches to avoid a lock");
      RowLock rowLock = region.getRowLock(Bytes.toBytes("row_2"));


      MultithreadedTestUtil.TestContext ctx = new MultithreadedTestUtil.TestContext(CONF);
      final AtomicReference<OperationStatus[]> retFromThread = new AtomicReference<OperationStatus[]>();
      TestThread putter = new TestThread(ctx) {
        @Override
        public void doWork() throws IOException {
          retFromThread.set(region.batchMutate(puts));
        }
      };
      LOG.info("...starting put thread while holding lock");
      ctx.addThread(putter);
      ctx.startThreads();


      LOG.info("...waiting for put thread to sync first time");
      long startWait = System.currentTimeMillis();
      while (metricsAssertHelper.getCounter("syncTimeNumOps", source) == syncs + 2) {
        Thread.sleep(100);
        if (System.currentTimeMillis() - startWait > 10000) {
          fail("Timed out waiting for thread to sync first minibatch");
        }
      }
      LOG.info("...releasing row lock, which should let put thread continue");
      rowLock.release();
      LOG.info("...joining on thread");
      ctx.stop();
      LOG.info("...checking that next batch was synced");
      metricsAssertHelper.assertCounter("syncTimeNumOps", syncs + 4, source);
      codes = retFromThread.get();

View Full Code Here

Examples of org.apache.hadoop.hbase.regionserver.HRegion.RowLock

      }


      metricsAssertHelper.assertCounter("syncTimeNumOps", syncs + 2, source);


      LOG.info("Next a batch put that has to break into two batches to avoid a lock");
      RowLock rowLock = region.getRowLock(Bytes.toBytes("row_2"));


      MultithreadedTestUtil.TestContext ctx =
        new MultithreadedTestUtil.TestContext(conf);
      final AtomicReference<OperationStatus[]> retFromThread =
        new AtomicReference<OperationStatus[]>();
      TestThread putter = new TestThread(ctx) {
        @Override
        public void doWork() throws IOException {
          retFromThread.set(region.batchMutate(puts));
        }
      };
      LOG.info("...starting put thread while holding lock");
      ctx.addThread(putter);
      ctx.startThreads();


      LOG.info("...waiting for put thread to sync first time");
      long startWait = System.currentTimeMillis();
      while (metricsAssertHelper.getCounter("syncTimeNumOps", source) == syncs +2 ) {
        Thread.sleep(100);
        if (System.currentTimeMillis() - startWait > 10000) {
          fail("Timed out waiting for thread to sync first minibatch");
        }
      }
      LOG.info("...releasing row lock, which should let put thread continue");
      rowLock.release();
      LOG.info("...joining on thread");
      ctx.stop();
      LOG.info("...checking that next batch was synced");
      metricsAssertHelper.assertCounter("syncTimeNumOps", syncs + 4, source);
      codes = retFromThread.get();

View Full Code Here

Examples of org.apache.hadoop.hbase.regionserver.HRegion.RowLock

      }


      metricsAssertHelper.assertCounter("syncTimeNumOps", syncs + 2, source);


      LOG.info("Next a batch put that has to break into two batches to avoid a lock");
      RowLock rowLock = region.getRowLock(Bytes.toBytes("row_2"));


      MultithreadedTestUtil.TestContext ctx = new MultithreadedTestUtil.TestContext(CONF);
      final AtomicReference<OperationStatus[]> retFromThread = new AtomicReference<OperationStatus[]>();
      TestThread putter = new TestThread(ctx) {
        @Override
        public void doWork() throws IOException {
          retFromThread.set(region.batchMutate(puts));
        }
      };
      LOG.info("...starting put thread while holding lock");
      ctx.addThread(putter);
      ctx.startThreads();


      LOG.info("...waiting for put thread to sync first time");
      long startWait = System.currentTimeMillis();
      while (metricsAssertHelper.getCounter("syncTimeNumOps", source) == syncs + 2) {
        Thread.sleep(100);
        if (System.currentTimeMillis() - startWait > 10000) {
          fail("Timed out waiting for thread to sync first minibatch");
        }
      }
      LOG.info("...releasing row lock, which should let put thread continue");
      rowLock.release();
      LOG.info("...joining on thread");
      ctx.stop();
      LOG.info("...checking that next batch was synced");
      metricsAssertHelper.assertCounter("syncTimeNumOps", syncs + 4, source);
      codes = retFromThread.get();

View Full Code Here

Examples of org.apache.hadoop.hbase.regionserver.HRegion.RowLock

      }


      metricsAssertHelper.assertCounter("syncTimeNumOps", syncs + 2, source);


      LOG.info("Next a batch put that has to break into two batches to avoid a lock");
      RowLock rowLock = region.getRowLock(Bytes.toBytes("row_2"));


      MultithreadedTestUtil.TestContext ctx = new MultithreadedTestUtil.TestContext(CONF);
      final AtomicReference<OperationStatus[]> retFromThread = new AtomicReference<OperationStatus[]>();
      TestThread putter = new TestThread(ctx) {
        @Override
        public void doWork() throws IOException {
          retFromThread.set(region.batchMutate(puts));
        }
      };
      LOG.info("...starting put thread while holding lock");
      ctx.addThread(putter);
      ctx.startThreads();


      LOG.info("...waiting for put thread to sync first time");
      long startWait = System.currentTimeMillis();
      while (metricsAssertHelper.getCounter("syncTimeNumOps", source) == syncs + 2) {
        Thread.sleep(100);
        if (System.currentTimeMillis() - startWait > 10000) {
          fail("Timed out waiting for thread to sync first minibatch");
        }
      }
      LOG.info("...releasing row lock, which should let put thread continue");
      rowLock.release();
      LOG.info("...joining on thread");
      ctx.stop();
      LOG.info("...checking that next batch was synced");
      metricsAssertHelper.assertCounter("syncTimeNumOps", syncs + 4, source);
      codes = retFromThread.get();

View Full Code Here

Examples of org.apache.hadoop.hbase.regionserver.HRegion.RowLock

      }


      metricsAssertHelper.assertCounter("syncTimeNumOps", syncs + 2, source);


      LOG.info("Next a batch put that has to break into two batches to avoid a lock");
      RowLock rowLock = region.getRowLock(Bytes.toBytes("row_2"));


      MultithreadedTestUtil.TestContext ctx = new MultithreadedTestUtil.TestContext(CONF);
      final AtomicReference<OperationStatus[]> retFromThread = new AtomicReference<OperationStatus[]>();
      TestThread putter = new TestThread(ctx) {
        @Override
        public void doWork() throws IOException {
          retFromThread.set(region.batchMutate(puts));
        }
      };
      LOG.info("...starting put thread while holding lock");
      ctx.addThread(putter);
      ctx.startThreads();


      LOG.info("...waiting for put thread to sync first time");
      long startWait = System.currentTimeMillis();
      while (metricsAssertHelper.getCounter("syncTimeNumOps", source) == syncs + 2) {
        Thread.sleep(100);
        if (System.currentTimeMillis() - startWait > 10000) {
          fail("Timed out waiting for thread to sync first minibatch");
        }
      }
      LOG.info("...releasing row lock, which should let put thread continue");
      rowLock.release();
      LOG.info("...joining on thread");
      ctx.stop();
      LOG.info("...checking that next batch was synced");
      metricsAssertHelper.assertCounter("syncTimeNumOps", syncs + 4, source);
      codes = retFromThread.get();

View Full Code Here

Examples of org.apache.hadoop.hbase.regionserver.HRegion.RowLock

      }


      metricsAssertHelper.assertCounter("syncTimeNumOps", syncs + 2, source);


      LOG.info("Next a batch put that has to break into two batches to avoid a lock");
      RowLock rowLock = region.getRowLock(Bytes.toBytes("row_2"));


      MultithreadedTestUtil.TestContext ctx = new MultithreadedTestUtil.TestContext(CONF);
      final AtomicReference<OperationStatus[]> retFromThread = new AtomicReference<OperationStatus[]>();
      TestThread putter = new TestThread(ctx) {
        @Override
        public void doWork() throws IOException {
          retFromThread.set(region.batchMutate(puts));
        }
      };
      LOG.info("...starting put thread while holding lock");
      ctx.addThread(putter);
      ctx.startThreads();


      LOG.info("...waiting for put thread to sync first time");
      long startWait = System.currentTimeMillis();
      while (metricsAssertHelper.getCounter("syncTimeNumOps", source) == syncs + 2) {
        Thread.sleep(100);
        if (System.currentTimeMillis() - startWait > 10000) {
          fail("Timed out waiting for thread to sync first minibatch");
        }
      }
      LOG.info("...releasing row lock, which should let put thread continue");
      rowLock.release();
      LOG.info("...joining on thread");
      ctx.stop();
      LOG.info("...checking that next batch was synced");
      metricsAssertHelper.assertCounter("syncTimeNumOps", syncs + 4, source);
      codes = retFromThread.get();

View Full Code Here

Examples of org.hbase.async.RowLock

  }


  private static final class cas implements Cmd {
    public void execute(final HBaseClient client, String[] args) throws Exception {
      ensureArguments(args, 8, 8);
      RowLock lock = null;
      if (args[1].charAt(0) == 'l') {  // locked version of the command
        final RowLockRequest rlr = new RowLockRequest(args[2], args[3]);
        lock = client.lockRow(rlr).joinUninterruptibly();
        LOG.info("Acquired explicit row lock: " + lock);
      }

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Examples of org.hbase.async.RowLock

            qualifiers[i - 5] = args[i].getBytes();
          }
          get.qualifiers(qualifiers);
        }
      }
      RowLock lock = null;
      if (args[1].charAt(0) == 'l') {  // locked version of the command
        final RowLockRequest rlr = new RowLockRequest(args[2], args[3]);
        lock = client.lockRow(rlr).joinUninterruptibly();
        LOG.info("Acquired explicit row lock: " + lock);
      }

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Examples of org.hbase.async.RowLock

  }


  private static final class put implements Cmd {
    public void execute(final HBaseClient client, String[] args) throws Exception {
      ensureArguments(args, 7, 7);
      RowLock lock = null;
      if (args[1].charAt(0) == 'l') {  // locked version of the command
        final RowLockRequest rlr = new RowLockRequest(args[2], args[3]);
        lock = client.lockRow(rlr).joinUninterruptibly();
        LOG.info("Acquired explicit row lock: " + lock);
      }

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