org.apache.curator.RetryLoop Java Examples

The following examples show how to use org.apache.curator.RetryLoop. You can vote up the ones you like or vote down the ones you don't like, and go to the original project or source file by following the links above each example. You may check out the related API usage on the sidebar.

Example #1

Source File: SetDataBuilderImpl.java From xian with Apache License 2.0

6 votes

private Stat pathInForeground(final String path, final byte[] data) throws Exception
{
    OperationTrace   trace = client.getZookeeperClient().startAdvancedTracer("SetDataBuilderImpl-Foreground");
    Stat        resultStat = RetryLoop.callWithRetry
    (
        client.getZookeeperClient(),
        new Callable<Stat>()
        {
            @Override
            public Stat call() throws Exception
            {
                return client.getZooKeeper().setData(path, data, version);
            }
        }
    );
    trace.setRequestBytesLength(data).setPath(path).setStat(resultStat).commit();
    return resultStat;
}

Example #2

Source File: TempGetDataBuilderImpl.java From curator with Apache License 2.0

6 votes

@Override
public byte[] forPath(String path) throws Exception
{
    final String    localPath = client.fixForNamespace(path);

    OperationTrace       trace = client.getZookeeperClient().startAdvancedTracer("GetDataBuilderImpl-Foreground");
    byte[]          responseData = RetryLoop.callWithRetry
    (
        client.getZookeeperClient(),
        new Callable<byte[]>()
        {
            @Override
            public byte[] call() throws Exception
            {
                return client.getZooKeeper().getData(localPath, false, responseStat);
            }
        }
    );
    trace.setResponseBytesLength(responseData).setPath(path).setStat(responseStat).commit();

    return decompress ? client.getCompressionProvider().decompress(path, responseData) : responseData;
}

Example #3

Source File: CuratorMultiTransactionImpl.java From curator with Apache License 2.0

6 votes

private List<CuratorTransactionResult> forOperationsInForeground(final CuratorMultiTransactionRecord record) throws Exception
{
    TimeTrace trace = client.getZookeeperClient().startTracer("CuratorMultiTransactionImpl-Foreground");
    List<OpResult> responseData = RetryLoop.callWithRetry
    (
        client.getZookeeperClient(),
        new Callable<List<OpResult>>()
        {
            @Override
            public List<OpResult> call() throws Exception
            {
                return client.getZooKeeper().multi(record);
            }
        }
    );
    trace.commit();

    return CuratorTransactionImpl.wrapResults(client, responseData, record);
}

Example #4

Source File: S3BackupProvider.java From exhibitor with Apache License 2.0

6 votes

private PartETag uploadChunkWithRetry(byte[] buffer, int bytesRead, InitiateMultipartUploadResult initResponse, int index, RetryPolicy retryPolicy) throws Exception
{
    long            startMs = System.currentTimeMillis();
    int             retries = 0;
    for(;;)
    {
        try
        {
            return uploadChunk(buffer, bytesRead, initResponse, index);
        }
        catch ( Exception e )
        {
            if ( !retryPolicy.allowRetry(retries++, System.currentTimeMillis() - startMs, RetryLoop.getDefaultRetrySleeper()) )
            {
                throw e;
            }
        }
    }
}

Example #5

Source File: SetDataBuilderImpl.java From curator with Apache License 2.0

6 votes

private Stat pathInForeground(final String path, final byte[] data) throws Exception
{
    OperationTrace   trace = client.getZookeeperClient().startAdvancedTracer("SetDataBuilderImpl-Foreground");
    Stat        resultStat = RetryLoop.callWithRetry
    (
        client.getZookeeperClient(),
        new Callable<Stat>()
        {
            @Override
            public Stat call() throws Exception
            {
                return client.getZooKeeper().setData(path, data, version);
            }
        }
    );
    trace.setRequestBytesLength(data).setPath(path).setStat(resultStat).commit();
    return resultStat;
}

Example #6

Source File: GetACLBuilderImpl.java From xian with Apache License 2.0

6 votes

private List<ACL> pathInForeground(final String path) throws Exception
{
    OperationTrace    trace = client.getZookeeperClient().startAdvancedTracer("GetACLBuilderImpl-Foreground");
    List<ACL>    result = RetryLoop.callWithRetry
    (
        client.getZookeeperClient(),
        new Callable<List<ACL>>()
        {
            @Override
            public List<ACL> call() throws Exception
            {
                return client.getZooKeeper().getACL(path, responseStat);
            }
        }
    );
    trace.setPath(path).setStat(responseStat).commit();
    return result;
}

Example #7

Source File: SetACLBuilderImpl.java From xian with Apache License 2.0

6 votes

private Stat pathInForeground(final String path) throws Exception
{
    OperationTrace   trace = client.getZookeeperClient().startAdvancedTracer("SetACLBuilderImpl-Foreground");
    Stat        resultStat = RetryLoop.callWithRetry
    (
        client.getZookeeperClient(),
        new Callable<Stat>()
        {
            @Override
            public Stat call() throws Exception
            {
                return client.getZooKeeper().setACL(path, acling.getAclList(path), version);
            }
        }
    );
    trace.setPath(path).setStat(resultStat).commit();
    return resultStat;
}

Example #8

Source File: ReconfigBuilderImpl.java From curator with Apache License 2.0

6 votes

private byte[] ensembleInForeground() throws Exception
{
    TimeTrace trace = client.getZookeeperClient().startTracer("ReconfigBuilderImpl-Foreground");
    byte[] responseData = RetryLoop.callWithRetry
        (
            client.getZookeeperClient(),
            new Callable<byte[]>()
            {
                @Override
                public byte[] call() throws Exception
                {
                    return ((ZooKeeperAdmin)client.getZooKeeper()).reconfigure(joining, leaving, newMembers, fromConfig, responseStat);
                }
            }
        );
    trace.commit();
    return responseData;
}

Example #9

Source File: CuratorTransactionImpl.java From curator with Apache License 2.0

6 votes

@Override
public Collection<CuratorTransactionResult> commit() throws Exception
{
    Preconditions.checkState(!isCommitted, "transaction already committed");
    isCommitted = true;

    List<OpResult> resultList = RetryLoop.callWithRetry
        (
            client.getZookeeperClient(),
            new Callable<List<OpResult>>()
            {
                @Override
                public List<OpResult> call() throws Exception
                {
                    return doOperation();
                }
            }
        );

    if ( resultList.size() != transaction.metadataSize() )
    {
        throw new IllegalStateException(String.format("Result size (%d) doesn't match input size (%d)", resultList.size(), transaction.metadataSize()));
    }

    return wrapResults(client, resultList, transaction);
}

Example #10

Source File: SetACLBuilderImpl.java From curator with Apache License 2.0

6 votes

private Stat pathInForeground(final String path, final List<ACL> aclList) throws Exception
{
    OperationTrace   trace = client.getZookeeperClient().startAdvancedTracer("SetACLBuilderImpl-Foreground");
    Stat        resultStat = RetryLoop.callWithRetry
    (
        client.getZookeeperClient(),
        new Callable<Stat>()
        {
            @Override
            public Stat call() throws Exception
            {
                return client.getZooKeeper().setACL(path, aclList, version);
            }
        }
    );
    trace.setPath(path).setStat(resultStat).commit();
    return resultStat;
}

Example #11

Source File: AddWatchBuilderImpl.java From curator with Apache License 2.0

6 votes

private void pathInForeground(final String path) throws Exception
{
    final String fixedPath = client.fixForNamespace(path);
    OperationTrace trace = client.getZookeeperClient().startAdvancedTracer("AddWatchBuilderImpl-Foreground");
    RetryLoop.callWithRetry
    (
        client.getZookeeperClient(), () -> {
            if ( watching.isWatched() )
            {
                client.getZooKeeper().addWatch(fixedPath, mode);
            }
            else
            {
                client.getZooKeeper().addWatch(fixedPath, watching.getWatcher(path), mode);
            }
            return null;
        });
    trace.setPath(fixedPath).setWithWatcher(true).commit();
}

Example #12

Source File: TempGetDataBuilderImpl.java From xian with Apache License 2.0

6 votes

@Override
public byte[] forPath(String path) throws Exception
{
    final String    localPath = client.fixForNamespace(path);

    OperationTrace       trace = client.getZookeeperClient().startAdvancedTracer("GetDataBuilderImpl-Foreground");
    byte[]          responseData = RetryLoop.callWithRetry
    (
        client.getZookeeperClient(),
        new Callable<byte[]>()
        {
            @Override
            public byte[] call() throws Exception
            {
                return client.getZooKeeper().getData(localPath, false, responseStat);
            }
        }
    );
    trace.setResponseBytesLength(responseData).setPath(path).setStat(responseStat).commit();

    return decompress ? client.getCompressionProvider().decompress(path, responseData) : responseData;
}

Example #13

Source File: GetACLBuilderImpl.java From curator with Apache License 2.0

6 votes

private List<ACL> pathInForeground(final String path) throws Exception
{
    OperationTrace    trace = client.getZookeeperClient().startAdvancedTracer("GetACLBuilderImpl-Foreground");
    List<ACL>    result = RetryLoop.callWithRetry
    (
        client.getZookeeperClient(),
        new Callable<List<ACL>>()
        {
            @Override
            public List<ACL> call() throws Exception
            {
                return client.getZooKeeper().getACL(path, responseStat);
            }
        }
    );
    trace.setPath(path).setStat(responseStat).commit();
    return result;
}

Example #14

Source File: DistributedAtomicValue.java From curator with Apache License 2.0

6 votes

private void tryOptimistic(MutableAtomicValue<byte[]> result, MakeValue makeValue) throws Exception
{
    long            startMs = System.currentTimeMillis();
    int             retryCount = 0;

    boolean         done = false;
    while ( !done )
    {
        result.stats.incrementOptimisticTries();
        if ( tryOnce(result, makeValue) )
        {
            result.succeeded = true;
            done = true;
        }
        else
        {
            if ( !retryPolicy.allowRetry(retryCount++, System.currentTimeMillis() - startMs, RetryLoop.getDefaultRetrySleeper()) )
            {
                done = true;
            }
        }
    }

    result.stats.setOptimisticTimeMs(System.currentTimeMillis() - startMs);
}

Example #15

Source File: CreateBuilderImpl.java From xian with Apache License 2.0

6 votes

static <T> void backgroundCreateParentsThenNode(final CuratorFrameworkImpl client, final OperationAndData<T> mainOperationAndData, final String path, Backgrounding backgrounding, final boolean createParentsAsContainers)
{
    BackgroundOperation<T> operation = new BackgroundOperation<T>()
    {
        @Override
        public void performBackgroundOperation(OperationAndData<T> dummy) throws Exception
        {
            try
            {
                ZKPaths.mkdirs(client.getZooKeeper(), path, false, client.getAclProvider(), createParentsAsContainers);
            }
            catch ( KeeperException e )
            {
                if ( !RetryLoop.isRetryException(e) )
                {
                    throw e;
                }
                // otherwise safe to ignore as it will get retried
            }
            client.queueOperation(mainOperationAndData);
        }
    };
    OperationAndData<T> parentOperation = new OperationAndData<T>(operation, mainOperationAndData.getData(), null, null, backgrounding.getContext());
    client.queueOperation(parentOperation);
}

Example #16

Source File: TestThreadLocalRetryLoop.java From curator with Apache License 2.0

6 votes

private Void doOperation(CuratorFramework client) throws Exception
{
    try
    {
        RetryLoop.callWithRetry(client.getZookeeperClient(), () -> {
            client.checkExists().forPath("/hey");
            return null;
        });
        Assert.fail("Should have thrown an exception");
    }
    catch ( KeeperException dummy )
    {
        // correct
    }
    return null;
}

Example #17

Source File: EnsurePath.java From xian with Apache License 2.0

6 votes

@Override
public synchronized void ensure(final CuratorZookeeperClient client, final String path, final boolean makeLastNode) throws Exception
{
    if ( !isSet )
    {
        RetryLoop.callWithRetry
            (
                client,
                new Callable<Object>()
                {
                    @Override
                    public Object call() throws Exception
                    {
                        ZKPaths.mkdirs(client.getZooKeeper(), path, makeLastNode, aclProvider, asContainers());
                        helper.set(doNothingHelper);
                        isSet = true;
                        return null;
                    }
                }
            );
    }
}

Example #18

Source File: EnsurePath.java From curator with Apache License 2.0

6 votes

@Override
public synchronized void ensure(final CuratorZookeeperClient client, final String path, final boolean makeLastNode) throws Exception
{
    if ( !isSet )
    {
        RetryLoop.callWithRetry
            (
                client,
                new Callable<Object>()
                {
                    @Override
                    public Object call() throws Exception
                    {
                        ZKPaths.mkdirs(client.getZooKeeper(), path, makeLastNode, aclProvider, asContainers());
                        helper.set(doNothingHelper);
                        isSet = true;
                        return null;
                    }
                }
            );
    }
}

Example #19

Source File: DistributedAtomicValue.java From xian with Apache License 2.0

6 votes

private void tryOptimistic(MutableAtomicValue<byte[]> result, MakeValue makeValue) throws Exception
{
    long            startMs = System.currentTimeMillis();
    int             retryCount = 0;

    boolean         done = false;
    while ( !done )
    {
        result.stats.incrementOptimisticTries();
        if ( tryOnce(result, makeValue) )
        {
            result.succeeded = true;
            done = true;
        }
        else
        {
            if ( !retryPolicy.allowRetry(retryCount++, System.currentTimeMillis() - startMs, RetryLoop.getDefaultRetrySleeper()) )
            {
                done = true;
            }
        }
    }

    result.stats.setOptimisticTimeMs(System.currentTimeMillis() - startMs);
}

Example #20

Source File: MasterRespondsWithNoZkTest.java From helios with Apache License 2.0

5 votes

@Override
public CuratorFramework newClient(final String connectString, final int sessionTimeoutMs,
                                  final int connectionTimeoutMs, final RetryPolicy retryPolicy,
                                  final ACLProvider aclProvider,
                                  final List<AuthInfo> authorization) {
  final CuratorFramework curator = mock(CuratorFramework.class);

  final RetryLoop retryLoop = mock(RetryLoop.class);
  when(retryLoop.shouldContinue()).thenReturn(false);

  final CuratorZookeeperClient czkClient = mock(CuratorZookeeperClient.class);
  when(czkClient.newRetryLoop()).thenReturn(retryLoop);

  when(curator.getZookeeperClient()).thenReturn(czkClient);

  @SuppressWarnings("unchecked") final Listenable<ConnectionStateListener> mockListener =
      (Listenable<ConnectionStateListener>) mock(Listenable.class);

  when(curator.getConnectionStateListenable()).thenReturn(mockListener);

  final GetChildrenBuilder builder = mock(GetChildrenBuilder.class);
  when(curator.getChildren()).thenReturn(builder);

  try {
    when(builder.forPath(anyString())).thenThrow(
        new KeeperException.ConnectionLossException());
  } catch (Exception ignored) {
    // never throws
  }
  when(curator.newNamespaceAwareEnsurePath(anyString())).thenReturn(mock(EnsurePath.class));

  return curator;
}

Example #21

Source File: DistributedAtomicValue.java From curator with Apache License 2.0

5 votes

private void tryWithMutex(MutableAtomicValue<byte[]> result, MakeValue makeValue) throws Exception
 {
     long            startMs = System.currentTimeMillis();
     int             retryCount = 0;

     if ( mutex.acquire(promotedToLock.getMaxLockTime(), promotedToLock.getMaxLockTimeUnit()) )
     {
         try
         {
             boolean         done = false;
             while ( !done )
             {
                 result.stats.incrementPromotedTries();
                 if ( tryOnce(result, makeValue) )
                 {
                     result.succeeded = true;
                     done = true;
                 }
                 else
                 {
                     if ( !promotedToLock.getRetryPolicy().allowRetry(retryCount++, System.currentTimeMillis() - startMs, RetryLoop.getDefaultRetrySleeper()) )
                     {
                         done = true;
                     }
                 }
             }
         }
         finally
         {
             mutex.release();
         }
     }

     result.stats.setPromotedTimeMs(System.currentTimeMillis() - startMs);
}

Example #22

Source File: NamespaceImpl.java From curator with Apache License 2.0

5 votes

String    fixForNamespace(String path, boolean isSequential)
{
    if ( ensurePathNeeded.get() )
    {
        try
        {
            final CuratorZookeeperClient zookeeperClient = client.getZookeeperClient();
            RetryLoop.callWithRetry
            (
                zookeeperClient,
                new Callable<Object>()
                {
                    @Override
                    public Object call() throws Exception
                    {
                        ZKPaths.mkdirs(zookeeperClient.getZooKeeper(), ZKPaths.makePath("/", namespace), true, client.getAclProvider(), true);
                        return null;
                    }
                }
            );
            ensurePathNeeded.set(false);
        }
        catch ( Exception e )
        {
            ThreadUtils.checkInterrupted(e);
            client.logError("Ensure path threw exception", e);
        }
    }

    return ZKPaths.fixForNamespace(namespace, path, isSequential);
}

Example #23

Source File: ThreadLocalRetryLoop.java From curator with Apache License 2.0

5 votes

/**
 * Call to get the current retry loop. If there isn't one, one is allocated
 * via {@code newRetryLoopSupplier}.
 *
 * @param newRetryLoopSupplier supply a new retry loop when needed. Normally you should use {@link org.apache.curator.CuratorZookeeperClient#newRetryLoop()}
 * @return retry loop to use
 */
public RetryLoop getRetryLoop(Supplier<RetryLoop> newRetryLoopSupplier)
{
    Entry entry = threadLocal.get();
    if ( entry == null )
    {
        entry = new Entry(new WrappedRetryLoop(newRetryLoopSupplier.get()));
        threadLocal.set(entry);
    }
    ++entry.counter;
    return entry.retryLoop;
}

Example #24

Source File: DistributedAtomicValue.java From xian with Apache License 2.0

5 votes

private void tryWithMutex(MutableAtomicValue<byte[]> result, MakeValue makeValue) throws Exception
 {
     long            startMs = System.currentTimeMillis();
     int             retryCount = 0;

     if ( mutex.acquire(promotedToLock.getMaxLockTime(), promotedToLock.getMaxLockTimeUnit()) )
     {
         try
         {
             boolean         done = false;
             while ( !done )
             {
                 result.stats.incrementPromotedTries();
                 if ( tryOnce(result, makeValue) )
                 {
                     result.succeeded = true;
                     done = true;
                 }
                 else
                 {
                     if ( !promotedToLock.getRetryPolicy().allowRetry(retryCount++, System.currentTimeMillis() - startMs, RetryLoop.getDefaultRetrySleeper()) )
                     {
                         done = true;
                     }
                 }
             }
         }
         finally
         {
             mutex.release();
         }
     }

     result.stats.setPromotedTimeMs(System.currentTimeMillis() - startMs);
}

Example #25

Source File: CreateBuilderImpl.java From curator with Apache License 2.0

5 votes

private String findProtectedNodeInForeground(final String path) throws Exception
{
    OperationTrace trace = client.getZookeeperClient().startAdvancedTracer("CreateBuilderImpl-findProtectedNodeInForeground");

    String returnPath = RetryLoop.callWithRetry
        (
            client.getZookeeperClient(),
            new Callable<String>()
            {
                @Override
                public String call() throws Exception
                {
                    String foundNode = null;
                    try
                    {
                        final ZKPaths.PathAndNode pathAndNode = ZKPaths.getPathAndNode(path);
                        List<String> children = client.getZooKeeper().getChildren(pathAndNode.getPath(), false);

                        foundNode = findNode(children, pathAndNode.getPath(), protectedMode.protectedId());
                        log.debug("Protected mode findNode result: {}", foundNode);

                        foundNode = protectedMode.validateFoundNode(client, createMode, foundNode);
                    }
                    catch ( KeeperException.NoNodeException ignore )
                    {
                        // ignore
                    }
                    return foundNode;
                }
            }
        );

    trace.setPath(path).commit();
    return returnPath;
}

Example #26

Source File: CuratorTransactionImpl.java From xian with Apache License 2.0

5 votes

@Override
public Collection<CuratorTransactionResult> commit() throws Exception
{
    Preconditions.checkState(!isCommitted, "transaction already committed");
    isCommitted = true;

    final AtomicBoolean firstTime = new AtomicBoolean(true);
    List<OpResult>      resultList = RetryLoop.callWithRetry
    (
        client.getZookeeperClient(),
        new Callable<List<OpResult>>()
        {
            @Override
            public List<OpResult> call() throws Exception
            {
                return doOperation(firstTime);
            }
        }
    );
    
    if ( resultList.size() != transaction.metadataSize() )
    {
        throw new IllegalStateException(String.format("Result size (%d) doesn't match input size (%d)", resultList.size(), transaction.metadataSize()));
    }

    ImmutableList.Builder<CuratorTransactionResult>     builder = ImmutableList.builder();
    for ( int i = 0; i < resultList.size(); ++i )
    {
        OpResult                                    opResult = resultList.get(i);
        CuratorMultiTransactionRecord.TypeAndPath   metadata = transaction.getMetadata(i);
        CuratorTransactionResult                    curatorResult = makeCuratorResult(opResult, metadata);
        builder.add(curatorResult);
    }

    return builder.build();
}

Example #27

Source File: NamespaceImpl.java From xian with Apache License 2.0

5 votes

String    fixForNamespace(String path, boolean isSequential)
{
    if ( ensurePathNeeded.get() )
    {
        try
        {
            final CuratorZookeeperClient zookeeperClient = client.getZookeeperClient();
            RetryLoop.callWithRetry
            (
                zookeeperClient,
                new Callable<Object>()
                {
                    @Override
                    public Object call() throws Exception
                    {
                        ZKPaths.mkdirs(zookeeperClient.getZooKeeper(), ZKPaths.makePath("/", namespace), true, client.getAclProvider(), true);
                        return null;
                    }
                }
            );
            ensurePathNeeded.set(false);
        }
        catch ( Exception e )
        {
            ThreadUtils.checkInterrupted(e);
            client.logError("Ensure path threw exception", e);
        }
    }

    return ZKPaths.fixForNamespace(namespace, path, isSequential);
}

Example #28

Source File: CuratorFrameworkImpl.java From xian with Apache License 2.0

5 votes

private <DATA_TYPE> void handleBackgroundOperationException(OperationAndData<DATA_TYPE> operationAndData, Throwable e)
{
    do
    {
        if ( (operationAndData != null) && RetryLoop.isRetryException(e) )
        {
            if ( !Boolean.getBoolean(DebugUtils.PROPERTY_DONT_LOG_CONNECTION_ISSUES) )
            {
                log.debug("Retry-able exception received", e);
            }
            if ( client.getRetryPolicy().allowRetry(operationAndData.getThenIncrementRetryCount(), operationAndData.getElapsedTimeMs(), operationAndData) )
            {
                if ( !Boolean.getBoolean(DebugUtils.PROPERTY_DONT_LOG_CONNECTION_ISSUES) )
                {
                    log.debug("Retrying operation");
                }
                backgroundOperations.offer(operationAndData);
                break;
            }
            else
            {
                if ( !Boolean.getBoolean(DebugUtils.PROPERTY_DONT_LOG_CONNECTION_ISSUES) )
                {
                    log.debug("Retry policy did not allow retry");
                }
                if ( operationAndData.getErrorCallback() != null )
                {
                    operationAndData.getErrorCallback().retriesExhausted(operationAndData);
                }
            }
        }

        logError("Background exception was not retry-able or retry gave up", e);
    }
    while ( false );
}

Example #29

Source File: CuratorFrameworkImpl.java From xian with Apache License 2.0

5 votes

<DATA_TYPE> void processBackgroundOperation(OperationAndData<DATA_TYPE> operationAndData, CuratorEvent event)
{
    boolean isInitialExecution = (event == null);
    if ( isInitialExecution )
    {
        performBackgroundOperation(operationAndData);
        return;
    }

    boolean doQueueOperation = false;
    do
    {
        if ( RetryLoop.shouldRetry(event.getResultCode()) )
        {
            doQueueOperation = checkBackgroundRetry(operationAndData, event);
            break;
        }

        if ( operationAndData.getCallback() != null )
        {
            sendToBackgroundCallback(operationAndData, event);
            break;
        }

        processEvent(event);
    }
    while ( false );

    if ( doQueueOperation )
    {
        queueOperation(operationAndData);
    }
}

Example #30

Source File: GetConfigBuilderImpl.java From curator with Apache License 2.0

5 votes

private byte[] configInForeground() throws Exception
{
    TimeTrace trace = client.getZookeeperClient().startTracer("GetConfigBuilderImpl-Foreground");
    try
    {
        return RetryLoop.callWithRetry
        (
            client.getZookeeperClient(),
            new Callable<byte[]>()
            {
                @Override
                public byte[] call() throws Exception
                {
                    if ( watching.isWatched() )
                    {
                        return client.getZooKeeper().getConfig(true, stat);
                    }
                    byte[] config = client.getZooKeeper().getConfig(watching.getWatcher(ZooDefs.CONFIG_NODE), stat);
                    watching.commitWatcher(KeeperException.NoNodeException.Code.OK.intValue(), false);
                    return config;
                }
            }
        );
    }
    finally
    {
        trace.commit();
    }
}