Examples of org.apache.hadoop.hbase.util.RetryCounter$ExponentialBackoffPolicyWithLimit

org.apache.hadoop.hbase.util.RetryCounter
Policy for calculating sleeping intervals between retry attempts

  }
  
  private String createSequential(String path, byte[] data, 
      List<ACL> acl, CreateMode createMode)
  throws KeeperException, InterruptedException {
    RetryCounter retryCounter = retryCounterFactory.create();
    boolean first = true;
    String newPath = path+this.identifier;
    while (true) {
      try {
        if (!first) {
          // Check if we succeeded on a previous attempt
          String previousResult = findPreviousSequentialNode(newPath);
          if (previousResult != null) {
            return previousResult;
          }
        }
        first = false;
        return checkZk().create(newPath, data, acl, createMode);
      } catch (KeeperException e) {
        switch (e.code()) {
          case CONNECTIONLOSS:
          case SESSIONEXPIRED:
          case OPERATIONTIMEOUT:
            retryOrThrow(retryCounter, e, "create");
            break;


          default:
            throw e;
        }
      }
      retryCounter.sleepUntilNextRetry();
      retryCounter.useRetry();
    }
  }

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  /**
   * Run multiple operations in a transactional manner. Retry before throwing exception
   */
  public List<OpResult> multi(Iterable<Op> ops)
  throws KeeperException, InterruptedException {
    RetryCounter retryCounter = retryCounterFactory.create();
    Iterable<Op> multiOps = prepareZKMulti(ops);
    while (true) {
      try {
        return checkZk().multi(multiOps);
      } catch (KeeperException e) {
        switch (e.code()) {
          case CONNECTIONLOSS:
          case SESSIONEXPIRED:
          case OPERATIONTIMEOUT:
            retryOrThrow(retryCounter, e, "multi");
            break;


          default:
            throw e;
        }
      }
      retryCounter.sleepUntilNextRetry();
      retryCounter.useRetry();
    }
  }

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    LOG.debug("FirstRow=" + Bytes.toString(firstrow));
    long pause = getConfiguration().getLong(HConstants.HBASE_CLIENT_PAUSE,
      HConstants.DEFAULT_HBASE_CLIENT_PAUSE);
    int numRetries = getConfiguration().getInt(HConstants.HBASE_CLIENT_RETRIES_NUMBER,
      HConstants.DEFAULT_HBASE_CLIENT_RETRIES_NUMBER);
    RetryCounter retrier = new RetryCounter(numRetries, (int)pause, TimeUnit.MICROSECONDS);
    while(retrier.shouldRetry()) {
      int index = getMiniHBaseCluster().getServerWith(firstrow);
      if (index != -1) {
        return getMiniHBaseCluster().getRegionServerThreads().get(index).getRegionServer();
      }
      // Came back -1.  Region may not be online yet.  Sleep a while.
      retrier.sleepUntilNextRetry();
    }
    return null;
  }

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  public void delete(String path, int version)
  throws InterruptedException, KeeperException {
    TraceScope traceScope = null;
    try {
      traceScope = Trace.startSpan("RecoverableZookeeper.delete");
      RetryCounter retryCounter = retryCounterFactory.create();
      boolean isRetry = false; // False for first attempt, true for all retries.
      while (true) {
        try {
          zk.delete(path, version);
          return;
        } catch (KeeperException e) {
          switch (e.code()) {
            case NONODE:
              if (isRetry) {
                LOG.info("Node " + path + " already deleted. Assuming a " +
                    "previous attempt succeeded.");
                return;
              }
              LOG.warn("Node " + path + " already deleted, retry=" + isRetry);
              throw e;


            case CONNECTIONLOSS:
            case SESSIONEXPIRED:
            case OPERATIONTIMEOUT:
              retryOrThrow(retryCounter, e, "delete");
              break;


            default:
              throw e;
          }
        }
        retryCounter.sleepUntilNextRetry();
        retryCounter.useRetry();
        isRetry = true;
      }
    } finally {
      if (traceScope != null) traceScope.close();
    }

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  public Stat exists(String path, Watcher watcher)
  throws KeeperException, InterruptedException {
    TraceScope traceScope = null;
    try {
      traceScope = Trace.startSpan("RecoverableZookeeper.exists");
      RetryCounter retryCounter = retryCounterFactory.create();
      while (true) {
        try {
          return zk.exists(path, watcher);
        } catch (KeeperException e) {
          switch (e.code()) {
            case CONNECTIONLOSS:
            case SESSIONEXPIRED:
            case OPERATIONTIMEOUT:
              retryOrThrow(retryCounter, e, "exists");
              break;


            default:
              throw e;
          }
        }
        retryCounter.sleepUntilNextRetry();
        retryCounter.useRetry();
      }
    } finally {
      if (traceScope != null) traceScope.close();
    }
  }

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  public Stat exists(String path, boolean watch)
  throws KeeperException, InterruptedException {
    TraceScope traceScope = null;
    try {
      traceScope = Trace.startSpan("RecoverableZookeeper.exists");
      RetryCounter retryCounter = retryCounterFactory.create();
      while (true) {
        try {
          return zk.exists(path, watch);
        } catch (KeeperException e) {
          switch (e.code()) {
            case CONNECTIONLOSS:
            case SESSIONEXPIRED:
            case OPERATIONTIMEOUT:
              retryOrThrow(retryCounter, e, "exists");
              break;


            default:
              throw e;
          }
        }
        retryCounter.sleepUntilNextRetry();
        retryCounter.useRetry();
      }
    } finally {
      if (traceScope != null) traceScope.close();
    }
  }

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  public List<String> getChildren(String path, Watcher watcher)
    throws KeeperException, InterruptedException {
    TraceScope traceScope = null;
    try {
      traceScope = Trace.startSpan("RecoverableZookeeper.getChildren");
      RetryCounter retryCounter = retryCounterFactory.create();
      while (true) {
        try {
          return zk.getChildren(path, watcher);
        } catch (KeeperException e) {
          switch (e.code()) {
            case CONNECTIONLOSS:
            case SESSIONEXPIRED:
            case OPERATIONTIMEOUT:
              retryOrThrow(retryCounter, e, "getChildren");
              break;


            default:
              throw e;
          }
        }
        retryCounter.sleepUntilNextRetry();
        retryCounter.useRetry();
      }
    } finally {
      if (traceScope != null) traceScope.close();
    }
  }

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  public List<String> getChildren(String path, boolean watch)
  throws KeeperException, InterruptedException {
    TraceScope traceScope = null;
    try {
      traceScope = Trace.startSpan("RecoverableZookeeper.getChildren");
      RetryCounter retryCounter = retryCounterFactory.create();
      while (true) {
        try {
          return zk.getChildren(path, watch);
        } catch (KeeperException e) {
          switch (e.code()) {
            case CONNECTIONLOSS:
            case SESSIONEXPIRED:
            case OPERATIONTIMEOUT:
              retryOrThrow(retryCounter, e, "getChildren");
              break;


            default:
              throw e;
          }
        }
        retryCounter.sleepUntilNextRetry();
        retryCounter.useRetry();
      }
    } finally {
      if (traceScope != null) traceScope.close();
    }
  }

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  public byte[] getData(String path, Watcher watcher, Stat stat)
  throws KeeperException, InterruptedException {
    TraceScope traceScope = null;
    try {
      traceScope = Trace.startSpan("RecoverableZookeeper.getData");
      RetryCounter retryCounter = retryCounterFactory.create();
      while (true) {
        try {
          byte[] revData = zk.getData(path, watcher, stat);
          return this.removeMetaData(revData);
        } catch (KeeperException e) {
          switch (e.code()) {
            case CONNECTIONLOSS:
            case SESSIONEXPIRED:
            case OPERATIONTIMEOUT:
              retryOrThrow(retryCounter, e, "getData");
              break;


            default:
              throw e;
          }
        }
        retryCounter.sleepUntilNextRetry();
        retryCounter.useRetry();
      }
    } finally {
      if (traceScope != null) traceScope.close();
    }
  }

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  public byte[] getData(String path, boolean watch, Stat stat)
  throws KeeperException, InterruptedException {
    TraceScope traceScope = null;
    try {
      traceScope = Trace.startSpan("RecoverableZookeeper.getData");
      RetryCounter retryCounter = retryCounterFactory.create();
      while (true) {
        try {
          byte[] revData = zk.getData(path, watch, stat);
          return this.removeMetaData(revData);
        } catch (KeeperException e) {
          switch (e.code()) {
            case CONNECTIONLOSS:
            case SESSIONEXPIRED:
            case OPERATIONTIMEOUT:
              retryOrThrow(retryCounter, e, "getData");
              break;


            default:
              throw e;
          }
        }
        retryCounter.sleepUntilNextRetry();
        retryCounter.useRetry();
      }
    } finally {
      if (traceScope != null) traceScope.close();
    }
  }

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