Examples of com.cloudera.util.CappedExponentialBackoff

com.cloudera.util.CappedExponentialBackoff
This provides a simple reusable exponential backoff state object. Note that this only does calculations and tracks the backoff state but doesn't actually do backoffs (e.g. do blocking sleeps)! Later this could be pluggable with other backoff policies (maybe adaptive?) This policy has a max backoff per attempt but *never* fails!

              new CumulativeCappedExponentialBackoff(initMs, maxMs,
                  cumulativeMaxMs));
        }


        return new InsistentOpenDecorator<EventSink>(null,
            new CappedExponentialBackoff(initMs, maxMs));
      }


    };
  }

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        FlumeConfiguration.get().getFailoverMaxSingleBackoff());
  }


  public BackOffFailOverSink(EventSink primary, EventSink backup,
      long initialBackoff, long maxBackoff) {
    this(primary, backup, new CappedExponentialBackoff(initialBackoff,
        maxBackoff));
  }

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   * 'initial' ms, exponentially backs off an individual sleep upto 'sleepCap'
   * ms. This has no cumulative cap and will never give up.
   */
  public InsistentAppendDecorator(S s, long initial, long sleepCap) {
    super(s);
    this.backoff = new CappedExponentialBackoff(initial, sleepCap);
  }

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   * 'initial' ms, exponentially backs off an individual sleep upto 'sleepCap'
   * ms. This has no cumulative cap and will never give up.
   */
  public InsistentOpenDecorator(S s, long sleepCap, long initial) {
    super(s);
    this.backoff = new CappedExponentialBackoff(initial, sleepCap);
    this.openSuccesses = 0;
    this.openRetries = 0;
  }

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              new CumulativeCappedExponentialBackoff(initMs, maxMs,
                  cumulativeMaxMs));
        }


        return new InsistentOpenDecorator<EventSink>(null,
            new CappedExponentialBackoff(initMs, maxMs));
      }


    };
  }

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    // WARNING! This test relies on being able to sleep for ~10ms and be woken
    // up three times in a 5s period. Seems plausible! But if you are looking at
    // this comment, it's probably because the test is failing on a loaded
    // machine...
    BackoffPolicy bop = new CappedExponentialBackoff(10, 5000);
    InsistentOpenDecorator<EventSink> sink = new InsistentOpenDecorator<EventSink>(
        fail2x, bop);
    sink.open();
    sink.append(new EventImpl("test".getBytes()));
    sink.close();

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    doReturn(new ReportEvent("stub")).when(fail4eva).getMetrics();


    final CountDownLatch done = new CountDownLatch(1);


    // max 5s, backoff initially at 10ms
    BackoffPolicy bop = new CappedExponentialBackoff(10, 5000);
    final InsistentOpenDecorator<EventSink> sink = new InsistentOpenDecorator<EventSink>(
        fail4eva, bop);


    Thread t = new Thread() {
      @Override

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   * @throws IOException
   * @throws InterruptedException
   */
  @Test
  public void testOpenInterruption() throws IOException, InterruptedException {
    BackoffPolicy bop = new CappedExponentialBackoff(10, 5000);
    EventSink snk = new InsistentOpenDecorator<EventSink>(
        InterruptSinks.openSink(), bop);
    try {
      snk.open();
    } catch (InterruptedException ie) {

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    EventSink fail4eva = mock(EventSink.Base.class);
    doThrow(new IOException("mock exception")).when(fail4eva).open();
    doReturn(new ReportEvent("stub")).when(fail4eva).getMetrics();


    // max 5s, backoff initially at 10ms
    BackoffPolicy bop = new CappedExponentialBackoff(10, 5000);
    final InsistentOpenDecorator<EventSink> insistent = new InsistentOpenDecorator<EventSink>(
        fail4eva, bop);
    final EventSink sink = new LazyOpenDecorator<EventSink>(insistent);


    // create an endless stream of data

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    doThrow(new IOException("mock exception")).when(fail4eva).append(e);
    doReturn(new ReportEvent("mock report")).when(fail4eva).getMetrics();
    doReturn("mock name").when(fail4eva).getName();


    // max 5s, backoff initially at 10ms
    BackoffPolicy bop = new CappedExponentialBackoff(10, 5000);
    final EventSink insistent = new InsistentAppendDecorator<EventSink>(
        fail4eva, bop);
    final EventSink sink = new LazyOpenDecorator<EventSink>(insistent);


    // create an endless stream of data

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Related Classes of com.cloudera.util.CappedExponentialBackoff

com.cloudera.flume.core.BackOffFailOverSink

com.cloudera.flume.core.connector.TestDirectDriver

com.cloudera.flume.handlers.debug.InsistentAppendDecorator

com.cloudera.flume.handlers.debug.InsistentOpenDecorator

com.cloudera.flume.handlers.debug.TestInsistentOpen

com.cloudera.flume.master.availability.FailoverChainSink

com.cloudera.flume.reporter.ReportEvent

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