Examples with BootstrapCheckpointHandler com.linkedin.databus.core.BootstrapCheckpointHandler used on opensource projects

Example 6 with BootstrapCheckpointHandler

use of com.linkedin.databus.core.BootstrapCheckpointHandler in project databus by linkedin.

the class TestGenericDispatcher method testBootstrapPartialWindowScnOrdering.

@Test
public void testBootstrapPartialWindowScnOrdering() throws Exception {
    final Logger log = Logger.getLogger("TestGenericDispatcher.testBootstrapPartialWindowScnOrdering");
    //log.setLevel(Level.DEBUG);
    log.info("start");
    //DDSDBUS-1889: Ensure bootstrap onCheckpoint() callback receives bootstrapSinceScn - not some scn.
    int numEvents = 100;
    int maxWindowSize = 25;
    /* Experiment setup */
    int payloadSize = 20;
    int numCheckpoints = numEvents / maxWindowSize;
    /* Consumer creation */
    //setup consumer to fail on end of first full window
    int timeTakenForDataEventInMs = 1;
    int timeTakenForControlEventInMs = 1;
    int numFailCheckpointEvent = 0;
    int numFailDataEvent = 0;
    int numFailEndWindow = 1;
    int numFailures = 1;
    //fail at the specified window; no retries; so the dispatcher should stop having written one window; but having checkpointed the other
    //thanks to a very small checkpoint frequency threshold
    TimeoutTestConsumer tConsumer = new TimeoutTestConsumer(timeTakenForDataEventInMs, timeTakenForControlEventInMs, numFailCheckpointEvent, numFailDataEvent, numFailEndWindow, numFailures);
    HashMap<Long, List<RegisterResponseEntry>> schemaMap = new HashMap<Long, List<RegisterResponseEntry>>();
    short srcId = 1;
    List<RegisterResponseEntry> l1 = new ArrayList<RegisterResponseEntry>();
    l1.add(new RegisterResponseEntry(1L, srcId, SOURCE1_SCHEMA_STR));
    schemaMap.put(1L, l1);
    Map<Long, IdNamePair> sourcesMap = new HashMap<Long, IdNamePair>();
    List<String> sources = new ArrayList<String>();
    for (int i = 1; i <= 1; ++i) {
        IdNamePair sourcePair = new IdNamePair((long) i, "source" + i);
        sources.add(sourcePair.getName());
        sourcesMap.put(sourcePair.getId(), sourcePair);
    }
    long consumerTimeBudgetMs = 60 * 1000;
    DatabusV2ConsumerRegistration consumerReg = new DatabusV2ConsumerRegistration(tConsumer, sources, null);
    List<DatabusV2ConsumerRegistration> allRegistrations = Arrays.asList(consumerReg);
    //Single threaded execution of consumer
    MultiConsumerCallback mConsumer = new MultiConsumerCallback(allRegistrations, Executors.newFixedThreadPool(1), consumerTimeBudgetMs, new StreamConsumerCallbackFactory(null, null), null, null, null, null);
    /* Generate events **/
    Vector<DbusEvent> srcTestEvents = new Vector<DbusEvent>();
    Vector<Short> srcIdList = new Vector<Short>();
    srcIdList.add(srcId);
    DbusEventGenerator evGen = new DbusEventGenerator(15000, srcIdList);
    Assert.assertTrue(evGen.generateEvents(numEvents, maxWindowSize, 512, payloadSize, true, srcTestEvents) > 0);
    int totalSize = 0;
    int maxSize = 0;
    for (DbusEvent e : srcTestEvents) {
        totalSize += e.size();
        maxSize = (e.size() > maxSize) ? e.size() : maxSize;
    }
    /* Source configuration */
    double thresholdChkptPct = 5.0;
    DatabusSourcesConnection.Config conf = new DatabusSourcesConnection.Config();
    conf.setCheckpointThresholdPct(thresholdChkptPct);
    conf.getDispatcherRetries().setMaxRetryNum(0);
    conf.setFreeBufferThreshold(maxSize);
    conf.setConsumerTimeBudgetMs(consumerTimeBudgetMs);
    int freeBufferThreshold = conf.getFreeBufferThreshold();
    DatabusSourcesConnection.StaticConfig connConfig = conf.build();
    //make buffer large enough to hold data; the control events are large that contain checkpoints
    int producerBufferSize = totalSize * 2 + numCheckpoints * 10 * maxSize * 5 + freeBufferThreshold;
    int individualBufferSize = producerBufferSize;
    int indexSize = producerBufferSize / 10;
    int stagingBufferSize = producerBufferSize;
    /*Event Buffer creation */
    TestGenericDispatcherEventBuffer dataEventsBuffer = new TestGenericDispatcherEventBuffer(getConfig(producerBufferSize, individualBufferSize, indexSize, stagingBufferSize, AllocationPolicy.HEAP_MEMORY, QueuePolicy.BLOCK_ON_WRITE));
    List<DatabusSubscription> subs = DatabusSubscription.createSubscriptionList(sources);
    /* Generic Dispatcher creation */
    InMemoryPersistenceProvider cpPersister = new InMemoryPersistenceProvider();
    BootstrapDispatcher dispatcher = new BootstrapDispatcher("bootstrapPartialWindowCheckpointPersistence", connConfig, subs, cpPersister, dataEventsBuffer, mConsumer, //relaypuller
    null, //mbean server
    null, //ClientImpl
    null, //registrationId
    null, // logger
    null);
    dispatcher.setSchemaIdCheck(false);
    BootstrapCheckpointHandler cptHandler = new BootstrapCheckpointHandler("source1");
    long sinceScn = 15000L;
    long startTsNsecs = System.nanoTime();
    final Checkpoint initCheckpoint = cptHandler.createInitialBootstrapCheckpoint(null, sinceScn);
    initCheckpoint.setBootstrapStartNsecs(startTsNsecs);
    initCheckpoint.setBootstrapStartScn(0L);
    /* Launch writer */
    //numBootstrapCheckpoint - number of checkpoints before writing end of period
    int numBootstrapCheckpoint = 4;
    DbusEventAppender eventProducer = new DbusEventAppender(srcTestEvents, dataEventsBuffer, numBootstrapCheckpoint, null);
    //simulate bootstrap server; use this checkpoint as init checkpoint
    eventProducer.setBootstrapCheckpoint(initCheckpoint);
    Thread tEmitter = new Thread(eventProducer);
    //be generous ; use worst case for num control events
    long waitTimeMs = (numEvents * timeTakenForDataEventInMs + numEvents * timeTakenForControlEventInMs) * 4;
    tEmitter.start();
    tEmitter.join(waitTimeMs);
    /* Launch dispatcher */
    Thread tDispatcher = new Thread(dispatcher);
    tDispatcher.start();
    /* Now initialize this  state machine */
    dispatcher.enqueueMessage(SourcesMessage.createSetSourcesIdsMessage(sourcesMap.values()));
    dispatcher.enqueueMessage(SourcesMessage.createSetSourcesSchemasMessage(schemaMap));
    //expect dispatcher to fail - at end of window
    tDispatcher.join(waitTimeMs);
    Assert.assertFalse(tEmitter.isAlive());
    Assert.assertFalse(tDispatcher.isAlive());
    LOG.info("tConsumer: " + tConsumer);
    HashMap<List<String>, Checkpoint> cps = cpPersister.getCheckpoints();
    Assert.assertTrue(cps.size() > 0);
    for (Map.Entry<List<String>, Checkpoint> i : cps.entrySet()) {
        Checkpoint cp = i.getValue();
        LOG.info("checkpoint=" + cp);
        Assert.assertEquals(cp.getConsumptionMode(), DbusClientMode.BOOTSTRAP_SNAPSHOT);
        //check if progress has been made during bootstrap
        Assert.assertTrue(cp.getSnapshotOffset() > 0);
        //these two values should be unchanged during the course of bootstrap
        Assert.assertEquals(sinceScn, cp.getBootstrapSinceScn().longValue());
        Assert.assertEquals(startTsNsecs, cp.getBootstrapStartNsecs());
        //the tsNsec normally udpdated by client at end of window should be a no-op during bootstrap
        Assert.assertEquals(Checkpoint.UNSET_TS_NSECS, cp.getTsNsecs());
        //the scn passed to consumers during onCheckpoint should be the sinceSCN and not any other interim value
        Assert.assertEquals(cp.getBootstrapSinceScn().longValue(), tConsumer.getLastSeenCheckpointScn());
    }
    log.info("end\n");
}