Examples with AsyncLogReader com.twitter.distributedlog.AsyncLogReader used on opensource projects

Example 1 with AsyncLogReader

use of com.twitter.distributedlog.AsyncLogReader in project distributedlog by twitter.

the class AsyncReaderBenchmark method benchmark.

@Override
protected void benchmark(DistributedLogNamespace namespace, String logName, StatsLogger statsLogger) {
    DistributedLogManager dlm = null;
    while (null == dlm) {
        try {
            dlm = namespace.openLog(streamName);
        } catch (IOException ioe) {
            logger.warn("Failed to create dlm for stream {} : ", streamName, ioe);
        }
        if (null == dlm) {
            try {
                TimeUnit.MILLISECONDS.sleep(conf.getZKSessionTimeoutMilliseconds());
            } catch (InterruptedException e) {
            }
        }
    }
    logger.info("Created dlm for stream {}.", streamName);
    // Stats
    OpStatsLogger openReaderStats = statsLogger.getOpStatsLogger("open_reader");
    OpStatsLogger blockingReadStats = statsLogger.getOpStatsLogger("blocking_read");
    Counter readCounter = statsLogger.getCounter("reads");
    AsyncLogReader reader = null;
    DLSN lastDLSN = null;
    Long lastTxId = null;
    while (null == reader) {
        // initialize the last txid
        if (null == lastTxId) {
            switch(readMode) {
                case OLDEST:
                    lastTxId = 0L;
                    lastDLSN = DLSN.InitialDLSN;
                    break;
                case LATEST:
                    lastTxId = Long.MAX_VALUE;
                    try {
                        lastDLSN = dlm.getLastDLSN();
                    } catch (IOException ioe) {
                        continue;
                    }
                    break;
                case REWIND:
                    lastTxId = System.currentTimeMillis() - rewindMs;
                    lastDLSN = null;
                    break;
                case POSITION:
                    lastTxId = fromTxId;
                    lastDLSN = null;
                    break;
                default:
                    logger.warn("Unsupported mode {}", readMode);
                    printUsage();
                    System.exit(0);
                    break;
            }
            logger.info("Reading from transaction id = {}, dlsn = {}", lastTxId, lastDLSN);
        }
        // Open the reader
        Stopwatch stopwatch = Stopwatch.createStarted();
        try {
            if (null == lastDLSN) {
                reader = FutureUtils.result(dlm.openAsyncLogReader(lastTxId));
            } else {
                reader = FutureUtils.result(dlm.openAsyncLogReader(lastDLSN));
            }
            long elapsedMs = stopwatch.elapsed(TimeUnit.MICROSECONDS);
            openReaderStats.registerSuccessfulEvent(elapsedMs);
            logger.info("It took {} ms to position the reader to transaction id = {}, dlsn = {}", lastTxId, lastDLSN);
        } catch (IOException ioe) {
            openReaderStats.registerFailedEvent(stopwatch.elapsed(TimeUnit.MICROSECONDS));
            logger.warn("Failed to create reader for stream {} reading from tx id = {}, dlsn = {}.", new Object[] { streamName, lastTxId, lastDLSN });
        }
        if (null == reader) {
            try {
                TimeUnit.MILLISECONDS.sleep(conf.getZKSessionTimeoutMilliseconds());
            } catch (InterruptedException e) {
            }
            continue;
        }
        List<LogRecordWithDLSN> records;
        stopwatch = Stopwatch.createUnstarted();
        while (true) {
            try {
                stopwatch.start();
                records = FutureUtils.result(reader.readBulk(batchSize));
                long elapsedMicros = stopwatch.stop().elapsed(TimeUnit.MICROSECONDS);
                blockingReadStats.registerSuccessfulEvent(elapsedMicros);
                if (!records.isEmpty()) {
                    readCounter.add(records.size());
                    LogRecordWithDLSN lastRecord = records.get(records.size() - 1);
                    lastTxId = lastRecord.getTransactionId();
                    lastDLSN = lastRecord.getDlsn();
                }
                stopwatch.reset();
            } catch (IOException e) {
                logger.warn("Encountered reading record from stream {} : ", streamName, e);
                reader = null;
                break;
            }
        }
        try {
            TimeUnit.MILLISECONDS.sleep(conf.getZKSessionTimeoutMilliseconds());
        } catch (InterruptedException e) {
        }
    }
}

Example 2 with AsyncLogReader

use of com.twitter.distributedlog.AsyncLogReader in project distributedlog by twitter.

the class TestDistributedLogServer method testDeleteStream.

@Test(timeout = 60000)
public void testDeleteStream() throws Exception {
    String name = "dlserver-delete-stream";
    dlClient.routingService.addHost(name, dlServer.getAddress());
    long txid = 101;
    for (long i = 1; i <= 10; i++) {
        long curTxId = txid++;
        logger.debug("Write entry {} to stream {}.", curTxId, name);
        dlClient.dlClient.write(name, ByteBuffer.wrap(("" + curTxId).getBytes())).get();
    }
    checkStream(1, 1, 1, name, dlServer.getAddress(), true, true);
    dlClient.dlClient.delete(name).get();
    checkStream(0, 0, 0, name, dlServer.getAddress(), false, false);
    Thread.sleep(1000);
    DistributedLogManager dlm101 = DLMTestUtil.createNewDLM(name, conf, getUri());
    AsyncLogReader reader101 = FutureUtils.result(dlm101.openAsyncLogReader(DLSN.InitialDLSN));
    try {
        FutureUtils.result(reader101.readNext());
        fail("Should fail with LogNotFoundException since the stream is deleted");
    } catch (LogNotFoundException lnfe) {
    // expected
    }
    FutureUtils.result(reader101.asyncClose());
    dlm101.close();
    txid = 201;
    for (long i = 1; i <= 10; i++) {
        long curTxId = txid++;
        logger.debug("Write entry {} to stream {}.", curTxId, name);
        DLSN dlsn = dlClient.dlClient.write(name, ByteBuffer.wrap(("" + curTxId).getBytes())).get();
    }
    Thread.sleep(1000);
    DistributedLogManager dlm201 = DLMTestUtil.createNewDLM(name, conf, getUri());
    LogReader reader201 = dlm201.getInputStream(1);
    int numRead = 0;
    int curTxId = 201;
    LogRecord r = reader201.readNext(false);
    while (null != r) {
        int i = Integer.parseInt(new String(r.getPayload()));
        assertEquals(curTxId++, i);
        ++numRead;
        r = reader201.readNext(false);
    }
    assertEquals(10, numRead);
    reader201.close();
    dlm201.close();
}

Example 3 with AsyncLogReader

use of com.twitter.distributedlog.AsyncLogReader in project distributedlog by twitter.

the class TestDistributedLogAdmin method testChangeSequenceNumber.

/**
     * {@link https://issues.apache.org/jira/browse/DL-44}
     */
@DistributedLogAnnotations.FlakyTest
@Ignore
@Test(timeout = 60000)
@SuppressWarnings("deprecation")
public void testChangeSequenceNumber() throws Exception {
    DistributedLogConfiguration confLocal = new DistributedLogConfiguration();
    confLocal.addConfiguration(conf);
    confLocal.setLogSegmentSequenceNumberValidationEnabled(false);
    URI uri = createDLMURI("/change-sequence-number");
    zooKeeperClient.get().create(uri.getPath(), new byte[0], ZooDefs.Ids.OPEN_ACL_UNSAFE, CreateMode.PERSISTENT);
    com.twitter.distributedlog.DistributedLogManagerFactory factory = new com.twitter.distributedlog.DistributedLogManagerFactory(confLocal, uri);
    String streamName = "change-sequence-number";
    // create completed log segments
    DistributedLogManager dlm = factory.createDistributedLogManagerWithSharedClients(streamName);
    DLMTestUtil.generateCompletedLogSegments(dlm, confLocal, 4, 10);
    DLMTestUtil.injectLogSegmentWithGivenLogSegmentSeqNo(dlm, confLocal, 5, 41, false, 10, true);
    dlm.close();
    // create a reader
    DistributedLogManager readDLM = factory.createDistributedLogManagerWithSharedClients(streamName);
    AsyncLogReader reader = readDLM.getAsyncLogReader(DLSN.InitialDLSN);
    // read the records
    long expectedTxId = 1L;
    for (int i = 0; i < 4 * 10; i++) {
        LogRecord record = Await.result(reader.readNext());
        assertNotNull(record);
        DLMTestUtil.verifyLogRecord(record);
        assertEquals(expectedTxId, record.getTransactionId());
        expectedTxId++;
    }
    dlm = factory.createDistributedLogManagerWithSharedClients(streamName);
    DLMTestUtil.injectLogSegmentWithGivenLogSegmentSeqNo(dlm, confLocal, 3L, 5 * 10 + 1, true, 10, false);
    // Wait for reader to be aware of new log segments
    TimeUnit.SECONDS.sleep(2);
    DLSN dlsn = readDLM.getLastDLSN();
    assertTrue(dlsn.compareTo(new DLSN(5, Long.MIN_VALUE, Long.MIN_VALUE)) < 0);
    assertTrue(dlsn.compareTo(new DLSN(4, -1, Long.MIN_VALUE)) > 0);
    // there isn't records should be read
    Future<LogRecordWithDLSN> readFuture = reader.readNext();
    try {
        Await.result(readFuture, Duration.fromMilliseconds(1000));
        fail("Should fail reading next when there is a corrupted log segment");
    } catch (TimeoutException te) {
    // expected
    }
    // Dryrun
    DistributedLogAdmin.fixInprogressSegmentWithLowerSequenceNumber(factory, new DryrunLogSegmentMetadataStoreUpdater(confLocal, getLogSegmentMetadataStore(factory)), streamName, false, false);
    // Wait for reader to be aware of new log segments
    TimeUnit.SECONDS.sleep(2);
    dlsn = readDLM.getLastDLSN();
    assertTrue(dlsn.compareTo(new DLSN(5, Long.MIN_VALUE, Long.MIN_VALUE)) < 0);
    assertTrue(dlsn.compareTo(new DLSN(4, -1, Long.MIN_VALUE)) > 0);
    // there isn't records should be read
    try {
        Await.result(readFuture, Duration.fromMilliseconds(1000));
        fail("Should fail reading next when there is a corrupted log segment");
    } catch (TimeoutException te) {
    // expected
    }
    // Actual run
    DistributedLogAdmin.fixInprogressSegmentWithLowerSequenceNumber(factory, LogSegmentMetadataStoreUpdater.createMetadataUpdater(confLocal, getLogSegmentMetadataStore(factory)), streamName, false, false);
    // Wait for reader to be aware of new log segments
    TimeUnit.SECONDS.sleep(2);
    expectedTxId = 51L;
    LogRecord record = Await.result(readFuture);
    assertNotNull(record);
    DLMTestUtil.verifyLogRecord(record);
    assertEquals(expectedTxId, record.getTransactionId());
    expectedTxId++;
    for (int i = 1; i < 10; i++) {
        record = Await.result(reader.readNext());
        assertNotNull(record);
        DLMTestUtil.verifyLogRecord(record);
        assertEquals(expectedTxId, record.getTransactionId());
        expectedTxId++;
    }
    dlsn = readDLM.getLastDLSN();
    LOG.info("LastDLSN after fix inprogress segment : {}", dlsn);
    assertTrue(dlsn.compareTo(new DLSN(7, Long.MIN_VALUE, Long.MIN_VALUE)) < 0);
    assertTrue(dlsn.compareTo(new DLSN(6, -1, Long.MIN_VALUE)) > 0);
    Utils.close(reader);
    readDLM.close();
    dlm.close();
    factory.close();
}

Example 4 with AsyncLogReader

use of com.twitter.distributedlog.AsyncLogReader in project distributedlog by twitter.

the class ReaderWorker method close.

@Override
public void close() throws IOException {
    this.running = false;
    for (AsyncLogReader reader : logReaders) {
        if (null != reader) {
            FutureUtils.result(reader.asyncClose());
        }
    }
    for (DistributedLogManager dlm : dlms) {
        if (null != dlm) {
            dlm.close();
        }
    }
    namespace.close();
    SchedulerUtils.shutdownScheduler(executorService, 2, TimeUnit.MINUTES);
    SchedulerUtils.shutdownScheduler(callbackExecutor, 2, TimeUnit.MINUTES);
    if (this.dlc != null) {
        this.dlc.close();
    }
    for (DLZkServerSet serverSet : serverSets) {
        serverSet.close();
    }
}