Examples with EndOfStreamException com.twitter.distributedlog.exceptions.EndOfStreamException used on opensource projects

Example 1 with EndOfStreamException

use of com.twitter.distributedlog.exceptions.EndOfStreamException in project distributedlog by twitter.

the class BKSyncLogReaderDLSN method readNext.

@Override
public synchronized LogRecordWithDLSN readNext(boolean nonBlocking) throws IOException {
    if (null != readerException.get()) {
        throw readerException.get();
    }
    LogRecordWithDLSN record = null;
    if (nonBlocking) {
        record = readAheadRecords.poll();
    } else {
        try {
            // reader is still catching up, waiting for next record
            while (!reader.bkLedgerManager.isReadAheadCaughtUp() && null == readerException.get() && null == record) {
                record = readAheadRecords.poll(maxReadAheadWaitTime, TimeUnit.MILLISECONDS);
            }
            // reader caught up
            boolean shallWait = true;
            while (shallWait && reader.bkLedgerManager.isReadAheadCaughtUp() && null == record && null == readerException.get()) {
                record = readAheadRecords.poll(maxReadAheadWaitTime, TimeUnit.MILLISECONDS);
                if (null != record) {
                    break;
                }
                DLSN lastDLSNSeenByReadAhead = reader.bkLedgerManager.readAheadCache.getLastReadAheadUserDLSN();
                // if last seen DLSN by reader is same as the one seen by ReadAhead
                // that means that reader is caught up with ReadAhead and ReadAhead
                // is caught up with stream
                shallWait = DLSN.InitialDLSN != lastDLSNSeenByReadAhead && lastSeenDLSN.compareTo(lastDLSNSeenByReadAhead) < 0 && startDLSN.compareTo(lastDLSNSeenByReadAhead) <= 0;
            }
        } catch (InterruptedException e) {
            throw new DLInterruptedException("Interrupted on waiting next available log record for stream " + reader.getStreamName(), e);
        }
    }
    if (null != readerException.get()) {
        throw readerException.get();
    }
    if (null != record) {
        if (record.isEndOfStream()) {
            EndOfStreamException eos = new EndOfStreamException("End of Stream Reached for " + reader.bkLedgerManager.getFullyQualifiedName());
            readerException.compareAndSet(null, eos);
            throw eos;
        }
        invokeReadAheadCallback();
    }
    return record;
}

Example 2 with EndOfStreamException

use of com.twitter.distributedlog.exceptions.EndOfStreamException in project distributedlog by twitter.

the class TestAsyncReaderWriter method testMarkEndOfStreamAtBeginningOfSegment.

@Test(timeout = 60000)
public void testMarkEndOfStreamAtBeginningOfSegment() throws Exception {
    String name = runtime.getMethodName();
    DistributedLogConfiguration confLocal = new DistributedLogConfiguration();
    confLocal.addConfiguration(testConf);
    confLocal.setOutputBufferSize(0);
    confLocal.setImmediateFlushEnabled(true);
    confLocal.setPeriodicFlushFrequencyMilliSeconds(0);
    DistributedLogManager dlm = createNewDLM(confLocal, name);
    BKAsyncLogWriter writer = (BKAsyncLogWriter) dlm.startAsyncLogSegmentNonPartitioned();
    Await.result(writer.markEndOfStream());
    try {
        Await.result(writer.write(DLMTestUtil.getLogRecordInstance(1)));
        fail("Should have thrown");
    } catch (EndOfStreamException ex) {
    }
    BKAsyncLogReaderDLSN reader = (BKAsyncLogReaderDLSN) dlm.getAsyncLogReader(DLSN.InitialDLSN);
    try {
        LogRecord record = Await.result(reader.readNext());
        fail("Should have thrown");
    } catch (EndOfStreamException ex) {
    }
}

Example 3 with EndOfStreamException

use of com.twitter.distributedlog.exceptions.EndOfStreamException in project distributedlog by twitter.

the class TestBKLogSegmentWriter method testNondurableWriteAfterEndOfStream.

/**
     * Non durable write should fail if writer is marked as end of stream.
     *
     * @throws Exception
     */
@Test(timeout = 60000)
public void testNondurableWriteAfterEndOfStream() throws Exception {
    DistributedLogConfiguration confLocal = newLocalConf();
    confLocal.setImmediateFlushEnabled(false);
    confLocal.setOutputBufferSize(Integer.MAX_VALUE);
    confLocal.setPeriodicFlushFrequencyMilliSeconds(0);
    confLocal.setDurableWriteEnabled(false);
    ZKDistributedLock lock = createLock("/test/lock-" + runtime.getMethodName(), zkc, true);
    BKLogSegmentWriter writer = createLogSegmentWriter(confLocal, 0L, -1L, lock);
    FutureUtils.result(writer.markEndOfStream());
    try {
        Await.result(writer.asyncWrite(DLMTestUtil.getLogRecordInstance(1)));
        fail("Should fail the write if the writer is marked as end of stream");
    } catch (EndOfStreamException we) {
    // expected
    }
    closeWriterAndLock(writer, lock);
}

Example 4 with EndOfStreamException

use of com.twitter.distributedlog.exceptions.EndOfStreamException in project distributedlog by twitter.

the class BKAsyncLogReaderDLSN method run.

@Override
public void run() {
    synchronized (scheduleLock) {
        if (scheduleDelayStopwatch.isRunning()) {
            scheduleLatency.registerSuccessfulEvent(scheduleDelayStopwatch.stop().elapsed(TimeUnit.MICROSECONDS));
        }
        Stopwatch runTime = Stopwatch.createStarted();
        int iterations = 0;
        long scheduleCountLocal = scheduleCount.get();
        LOG.debug("{}: Scheduled Background Reader", bkLedgerManager.getFullyQualifiedName());
        while (true) {
            if (LOG.isTraceEnabled()) {
                LOG.trace("{}: Executing Iteration: {}", bkLedgerManager.getFullyQualifiedName(), iterations++);
            }
            PendingReadRequest nextRequest = null;
            synchronized (this) {
                nextRequest = pendingRequests.peek();
                // Queue is empty, nothing to read, return
                if (null == nextRequest) {
                    LOG.trace("{}: Queue Empty waiting for Input", bkLedgerManager.getFullyQualifiedName());
                    scheduleCount.set(0);
                    backgroundReaderRunTime.registerSuccessfulEvent(runTime.stop().elapsed(TimeUnit.MICROSECONDS));
                    return;
                }
                if (disableProcessingReadRequests) {
                    LOG.info("Reader of {} is forced to stop processing read requests", bkLedgerManager.getFullyQualifiedName());
                    return;
                }
            }
            // know the last consumed read
            if (null == lastException.get()) {
                if (nextRequest.getPromise().isInterrupted().isDefined()) {
                    setLastException(new DLInterruptedException("Interrupted on reading " + bkLedgerManager.getFullyQualifiedName() + " : ", nextRequest.getPromise().isInterrupted().get()));
                }
            }
            if (checkClosedOrInError("readNext")) {
                if (!(lastException.get().getCause() instanceof LogNotFoundException)) {
                    LOG.warn("{}: Exception", bkLedgerManager.getFullyQualifiedName(), lastException.get());
                }
                backgroundReaderRunTime.registerFailedEvent(runTime.stop().elapsed(TimeUnit.MICROSECONDS));
                return;
            }
            try {
                // Fail 10% of the requests when asked to simulate errors
                if (failureInjector.shouldInjectErrors()) {
                    throw new IOException("Reader Simulated Exception");
                }
                LogRecordWithDLSN record;
                while (!nextRequest.hasReadEnoughRecords()) {
                    // read single record
                    do {
                        record = bkLedgerManager.getNextReadAheadRecord();
                    } while (null != record && (record.isControl() || (record.getDlsn().compareTo(getStartDLSN()) < 0)));
                    if (null == record) {
                        break;
                    } else {
                        if (record.isEndOfStream() && !returnEndOfStreamRecord) {
                            setLastException(new EndOfStreamException("End of Stream Reached for " + bkLedgerManager.getFullyQualifiedName()));
                            break;
                        }
                        // gap detection
                        if (recordPositionsContainsGap(record, lastPosition)) {
                            bkDistributedLogManager.raiseAlert("Gap detected between records at dlsn = {}", record.getDlsn());
                            if (positionGapDetectionEnabled) {
                                throw new DLIllegalStateException("Gap detected between records at dlsn = " + record.getDlsn());
                            }
                        }
                        lastPosition = record.getLastPositionWithinLogSegment();
                        nextRequest.addRecord(record);
                    }
                }
                ;
            } catch (IOException exc) {
                setLastException(exc);
                if (!(exc instanceof LogNotFoundException)) {
                    LOG.warn("{} : read with skip Exception", bkLedgerManager.getFullyQualifiedName(), lastException.get());
                }
                continue;
            }
            if (nextRequest.hasReadRecords()) {
                long remainingWaitTime = nextRequest.getRemainingWaitTime();
                if (remainingWaitTime > 0 && !nextRequest.hasReadEnoughRecords()) {
                    backgroundReaderRunTime.registerSuccessfulEvent(runTime.stop().elapsed(TimeUnit.MICROSECONDS));
                    scheduleDelayStopwatch.reset().start();
                    scheduleCount.set(0);
                    // the request could still wait for more records
                    backgroundScheduleTask = executorService.schedule(BACKGROUND_READ_SCHEDULER, remainingWaitTime, nextRequest.deadlineTimeUnit);
                    return;
                }
                PendingReadRequest request = pendingRequests.poll();
                if (null != request && nextRequest == request) {
                    request.complete();
                    if (null != backgroundScheduleTask) {
                        backgroundScheduleTask.cancel(true);
                        backgroundScheduleTask = null;
                    }
                } else {
                    DLIllegalStateException ise = new DLIllegalStateException("Unexpected condition at dlsn = " + nextRequest.records.get(0).getDlsn());
                    nextRequest.setException(ise);
                    if (null != request) {
                        request.setException(ise);
                    }
                    // We should never get here as we should have exited the loop if
                    // pendingRequests were empty
                    bkDistributedLogManager.raiseAlert("Unexpected condition at dlsn = {}", nextRequest.records.get(0).getDlsn());
                    setLastException(ise);
                }
            } else {
                if (0 == scheduleCountLocal) {
                    LOG.trace("Schedule count dropping to zero", lastException.get());
                    backgroundReaderRunTime.registerSuccessfulEvent(runTime.stop().elapsed(TimeUnit.MICROSECONDS));
                    return;
                }
                scheduleCountLocal = scheduleCount.decrementAndGet();
            }
        }
    }
}

Example 5 with EndOfStreamException

use of com.twitter.distributedlog.exceptions.EndOfStreamException in project distributedlog by twitter.

the class TestAsyncReaderWriter method testMarkEndOfStream.

@Test(timeout = 60000)
public void testMarkEndOfStream() throws Exception {
    String name = runtime.getMethodName();
    DistributedLogConfiguration confLocal = new DistributedLogConfiguration();
    confLocal.addConfiguration(testConf);
    confLocal.setOutputBufferSize(0);
    confLocal.setImmediateFlushEnabled(true);
    confLocal.setPeriodicFlushFrequencyMilliSeconds(0);
    DistributedLogManager dlm = createNewDLM(confLocal, name);
    BKAsyncLogWriter writer = (BKAsyncLogWriter) dlm.startAsyncLogSegmentNonPartitioned();
    final int NUM_RECORDS = 10;
    int i = 1;
    for (; i <= NUM_RECORDS; i++) {
        Await.result(writer.write(DLMTestUtil.getLogRecordInstance(i)));
        assertEquals("last tx id should become " + i, i, writer.getLastTxId());
    }
    Await.result(writer.markEndOfStream());
    // Multiple end of streams are ok.
    Await.result(writer.markEndOfStream());
    try {
        Await.result(writer.write(DLMTestUtil.getLogRecordInstance(i)));
        fail("Should have thrown");
    } catch (EndOfStreamException ex) {
    }
    BKAsyncLogReaderDLSN reader = (BKAsyncLogReaderDLSN) dlm.getAsyncLogReader(DLSN.InitialDLSN);
    LogRecord record = null;
    for (int j = 0; j < NUM_RECORDS; j++) {
        record = Await.result(reader.readNext());
        assertEquals(j + 1, record.getTransactionId());
    }
    try {
        record = Await.result(reader.readNext());
        fail("Should have thrown");
    } catch (EndOfStreamException ex) {
    }
}