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

Example 71 with Checkpoint

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

the class RelayPullThread method doStreamResponseDone.

protected void doStreamResponseDone(ConnectionState curState) {
    Checkpoint cp = curState.getCheckpoint();
    if (_log.isDebugEnabled()) {
        _log.debug("Data events done");
        _log.debug("Checkpoint at EventsDone: " + cp.toString());
    }
    if (curState.isFlexibleCheckpointRequest() && (curState.getDataEventsBuffer().getSeenEndOfPeriodScn() > 0))
        curState.setFlexibleCheckpointRequest(false);
    if (null != _sourcesConn.getLocalRelayCallsStatsCollector()) {
        long streamDuration = System.currentTimeMillis() - _streamCallStartMs;
        _sourcesConn.getLocalRelayCallsStatsCollector().registerStreamResponse(streamDuration);
        mergeRelayCallsStats();
    }
    _status.getRetriesCounter().sleep();
    curState.switchToRequestStream(cp);
    enqueueMessage(curState);
}

Example 72 with Checkpoint

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

the class GenericDispatcher method doRollback.

protected void doRollback(DispatcherState curState, SCN rollbackScn, boolean checkRetries, boolean regressItr) {
    boolean success = true;
    boolean debugEnabled = _log.isDebugEnabled();
    if (!curState.getStateId().equals(StateId.ROLLBACK)) {
        success = false;
        _log.error("ROLLBACK state is expected by the dispatcher, but the current state is:" + curState.getStateId());
    }
    int retriesLeft = Integer.MAX_VALUE;
    if (checkRetries) {
        retriesLeft = getStatus().getRetriesLeft();
        _log.info("Rolling back the dispatcher to last successful checkpoint. Number of remaining retries for dispatcher to replay events = " + retriesLeft);
        success = success && (retriesLeft > 0);
        if (success) {
            if (0 == getStatus().getRetriesNum())
                getStatus().retryOnError("rollback");
            else
                getStatus().retryOnLastError();
        }
    }
    if (success) {
        Checkpoint lastCp = curState.getLastSuccessfulCheckpoint();
        if ((null != lastCp) || (!regressItr)) {
            ConsumerCallbackResult callbackResult = ConsumerCallbackResult.ERROR;
            try {
                _log.info("Rolling back to SCN : " + rollbackScn);
                callbackResult = getAsyncCallback().onRollback(rollbackScn);
            } catch (RuntimeException e) {
                _log.error("Internal onRollback error: " + e.getMessage(), e);
            }
            success = ConsumerCallbackResult.isSuccess(callbackResult);
            if (success) {
                if (debugEnabled)
                    _log.debug("Rollback consumer callback succeeded");
            } else {
                _log.error("Rollback consumer callback failed");
            }
        }
        if (regressItr) {
            if (null != curState.getLastSuccessfulIterator()) {
                _log.info("Rolled back to last successful checkpoint position in the buffer: " + curState.getLastSuccessfulIterator());
                _currentWindowSizeInBytes = 0;
                curState.switchToReplayDataEvents();
            } else {
                _log.fatal("Unable to rollback, this usually means that the events belonging to the last checkpoint" + " are no longer to be found in the buffer. Please checkpoint more frequently to avoid this. Restarting the client " + "will fix this problem, last checkpoint found: \n" + lastCp);
                curState.switchToClosed();
            }
        }
    } else {
        DispatcherRetriesExhaustedException exp = new DispatcherRetriesExhaustedException();
        _log.info("Invoke onError callback as dispatcher retries have exhausted");
        getAsyncCallback().onError(exp);
        curState.switchToClosed();
    }
}

Example 73 with Checkpoint

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

the class ReadEventsRequestProcessor method process.

@Override
public DatabusRequest process(DatabusRequest request) throws IOException, RequestProcessingException, DatabusException {
    boolean isDebug = LOG.isDebugEnabled();
    try {
        ObjectMapper objMapper = new ObjectMapper();
        String checkpointString = request.getParams().getProperty(CHECKPOINT_PARAM, null);
        String checkpointStringMult = request.getParams().getProperty(CHECKPOINT_PARAM_MULT, null);
        int fetchSize = request.getRequiredIntParam(FETCH_SIZE_PARAM);
        String formatStr = request.getRequiredStringParam(OUTPUT_FORMAT_PARAM);
        Encoding enc = Encoding.valueOf(formatStr.toUpperCase());
        String sourcesListStr = request.getParams().getProperty(SOURCES_PARAM, null);
        String subsStr = request.getParams().getProperty(SUBS_PARAM, null);
        String partitionInfoStr = request.getParams().getProperty(PARTITION_INFO_STRING);
        String streamFromLatestSCNStr = request.getParams().getProperty(STREAM_FROM_LATEST_SCN);
        String clientMaxEventVersionStr = request.getParams().getProperty(DatabusHttpHeaders.MAX_EVENT_VERSION);
        int clientEventVersion = (clientMaxEventVersionStr != null) ? Integer.parseInt(clientMaxEventVersionStr) : DbusEventFactory.DBUS_EVENT_V1;
        if (clientEventVersion < 0 || clientEventVersion == 1 || clientEventVersion > DbusEventFactory.DBUS_EVENT_V2) {
            throw new InvalidRequestParamValueException(COMMAND_NAME, DatabusHttpHeaders.MAX_EVENT_VERSION, clientMaxEventVersionStr);
        }
        if (null == sourcesListStr && null == subsStr) {
            throw new InvalidRequestParamValueException(COMMAND_NAME, SOURCES_PARAM + "|" + SUBS_PARAM, "null");
        }
        //TODO for now we separte the code paths to limit the impact on existing Databus 2 deployments (DDSDBUS-79)
        //We have to get rid of this eventually and have a single data path.
        boolean v2Mode = null == subsStr;
        DbusKeyCompositeFilter keyCompositeFilter = null;
        if (null != partitionInfoStr) {
            try {
                Map<Long, DbusKeyFilter> fMap = KeyFilterConfigJSONFactory.parseSrcIdFilterConfigMap(partitionInfoStr);
                keyCompositeFilter = new DbusKeyCompositeFilter();
                keyCompositeFilter.setFilterMap(fMap);
                if (isDebug)
                    LOG.debug("keyCompositeFilter is :" + keyCompositeFilter);
            } catch (Exception ex) {
                String msg = "Got exception while parsing partition Configs. PartitionInfo is:" + partitionInfoStr;
                LOG.error(msg, ex);
                throw new InvalidRequestParamValueException(COMMAND_NAME, PARTITION_INFO_STRING, partitionInfoStr);
            }
        }
        boolean streamFromLatestSCN = false;
        if (null != streamFromLatestSCNStr) {
            streamFromLatestSCN = Boolean.valueOf(streamFromLatestSCNStr);
        }
        long start = System.currentTimeMillis();
        List<DatabusSubscription> subs = null;
        //parse source ids
        SourceIdNameRegistry srcRegistry = _relay.getSourcesIdNameRegistry();
        HashSet<Integer> sourceIds = new HashSet<Integer>();
        if (null != sourcesListStr) {
            String[] sourcesList = sourcesListStr.split(",");
            for (String sourceId : sourcesList) {
                try {
                    Integer srcId = Integer.valueOf(sourceId);
                    sourceIds.add(srcId);
                } catch (NumberFormatException nfe) {
                    HttpStatisticsCollector globalHttpStatsCollector = _relay.getHttpStatisticsCollector();
                    if (null != globalHttpStatsCollector) {
                        globalHttpStatsCollector.registerInvalidStreamRequest();
                    }
                    throw new InvalidRequestParamValueException(COMMAND_NAME, SOURCES_PARAM, sourceId);
                }
            }
        }
        //process explicit subscriptions and generate respective logical partition filters
        NavigableSet<PhysicalPartitionKey> ppartKeys = null;
        if (null != subsStr) {
            List<DatabusSubscription.Builder> subsBuilder = null;
            subsBuilder = objMapper.readValue(subsStr, new TypeReference<List<DatabusSubscription.Builder>>() {
            });
            subs = new ArrayList<DatabusSubscription>(subsBuilder.size());
            for (DatabusSubscription.Builder subBuilder : subsBuilder) {
                subs.add(subBuilder.build());
            }
            ppartKeys = new TreeSet<PhysicalPartitionKey>();
            for (DatabusSubscription sub : subs) {
                PhysicalPartition ppart = sub.getPhysicalPartition();
                if (ppart.isAnyPartitionWildcard()) {
                    ppartKeys = _eventBuffer.getAllPhysicalPartitionKeys();
                    break;
                } else {
                    ppartKeys.add(new PhysicalPartitionKey(ppart));
                }
            }
        }
        // Need to make sure that we don't have tests that send requests in this form.
        if (subs != null && checkpointStringMult == null && checkpointString != null) {
            throw new RequestProcessingException("Both Subscriptions and CheckpointMult should be present");
        }
        //convert source ids into subscriptions
        if (null == subs)
            subs = new ArrayList<DatabusSubscription>();
        for (Integer srcId : sourceIds) {
            LogicalSource lsource = srcRegistry.getSource(srcId);
            if (lsource == null)
                throw new InvalidRequestParamValueException(COMMAND_NAME, SOURCES_PARAM, srcId.toString());
            if (isDebug)
                LOG.debug("registry returns " + lsource + " for srcid=" + srcId);
            DatabusSubscription newSub = DatabusSubscription.createSimpleSourceSubscription(lsource);
            subs.add(newSub);
        }
        DbusFilter ppartFilters = null;
        if (subs.size() > 0) {
            try {
                ppartFilters = _eventBuffer.constructFilters(subs);
            } catch (DatabusException de) {
                throw new RequestProcessingException("unable to generate physical partitions filters:" + de.getMessage(), de);
            }
        }
        ConjunctionDbusFilter filters = new ConjunctionDbusFilter();
        // Source filter comes first
        if (v2Mode)
            filters.addFilter(new SourceDbusFilter(sourceIds));
        else if (null != ppartFilters)
            filters.addFilter(ppartFilters);
        /*
      // Key range filter comes next
      if ((keyMin >0) && (keyMax > 0))
      {
        filters.addFilter(new KeyRangeFilter(keyMin, keyMax));
      }
      */
        if (null != keyCompositeFilter) {
            filters.addFilter(keyCompositeFilter);
        }
        // need to update registerStreamRequest to support Mult checkpoint TODO (DDSDBUS-80)
        // temp solution
        // 3 options:
        // 1. checkpointStringMult not null - generate checkpoint from it
        // 2. checkpointStringMult null, checkpointString not null - create empty CheckpointMult
        // and add create Checkpoint(checkpointString) and add it to cpMult;
        // 3 both are null - create empty CheckpointMult and add empty Checkpoint to it for each ppartition
        PhysicalPartition pPartition;
        Checkpoint cp = null;
        CheckpointMult cpMult = null;
        if (checkpointStringMult != null) {
            try {
                cpMult = new CheckpointMult(checkpointStringMult);
            } catch (InvalidParameterSpecException e) {
                LOG.error("Invalid CheckpointMult:" + checkpointStringMult, e);
                throw new InvalidRequestParamValueException("stream", "CheckpointMult", checkpointStringMult);
            }
        } else {
            // there is no checkpoint - create an empty one
            cpMult = new CheckpointMult();
            Iterator<Integer> it = sourceIds.iterator();
            while (it.hasNext()) {
                Integer srcId = it.next();
                pPartition = _eventBuffer.getPhysicalPartition(srcId);
                if (pPartition == null)
                    throw new RequestProcessingException("unable to find physical partitions for source:" + srcId);
                if (checkpointString != null) {
                    cp = new Checkpoint(checkpointString);
                } else {
                    cp = new Checkpoint();
                    cp.setFlexible();
                }
                cpMult.addCheckpoint(pPartition, cp);
            }
        }
        if (isDebug)
            LOG.debug("checkpointStringMult = " + checkpointStringMult + ";singlecheckpointString=" + checkpointString + ";CPM=" + cpMult);
        // of the server context.
        if (cpMult.getCursorPartition() == null) {
            cpMult.setCursorPartition(request.getCursorPartition());
        }
        if (isDebug) {
            if (cpMult.getCursorPartition() != null) {
                LOG.debug("Using physical paritition cursor " + cpMult.getCursorPartition());
            }
        }
        // for registerStreamRequest we need a single Checkpoint (TODO - fix it) (DDSDBUS-81)
        if (cp == null) {
            Iterator<Integer> it = sourceIds.iterator();
            if (it.hasNext()) {
                Integer srcId = it.next();
                pPartition = _eventBuffer.getPhysicalPartition(srcId);
                cp = cpMult.getCheckpoint(pPartition);
            } else {
                cp = new Checkpoint();
                cp.setFlexible();
            }
        }
        if (null != checkpointString && isDebug)
            LOG.debug("About to stream from cp: " + checkpointString.toString());
        HttpStatisticsCollector globalHttpStatsCollector = _relay.getHttpStatisticsCollector();
        HttpStatisticsCollector connHttpStatsCollector = null;
        if (null != globalHttpStatsCollector) {
            connHttpStatsCollector = (HttpStatisticsCollector) request.getParams().get(globalHttpStatsCollector.getName());
        }
        if (null != globalHttpStatsCollector)
            globalHttpStatsCollector.registerStreamRequest(cp, sourceIds);
        StatsCollectors<DbusEventsStatisticsCollector> statsCollectors = _relay.getOutBoundStatsCollectors();
        try {
            DbusEventBufferBatchReadable bufRead = v2Mode ? _eventBuffer.getDbusEventBufferBatchReadable(sourceIds, cpMult, statsCollectors) : _eventBuffer.getDbusEventBufferBatchReadable(cpMult, ppartKeys, statsCollectors);
            int eventsRead = 0;
            int minPendingEventSize = 0;
            StreamEventsResult result = null;
            bufRead.setClientMaxEventVersion(clientEventVersion);
            if (v2Mode) {
                result = bufRead.streamEvents(streamFromLatestSCN, fetchSize, request.getResponseContent(), enc, filters);
                eventsRead = result.getNumEventsStreamed();
                minPendingEventSize = result.getSizeOfPendingEvent();
                if (isDebug) {
                    LOG.debug("Process: streamed " + eventsRead + " from sources " + Arrays.toString(sourceIds.toArray()));
                    //can be used for debugging to stream from a cp
                    LOG.debug("CP=" + cpMult);
                }
            //if (null != statsCollectors) statsCollectors.mergeStatsCollectors();
            } else {
                result = bufRead.streamEvents(streamFromLatestSCN, fetchSize, request.getResponseContent(), enc, filters);
                eventsRead = result.getNumEventsStreamed();
                minPendingEventSize = result.getSizeOfPendingEvent();
                if (isDebug)
                    LOG.debug("Process: streamed " + eventsRead + " with subscriptions " + subs);
                cpMult = bufRead.getCheckpointMult();
                if (cpMult != null) {
                    request.setCursorPartition(cpMult.getCursorPartition());
                }
            }
            if (eventsRead == 0 && minPendingEventSize > 0) {
                // Append a header to indicate to the client that we do have at least one event to
                // send, but it is too large to fit into client's offered buffer.
                request.getResponseContent().addMetadata(DatabusHttpHeaders.DATABUS_PENDING_EVENT_SIZE, minPendingEventSize);
                LOG.debug("Returning 0 events but have pending event of size " + minPendingEventSize);
            }
        } catch (ScnNotFoundException snfe) {
            if (null != globalHttpStatsCollector) {
                globalHttpStatsCollector.registerScnNotFoundStreamResponse();
            }
            throw new RequestProcessingException(snfe);
        } catch (OffsetNotFoundException snfe) {
            LOG.error("OffsetNotFound", snfe);
            if (null != globalHttpStatsCollector) {
                globalHttpStatsCollector.registerScnNotFoundStreamResponse();
            }
            throw new RequestProcessingException(snfe);
        }
        if (null != connHttpStatsCollector) {
            connHttpStatsCollector.registerStreamResponse(System.currentTimeMillis() - start);
            globalHttpStatsCollector.merge(connHttpStatsCollector);
            connHttpStatsCollector.reset();
        } else if (null != globalHttpStatsCollector) {
            globalHttpStatsCollector.registerStreamResponse(System.currentTimeMillis() - start);
        }
    } catch (InvalidRequestParamValueException e) {
        HttpStatisticsCollector globalHttpStatsCollector = _relay.getHttpStatisticsCollector();
        if (null != globalHttpStatsCollector) {
            globalHttpStatsCollector.registerInvalidStreamRequest();
        }
        throw e;
    }
    return request;
}

Example 74 with Checkpoint

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

the class FileSystemCheckpointPersistenceProvider method loadCheckpointInternal.

private Checkpoint loadCheckpointInternal(List<String> sourceNames, RegistrationId registrationId) {
    String streamId = calcStreamId(sourceNames);
    try {
        CacheEntry cacheEntry = doLoadCheckpoint(sourceNames, streamId, registrationId);
        Checkpoint result = (null == cacheEntry) ? null : cacheEntry.getCheckpoint();
        return result;
    } catch (IOException ioe) {
        LOG.error("Error loading checkpoint", ioe);
        return null;
    }
}

Example 75 with Checkpoint

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

the class ClusterCheckpointPersistenceProvider method getCheckpoint.

/**
     * internal function that fetches contents from Helix property store
     * 
     * @param key
     * @return checkpoint or null
     */
private Checkpoint getCheckpoint(String key) {
    ZNRecord zn = _propertyStore.get(key, null, AccessOption.PERSISTENT);
    if (zn != null) {
        String v = zn.getSimpleField(KEY_CHECKPOINT);
        try {
            Checkpoint cp;
            cp = new Checkpoint(v);
            return cp;
        } catch (JsonParseException e) {
            LOG.error("Cannot deserialize value for key=" + key + " value=" + v + " exception=" + e);
        } catch (JsonMappingException e) {
            LOG.error("Cannot deserialize value for key=" + key + " value=" + v + " exception=" + e);
        } catch (IOException e) {
            LOG.error("Cannot deserialize value for key=" + key + " value=" + v + " exception=" + e);
        }
    } else {
        LOG.error("No record for key = " + key);
    }
    return null;
}