Examples with FireHydrant org.apache.druid.segment.realtime.FireHydrant used on opensource projects

Example 36 with FireHydrant

use of org.apache.druid.segment.realtime.FireHydrant in project druid by druid-io.

the class StreamAppenderator method abandonSegment.

private ListenableFuture<?> abandonSegment(final SegmentIdWithShardSpec identifier, final Sink sink, final boolean removeOnDiskData) {
    // Ensure no future writes will be made to this sink.
    if (sink.finishWriting()) {
        // Decrement this sink's rows from the counters. we only count active sinks so that we don't double decrement,
        // i.e. those that haven't been persisted for *InMemory counters, or pushed to deep storage for the total counter.
        rowsCurrentlyInMemory.addAndGet(-sink.getNumRowsInMemory());
        bytesCurrentlyInMemory.addAndGet(-sink.getBytesInMemory());
        bytesCurrentlyInMemory.addAndGet(-calculateSinkMemoryInUsed(sink));
        for (FireHydrant hydrant : sink) {
            // Decrement memory used by all Memory Mapped Hydrant
            if (!hydrant.equals(sink.getCurrHydrant())) {
                bytesCurrentlyInMemory.addAndGet(-calculateMMappedHydrantMemoryInUsed(hydrant));
            }
        }
        totalRows.addAndGet(-sink.getNumRows());
    }
    // Mark this identifier as dropping, so no future push tasks will pick it up.
    droppingSinks.add(identifier);
    // Wait for any outstanding pushes to finish, then abandon the segment inside the persist thread.
    return Futures.transform(pushBarrier(), new Function<Object, Void>() {

        @Nullable
        @Override
        public Void apply(@Nullable Object input) {
            if (!sinks.remove(identifier, sink)) {
                log.error("Sink for segment[%s] no longer valid, not abandoning.", identifier);
                return null;
            }
            metrics.setSinkCount(sinks.size());
            if (removeOnDiskData) {
                // Remove this segment from the committed list. This must be done from the persist thread.
                log.debug("Removing commit metadata for segment[%s].", identifier);
                try {
                    commitLock.lock();
                    final Committed oldCommit = readCommit();
                    if (oldCommit != null) {
                        writeCommit(oldCommit.without(identifier.toString()));
                    }
                } catch (Exception e) {
                    log.makeAlert(e, "Failed to update committed segments[%s]", schema.getDataSource()).addData("identifier", identifier.toString()).emit();
                    throw new RuntimeException(e);
                } finally {
                    commitLock.unlock();
                }
            }
            // Unannounce the segment.
            try {
                segmentAnnouncer.unannounceSegment(sink.getSegment());
            } catch (Exception e) {
                log.makeAlert(e, "Failed to unannounce segment[%s]", schema.getDataSource()).addData("identifier", identifier.toString()).emit();
            }
            droppingSinks.remove(identifier);
            sinkTimeline.remove(sink.getInterval(), sink.getVersion(), identifier.getShardSpec().createChunk(sink));
            for (FireHydrant hydrant : sink) {
                if (cache != null) {
                    cache.close(SinkQuerySegmentWalker.makeHydrantCacheIdentifier(hydrant));
                }
                hydrant.swapSegment(null);
            }
            if (removeOnDiskData) {
                removeDirectory(computePersistDir(identifier));
            }
            log.info("Dropped segment[%s].", identifier);
            return null;
        }
    }, // starting to abandon segments
    persistExecutor);
}

Example 37 with FireHydrant

use of org.apache.druid.segment.realtime.FireHydrant in project druid by druid-io.

the class RealtimePlumber method bootstrapSinksFromDisk.

protected Object bootstrapSinksFromDisk() {
    final VersioningPolicy versioningPolicy = config.getVersioningPolicy();
    File baseDir = computeBaseDir(schema);
    if (baseDir == null || !baseDir.exists()) {
        return null;
    }
    File[] files = baseDir.listFiles();
    if (files == null) {
        return null;
    }
    Object metadata = null;
    long latestCommitTime = 0;
    for (File sinkDir : files) {
        final Interval sinkInterval = Intervals.of(sinkDir.getName().replace('_', '/'));
        // final File[] sinkFiles = sinkDir.listFiles();
        // To avoid reading and listing of "merged" dir
        final File[] sinkFiles = sinkDir.listFiles(new FilenameFilter() {

            @Override
            public boolean accept(File dir, String fileName) {
                return !(Ints.tryParse(fileName) == null);
            }
        });
        Arrays.sort(sinkFiles, new Comparator<File>() {

            @Override
            public int compare(File o1, File o2) {
                try {
                    return Ints.compare(Integer.parseInt(o1.getName()), Integer.parseInt(o2.getName()));
                } catch (NumberFormatException e) {
                    log.error(e, "Couldn't compare as numbers? [%s][%s]", o1, o2);
                    return o1.compareTo(o2);
                }
            }
        });
        boolean isCorrupted = false;
        List<FireHydrant> hydrants = new ArrayList<>();
        for (File segmentDir : sinkFiles) {
            log.info("Loading previously persisted segment at [%s]", segmentDir);
            // If 100% sure that this is not needed, this check can be removed.
            if (Ints.tryParse(segmentDir.getName()) == null) {
                continue;
            }
            QueryableIndex queryableIndex = null;
            try {
                queryableIndex = indexIO.loadIndex(segmentDir);
            } catch (IOException e) {
                log.error(e, "Problem loading segmentDir from disk.");
                isCorrupted = true;
            }
            if (isCorrupted) {
                try {
                    File corruptSegmentDir = computeCorruptedFileDumpDir(segmentDir, schema);
                    log.info("Renaming %s to %s", segmentDir.getAbsolutePath(), corruptSegmentDir.getAbsolutePath());
                    org.apache.commons.io.FileUtils.copyDirectory(segmentDir, corruptSegmentDir);
                    FileUtils.deleteDirectory(segmentDir);
                } catch (Exception e1) {
                    log.error(e1, "Failed to rename %s", segmentDir.getAbsolutePath());
                }
                // at some point.
                continue;
            }
            Metadata segmentMetadata = queryableIndex.getMetadata();
            if (segmentMetadata != null) {
                Object timestampObj = segmentMetadata.get(COMMIT_METADATA_TIMESTAMP_KEY);
                if (timestampObj != null) {
                    long timestamp = ((Long) timestampObj).longValue();
                    if (timestamp > latestCommitTime) {
                        log.info("Found metaData [%s] with latestCommitTime [%s] greater than previous recorded [%s]", queryableIndex.getMetadata(), timestamp, latestCommitTime);
                        latestCommitTime = timestamp;
                        metadata = queryableIndex.getMetadata().get(COMMIT_METADATA_KEY);
                    }
                }
            }
            hydrants.add(new FireHydrant(new QueryableIndexSegment(queryableIndex, SegmentId.of(schema.getDataSource(), sinkInterval, versioningPolicy.getVersion(sinkInterval), config.getShardSpec())), Integer.parseInt(segmentDir.getName())));
        }
        if (hydrants.isEmpty()) {
            // Probably encountered a corrupt sink directory
            log.warn("Found persisted segment directory with no intermediate segments present at %s, skipping sink creation.", sinkDir.getAbsolutePath());
            continue;
        }
        final Sink currSink = new Sink(sinkInterval, schema, config.getShardSpec(), versioningPolicy.getVersion(sinkInterval), config.getAppendableIndexSpec(), config.getMaxRowsInMemory(), config.getMaxBytesInMemoryOrDefault(), true, config.getDedupColumn(), hydrants);
        addSink(currSink);
    }
    return metadata;
}

Example 38 with FireHydrant

use of org.apache.druid.segment.realtime.FireHydrant in project druid by druid-io.

the class RealtimePlumber method persistAndMerge.

// Submits persist-n-merge task for a Sink to the mergeExecutor
private void persistAndMerge(final long truncatedTime, final Sink sink) {
    final String threadName = StringUtils.format("%s-%s-persist-n-merge", schema.getDataSource(), DateTimes.utc(truncatedTime));
    mergeExecutor.execute(new ThreadRenamingRunnable(threadName) {

        final Interval interval = sink.getInterval();

        Stopwatch mergeStopwatch = null;

        @Override
        public void doRun() {
            try {
                // Bail out if this sink has been abandoned by a previously-executed task.
                if (sinks.get(truncatedTime) != sink) {
                    log.info("Sink[%s] was abandoned, bailing out of persist-n-merge.", sink);
                    return;
                }
                // Use a file to indicate that pushing has completed.
                final File persistDir = computePersistDir(schema, interval);
                final File mergedTarget = new File(persistDir, "merged");
                final File isPushedMarker = new File(persistDir, "isPushedMarker");
                if (!isPushedMarker.exists()) {
                    removeSegment(sink, mergedTarget);
                    if (mergedTarget.exists()) {
                        log.warn("Merged target[%s] still exists after attempt to delete it; skipping push.", mergedTarget);
                        return;
                    }
                } else {
                    log.info("Already pushed sink[%s]", sink);
                    return;
                }
                /*
            Note: it the plumber crashes after persisting a subset of hydrants then might duplicate data as these
            hydrants will be read but older commitMetadata will be used. fixing this possibly needs structural
            changes to plumber.
             */
                for (FireHydrant hydrant : sink) {
                    synchronized (hydrant) {
                        if (!hydrant.hasSwapped()) {
                            log.info("Hydrant[%s] hasn't swapped yet, swapping. Sink[%s]", hydrant, sink);
                            final int rowCount = persistHydrant(hydrant, schema, interval, null);
                            metrics.incrementRowOutputCount(rowCount);
                        }
                    }
                }
                final long mergeThreadCpuTime = JvmUtils.safeGetThreadCpuTime();
                mergeStopwatch = Stopwatch.createStarted();
                final File mergedFile;
                List<QueryableIndex> indexes = new ArrayList<>();
                Closer closer = Closer.create();
                try {
                    for (FireHydrant fireHydrant : sink) {
                        Pair<ReferenceCountingSegment, Closeable> segmentAndCloseable = fireHydrant.getAndIncrementSegment();
                        final QueryableIndex queryableIndex = segmentAndCloseable.lhs.asQueryableIndex();
                        log.info("Adding hydrant[%s]", fireHydrant);
                        indexes.add(queryableIndex);
                        closer.register(segmentAndCloseable.rhs);
                    }
                    mergedFile = indexMerger.mergeQueryableIndex(indexes, schema.getGranularitySpec().isRollup(), schema.getAggregators(), null, mergedTarget, config.getIndexSpec(), config.getIndexSpecForIntermediatePersists(), new BaseProgressIndicator(), config.getSegmentWriteOutMediumFactory(), -1);
                } catch (Throwable t) {
                    throw closer.rethrow(t);
                } finally {
                    closer.close();
                }
                // emit merge metrics before publishing segment
                metrics.incrementMergeCpuTime(JvmUtils.safeGetThreadCpuTime() - mergeThreadCpuTime);
                metrics.incrementMergeTimeMillis(mergeStopwatch.elapsed(TimeUnit.MILLISECONDS));
                log.info("Pushing [%s] to deep storage", sink.getSegment().getId());
                DataSegment segment = dataSegmentPusher.push(mergedFile, sink.getSegment().withDimensions(IndexMerger.getMergedDimensionsFromQueryableIndexes(indexes, schema.getDimensionsSpec())), false);
                log.info("Inserting [%s] to the metadata store", sink.getSegment().getId());
                segmentPublisher.publishSegment(segment);
                if (!isPushedMarker.createNewFile()) {
                    log.makeAlert("Failed to create marker file for [%s]", schema.getDataSource()).addData("interval", sink.getInterval()).addData("partitionNum", segment.getShardSpec().getPartitionNum()).addData("marker", isPushedMarker).emit();
                }
            } catch (Exception e) {
                metrics.incrementFailedHandoffs();
                log.makeAlert(e, "Failed to persist merged index[%s]", schema.getDataSource()).addData("interval", interval).emit();
                if (shuttingDown) {
                    // We're trying to shut down, and this segment failed to push. Let's just get rid of it.
                    // This call will also delete possibly-partially-written files, so we don't need to do it explicitly.
                    cleanShutdown = false;
                    abandonSegment(truncatedTime, sink);
                }
            } finally {
                if (mergeStopwatch != null) {
                    mergeStopwatch.stop();
                }
            }
        }
    });
    handoffNotifier.registerSegmentHandoffCallback(new SegmentDescriptor(sink.getInterval(), sink.getVersion(), config.getShardSpec().getPartitionNum()), mergeExecutor, new Runnable() {

        @Override
        public void run() {
            abandonSegment(sink.getInterval().getStartMillis(), sink);
            metrics.incrementHandOffCount();
        }
    });
}