Examples with Sequence io.druid.java.util.common.guava.Sequence used on opensource projects

Example 1 with Sequence

use of io.druid.java.util.common.guava.Sequence in project druid by druid-io.

the class CachingClusteredClient method run.

@Override
public Sequence<T> run(final Query<T> query, final Map<String, Object> responseContext) {
    final QueryToolChest<T, Query<T>> toolChest = warehouse.getToolChest(query);
    final CacheStrategy<T, Object, Query<T>> strategy = toolChest.getCacheStrategy(query);
    final Map<DruidServer, List<SegmentDescriptor>> serverSegments = Maps.newTreeMap();
    final List<Pair<Interval, byte[]>> cachedResults = Lists.newArrayList();
    final Map<String, CachePopulator> cachePopulatorMap = Maps.newHashMap();
    final boolean useCache = CacheUtil.useCacheOnBrokers(query, strategy, cacheConfig);
    final boolean populateCache = CacheUtil.populateCacheOnBrokers(query, strategy, cacheConfig);
    final boolean isBySegment = BaseQuery.getContextBySegment(query, false);
    final ImmutableMap.Builder<String, Object> contextBuilder = new ImmutableMap.Builder<>();
    final int priority = BaseQuery.getContextPriority(query, 0);
    contextBuilder.put("priority", priority);
    if (populateCache) {
        // prevent down-stream nodes from caching results as well if we are populating the cache
        contextBuilder.put(CacheConfig.POPULATE_CACHE, false);
        contextBuilder.put("bySegment", true);
    }
    TimelineLookup<String, ServerSelector> timeline = serverView.getTimeline(query.getDataSource());
    if (timeline == null) {
        return Sequences.empty();
    }
    // build set of segments to query
    Set<Pair<ServerSelector, SegmentDescriptor>> segments = Sets.newLinkedHashSet();
    List<TimelineObjectHolder<String, ServerSelector>> serversLookup = Lists.newLinkedList();
    // Note that enabling this leads to putting uncovered intervals information in the response headers
    // and might blow up in some cases https://github.com/druid-io/druid/issues/2108
    int uncoveredIntervalsLimit = BaseQuery.getContextUncoveredIntervalsLimit(query, 0);
    if (uncoveredIntervalsLimit > 0) {
        List<Interval> uncoveredIntervals = Lists.newArrayListWithCapacity(uncoveredIntervalsLimit);
        boolean uncoveredIntervalsOverflowed = false;
        for (Interval interval : query.getIntervals()) {
            Iterable<TimelineObjectHolder<String, ServerSelector>> lookup = timeline.lookup(interval);
            long startMillis = interval.getStartMillis();
            long endMillis = interval.getEndMillis();
            for (TimelineObjectHolder<String, ServerSelector> holder : lookup) {
                Interval holderInterval = holder.getInterval();
                long intervalStart = holderInterval.getStartMillis();
                if (!uncoveredIntervalsOverflowed && startMillis != intervalStart) {
                    if (uncoveredIntervalsLimit > uncoveredIntervals.size()) {
                        uncoveredIntervals.add(new Interval(startMillis, intervalStart));
                    } else {
                        uncoveredIntervalsOverflowed = true;
                    }
                }
                startMillis = holderInterval.getEndMillis();
                serversLookup.add(holder);
            }
            if (!uncoveredIntervalsOverflowed && startMillis < endMillis) {
                if (uncoveredIntervalsLimit > uncoveredIntervals.size()) {
                    uncoveredIntervals.add(new Interval(startMillis, endMillis));
                } else {
                    uncoveredIntervalsOverflowed = true;
                }
            }
        }
        if (!uncoveredIntervals.isEmpty()) {
            // This returns intervals for which NO segment is present.
            // Which is not necessarily an indication that the data doesn't exist or is
            // incomplete. The data could exist and just not be loaded yet.  In either
            // case, though, this query will not include any data from the identified intervals.
            responseContext.put("uncoveredIntervals", uncoveredIntervals);
            responseContext.put("uncoveredIntervalsOverflowed", uncoveredIntervalsOverflowed);
        }
    } else {
        for (Interval interval : query.getIntervals()) {
            Iterables.addAll(serversLookup, timeline.lookup(interval));
        }
    }
    // Let tool chest filter out unneeded segments
    final List<TimelineObjectHolder<String, ServerSelector>> filteredServersLookup = toolChest.filterSegments(query, serversLookup);
    Map<String, Optional<RangeSet<String>>> dimensionRangeCache = Maps.newHashMap();
    // Filter unneeded chunks based on partition dimension
    for (TimelineObjectHolder<String, ServerSelector> holder : filteredServersLookup) {
        final Set<PartitionChunk<ServerSelector>> filteredChunks = DimFilterUtils.filterShards(query.getFilter(), holder.getObject(), new Function<PartitionChunk<ServerSelector>, ShardSpec>() {

            @Override
            public ShardSpec apply(PartitionChunk<ServerSelector> input) {
                return input.getObject().getSegment().getShardSpec();
            }
        }, dimensionRangeCache);
        for (PartitionChunk<ServerSelector> chunk : filteredChunks) {
            ServerSelector selector = chunk.getObject();
            final SegmentDescriptor descriptor = new SegmentDescriptor(holder.getInterval(), holder.getVersion(), chunk.getChunkNumber());
            segments.add(Pair.of(selector, descriptor));
        }
    }
    final byte[] queryCacheKey;
    if (// implies strategy != null
    (populateCache || useCache) && // explicit bySegment queries are never cached
    !isBySegment) {
        queryCacheKey = strategy.computeCacheKey(query);
    } else {
        queryCacheKey = null;
    }
    if (query.getContext().get(QueryResource.HDR_IF_NONE_MATCH) != null) {
        String prevEtag = (String) query.getContext().get(QueryResource.HDR_IF_NONE_MATCH);
        //compute current Etag
        Hasher hasher = Hashing.sha1().newHasher();
        boolean hasOnlyHistoricalSegments = true;
        for (Pair<ServerSelector, SegmentDescriptor> p : segments) {
            if (!p.lhs.pick().getServer().isAssignable()) {
                hasOnlyHistoricalSegments = false;
                break;
            }
            hasher.putString(p.lhs.getSegment().getIdentifier(), Charsets.UTF_8);
        }
        if (hasOnlyHistoricalSegments) {
            hasher.putBytes(queryCacheKey == null ? strategy.computeCacheKey(query) : queryCacheKey);
            String currEtag = Base64.encodeBase64String(hasher.hash().asBytes());
            responseContext.put(QueryResource.HDR_ETAG, currEtag);
            if (prevEtag.equals(currEtag)) {
                return Sequences.empty();
            }
        }
    }
    if (queryCacheKey != null) {
        // cachKeys map must preserve segment ordering, in order for shards to always be combined in the same order
        Map<Pair<ServerSelector, SegmentDescriptor>, Cache.NamedKey> cacheKeys = Maps.newLinkedHashMap();
        for (Pair<ServerSelector, SegmentDescriptor> segment : segments) {
            final Cache.NamedKey segmentCacheKey = CacheUtil.computeSegmentCacheKey(segment.lhs.getSegment().getIdentifier(), segment.rhs, queryCacheKey);
            cacheKeys.put(segment, segmentCacheKey);
        }
        // Pull cached segments from cache and remove from set of segments to query
        final Map<Cache.NamedKey, byte[]> cachedValues;
        if (useCache) {
            cachedValues = cache.getBulk(Iterables.limit(cacheKeys.values(), cacheConfig.getCacheBulkMergeLimit()));
        } else {
            cachedValues = ImmutableMap.of();
        }
        for (Map.Entry<Pair<ServerSelector, SegmentDescriptor>, Cache.NamedKey> entry : cacheKeys.entrySet()) {
            Pair<ServerSelector, SegmentDescriptor> segment = entry.getKey();
            Cache.NamedKey segmentCacheKey = entry.getValue();
            final Interval segmentQueryInterval = segment.rhs.getInterval();
            final byte[] cachedValue = cachedValues.get(segmentCacheKey);
            if (cachedValue != null) {
                // remove cached segment from set of segments to query
                segments.remove(segment);
                cachedResults.add(Pair.of(segmentQueryInterval, cachedValue));
            } else if (populateCache) {
                // otherwise, if populating cache, add segment to list of segments to cache
                final String segmentIdentifier = segment.lhs.getSegment().getIdentifier();
                cachePopulatorMap.put(String.format("%s_%s", segmentIdentifier, segmentQueryInterval), new CachePopulator(cache, objectMapper, segmentCacheKey));
            }
        }
    }
    // Compile list of all segments not pulled from cache
    for (Pair<ServerSelector, SegmentDescriptor> segment : segments) {
        final QueryableDruidServer queryableDruidServer = segment.lhs.pick();
        if (queryableDruidServer == null) {
            log.makeAlert("No servers found for SegmentDescriptor[%s] for DataSource[%s]?! How can this be?!", segment.rhs, query.getDataSource()).emit();
        } else {
            final DruidServer server = queryableDruidServer.getServer();
            List<SegmentDescriptor> descriptors = serverSegments.get(server);
            if (descriptors == null) {
                descriptors = Lists.newArrayList();
                serverSegments.put(server, descriptors);
            }
            descriptors.add(segment.rhs);
        }
    }
    return new LazySequence<>(new Supplier<Sequence<T>>() {

        @Override
        public Sequence<T> get() {
            ArrayList<Sequence<T>> sequencesByInterval = Lists.newArrayList();
            addSequencesFromCache(sequencesByInterval);
            addSequencesFromServer(sequencesByInterval);
            return mergeCachedAndUncachedSequences(query, sequencesByInterval);
        }

        private void addSequencesFromCache(ArrayList<Sequence<T>> listOfSequences) {
            if (strategy == null) {
                return;
            }
            final Function<Object, T> pullFromCacheFunction = strategy.pullFromCache();
            final TypeReference<Object> cacheObjectClazz = strategy.getCacheObjectClazz();
            for (Pair<Interval, byte[]> cachedResultPair : cachedResults) {
                final byte[] cachedResult = cachedResultPair.rhs;
                Sequence<Object> cachedSequence = new BaseSequence<>(new BaseSequence.IteratorMaker<Object, Iterator<Object>>() {

                    @Override
                    public Iterator<Object> make() {
                        try {
                            if (cachedResult.length == 0) {
                                return Iterators.emptyIterator();
                            }
                            return objectMapper.readValues(objectMapper.getFactory().createParser(cachedResult), cacheObjectClazz);
                        } catch (IOException e) {
                            throw Throwables.propagate(e);
                        }
                    }

                    @Override
                    public void cleanup(Iterator<Object> iterFromMake) {
                    }
                });
                listOfSequences.add(Sequences.map(cachedSequence, pullFromCacheFunction));
            }
        }

        private void addSequencesFromServer(ArrayList<Sequence<T>> listOfSequences) {
            listOfSequences.ensureCapacity(listOfSequences.size() + serverSegments.size());
            final Query<T> rewrittenQuery = query.withOverriddenContext(contextBuilder.build());
            // The data gets handled as a Future and parsed in the long Sequence chain in the resultSeqToAdd setter.
            for (Map.Entry<DruidServer, List<SegmentDescriptor>> entry : serverSegments.entrySet()) {
                final DruidServer server = entry.getKey();
                final List<SegmentDescriptor> descriptors = entry.getValue();
                final QueryRunner clientQueryable = serverView.getQueryRunner(server);
                if (clientQueryable == null) {
                    log.error("WTF!? server[%s] doesn't have a client Queryable?", server);
                    continue;
                }
                final MultipleSpecificSegmentSpec segmentSpec = new MultipleSpecificSegmentSpec(descriptors);
                final Sequence<T> resultSeqToAdd;
                if (!server.isAssignable() || !populateCache || isBySegment) {
                    // Direct server queryable
                    if (!isBySegment) {
                        resultSeqToAdd = clientQueryable.run(query.withQuerySegmentSpec(segmentSpec), responseContext);
                    } else {
                        // bySegment queries need to be de-serialized, see DirectDruidClient.run()
                        @SuppressWarnings("unchecked") final Query<Result<BySegmentResultValueClass<T>>> bySegmentQuery = (Query<Result<BySegmentResultValueClass<T>>>) ((Query) query);
                        @SuppressWarnings("unchecked") final Sequence<Result<BySegmentResultValueClass<T>>> resultSequence = clientQueryable.run(bySegmentQuery.withQuerySegmentSpec(segmentSpec), responseContext);
                        resultSeqToAdd = (Sequence) Sequences.map(resultSequence, new Function<Result<BySegmentResultValueClass<T>>, Result<BySegmentResultValueClass<T>>>() {

                            @Override
                            public Result<BySegmentResultValueClass<T>> apply(Result<BySegmentResultValueClass<T>> input) {
                                final BySegmentResultValueClass<T> bySegmentValue = input.getValue();
                                return new Result<>(input.getTimestamp(), new BySegmentResultValueClass<T>(Lists.transform(bySegmentValue.getResults(), toolChest.makePreComputeManipulatorFn(query, MetricManipulatorFns.deserializing())), bySegmentValue.getSegmentId(), bySegmentValue.getInterval()));
                            }
                        });
                    }
                } else {
                    // Requires some manipulation on broker side
                    @SuppressWarnings("unchecked") final Sequence<Result<BySegmentResultValueClass<T>>> runningSequence = clientQueryable.run(rewrittenQuery.withQuerySegmentSpec(segmentSpec), responseContext);
                    resultSeqToAdd = new MergeSequence(query.getResultOrdering(), Sequences.<Result<BySegmentResultValueClass<T>>, Sequence<T>>map(runningSequence, new Function<Result<BySegmentResultValueClass<T>>, Sequence<T>>() {

                        private final Function<T, Object> cacheFn = strategy.prepareForCache();

                        // Acctually do something with the results
                        @Override
                        public Sequence<T> apply(Result<BySegmentResultValueClass<T>> input) {
                            final BySegmentResultValueClass<T> value = input.getValue();
                            final CachePopulator cachePopulator = cachePopulatorMap.get(String.format("%s_%s", value.getSegmentId(), value.getInterval()));
                            final Queue<ListenableFuture<Object>> cacheFutures = new ConcurrentLinkedQueue<>();
                            return Sequences.<T>withEffect(Sequences.<T, T>map(Sequences.<T, T>map(Sequences.<T>simple(value.getResults()), new Function<T, T>() {

                                @Override
                                public T apply(final T input) {
                                    if (cachePopulator != null) {
                                        // only compute cache data if populating cache
                                        cacheFutures.add(backgroundExecutorService.submit(new Callable<Object>() {

                                            @Override
                                            public Object call() {
                                                return cacheFn.apply(input);
                                            }
                                        }));
                                    }
                                    return input;
                                }
                            }), toolChest.makePreComputeManipulatorFn(// This casting is sub-optimal, but hasn't caused any major problems yet...
                            (Query) rewrittenQuery, MetricManipulatorFns.deserializing())), new Runnable() {

                                @Override
                                public void run() {
                                    if (cachePopulator != null) {
                                        Futures.addCallback(Futures.allAsList(cacheFutures), new FutureCallback<List<Object>>() {

                                            @Override
                                            public void onSuccess(List<Object> cacheData) {
                                                cachePopulator.populate(cacheData);
                                                // Help out GC by making sure all references are gone
                                                cacheFutures.clear();
                                            }

                                            @Override
                                            public void onFailure(Throwable throwable) {
                                                log.error(throwable, "Background caching failed");
                                            }
                                        }, backgroundExecutorService);
                                    }
                                }
                            }, MoreExecutors.sameThreadExecutor());
                        // End withEffect
                        }
                    }));
                }
                listOfSequences.add(resultSeqToAdd);
            }
        }
    });
}

Example 2 with Sequence

use of io.druid.java.util.common.guava.Sequence in project druid by druid-io.

the class DirectDruidClientTest method testCancel.

@Test
public void testCancel() throws Exception {
    HttpClient httpClient = EasyMock.createStrictMock(HttpClient.class);
    Capture<Request> capturedRequest = EasyMock.newCapture();
    ListenableFuture<Object> cancelledFuture = Futures.immediateCancelledFuture();
    SettableFuture<Object> cancellationFuture = SettableFuture.create();
    EasyMock.expect(httpClient.go(EasyMock.capture(capturedRequest), EasyMock.<HttpResponseHandler>anyObject())).andReturn(cancelledFuture).once();
    EasyMock.expect(httpClient.go(EasyMock.capture(capturedRequest), EasyMock.<HttpResponseHandler>anyObject())).andReturn(cancellationFuture).once();
    EasyMock.replay(httpClient);
    final ServerSelector serverSelector = new ServerSelector(new DataSegment("test", new Interval("2013-01-01/2013-01-02"), new DateTime("2013-01-01").toString(), Maps.<String, Object>newHashMap(), Lists.<String>newArrayList(), Lists.<String>newArrayList(), NoneShardSpec.instance(), 0, 0L), new HighestPriorityTierSelectorStrategy(new ConnectionCountServerSelectorStrategy()));
    DirectDruidClient client1 = new DirectDruidClient(new ReflectionQueryToolChestWarehouse(), QueryRunnerTestHelper.NOOP_QUERYWATCHER, new DefaultObjectMapper(), httpClient, "foo", new NoopServiceEmitter());
    QueryableDruidServer queryableDruidServer1 = new QueryableDruidServer(new DruidServer("test1", "localhost", 0, "historical", DruidServer.DEFAULT_TIER, 0), client1);
    serverSelector.addServerAndUpdateSegment(queryableDruidServer1, serverSelector.getSegment());
    TimeBoundaryQuery query = Druids.newTimeBoundaryQueryBuilder().dataSource("test").build();
    HashMap<String, List> context = Maps.newHashMap();
    cancellationFuture.set(new StatusResponseHolder(HttpResponseStatus.OK, new StringBuilder("cancelled")));
    Sequence results = client1.run(query, context);
    Assert.assertEquals(HttpMethod.DELETE, capturedRequest.getValue().getMethod());
    Assert.assertEquals(0, client1.getNumOpenConnections());
    QueryInterruptedException exception = null;
    try {
        Sequences.toList(results, Lists.newArrayList());
    } catch (QueryInterruptedException e) {
        exception = e;
    }
    Assert.assertNotNull(exception);
    EasyMock.verify(httpClient);
}

Example 3 with Sequence

use of io.druid.java.util.common.guava.Sequence in project druid by druid-io.

the class DumpSegment method runDump.

private void runDump(final Injector injector, final QueryableIndex index) throws IOException {
    final ObjectMapper objectMapper = injector.getInstance(Key.get(ObjectMapper.class, Json.class));
    final QueryableIndexStorageAdapter adapter = new QueryableIndexStorageAdapter(index);
    final List<String> columnNames = getColumnsToInclude(index);
    final DimFilter filter = filterJson != null ? objectMapper.readValue(filterJson, DimFilter.class) : null;
    final Sequence<Cursor> cursors = adapter.makeCursors(Filters.toFilter(filter), index.getDataInterval().withChronology(ISOChronology.getInstanceUTC()), VirtualColumns.EMPTY, Granularities.ALL, false);
    withOutputStream(new Function<OutputStream, Object>() {

        @Override
        public Object apply(final OutputStream out) {
            final Sequence<Object> sequence = Sequences.map(cursors, new Function<Cursor, Object>() {

                @Override
                public Object apply(Cursor cursor) {
                    final List<ObjectColumnSelector> selectors = Lists.newArrayList();
                    for (String columnName : columnNames) {
                        selectors.add(makeSelector(columnName, index.getColumn(columnName), cursor));
                    }
                    while (!cursor.isDone()) {
                        final Map<String, Object> row = Maps.newLinkedHashMap();
                        for (int i = 0; i < columnNames.size(); i++) {
                            final String columnName = columnNames.get(i);
                            final Object value = selectors.get(i).get();
                            if (timeISO8601 && columnNames.get(i).equals(Column.TIME_COLUMN_NAME)) {
                                row.put(columnName, new DateTime(value, DateTimeZone.UTC).toString());
                            } else {
                                row.put(columnName, value);
                            }
                        }
                        try {
                            out.write(objectMapper.writeValueAsBytes(row));
                            out.write('\n');
                        } catch (IOException e) {
                            throw Throwables.propagate(e);
                        }
                        cursor.advance();
                    }
                    return null;
                }
            });
            evaluateSequenceForSideEffects(sequence);
            return null;
        }
    });
}

Example 4 with Sequence

use of io.druid.java.util.common.guava.Sequence in project druid by druid-io.

the class DruidPlanner method planWithBindableConvention.

private PlannerResult planWithBindableConvention(final SqlExplain explain, final RelRoot root) throws RelConversionException {
    BindableRel bindableRel = (BindableRel) planner.transform(Rules.BINDABLE_CONVENTION_RULES, planner.getEmptyTraitSet().replace(BindableConvention.INSTANCE).plus(root.collation), root.rel);
    if (!root.isRefTrivial()) {
        // Add a projection on top to accommodate root.fields.
        final List<RexNode> projects = new ArrayList<>();
        final RexBuilder rexBuilder = bindableRel.getCluster().getRexBuilder();
        for (int field : Pair.left(root.fields)) {
            projects.add(rexBuilder.makeInputRef(bindableRel, field));
        }
        bindableRel = new Bindables.BindableProject(bindableRel.getCluster(), bindableRel.getTraitSet(), bindableRel, projects, root.validatedRowType);
    }
    if (explain != null) {
        return planExplanation(bindableRel, explain);
    } else {
        final BindableRel theRel = bindableRel;
        final DataContext dataContext = plannerContext.createDataContext((JavaTypeFactory) planner.getTypeFactory());
        final Supplier<Sequence<Object[]>> resultsSupplier = new Supplier<Sequence<Object[]>>() {

            @Override
            public Sequence<Object[]> get() {
                final Enumerable enumerable = theRel.bind(dataContext);
                return Sequences.simple(enumerable);
            }
        };
        return new PlannerResult(resultsSupplier, root.validatedRowType);
    }
}

Example 5 with Sequence

use of io.druid.java.util.common.guava.Sequence in project druid by druid-io.

the class DruidPlanner method planExplanation.

private PlannerResult planExplanation(final RelNode rel, final SqlExplain explain) {
    final String explanation = RelOptUtil.dumpPlan("", rel, explain.getFormat(), explain.getDetailLevel());
    final Supplier<Sequence<Object[]>> resultsSupplier = Suppliers.ofInstance(Sequences.simple(ImmutableList.of(new Object[] { explanation })));
    final RelDataTypeFactory typeFactory = rel.getCluster().getTypeFactory();
    return new PlannerResult(resultsSupplier, typeFactory.createStructType(ImmutableList.of(typeFactory.createSqlType(SqlTypeName.VARCHAR)), ImmutableList.of("PLAN")));
}