drcrallen commented on a change in pull request #5913: Move Caching Cluster
Client to java streams and allow parallel intermediate merges
URL: https://github.com/apache/incubator-druid/pull/5913#discussion_r213754069
##########
File path:
processing/src/main/java/io/druid/query/ChainedExecutionQueryRunner.java
##########
@@ -70,87 +74,115 @@ public ChainedExecutionQueryRunner(
QueryRunner<T>... queryables
)
{
- this(exec, queryWatcher, Arrays.asList(queryables));
+ this(exec, queryWatcher, Arrays.stream(queryables));
}
public ChainedExecutionQueryRunner(
ExecutorService exec,
QueryWatcher queryWatcher,
Iterable<QueryRunner<T>> queryables
)
+ {
+ this(exec, queryWatcher, StreamSupport.stream(queryables.spliterator(),
false));
+ }
+
+ public ChainedExecutionQueryRunner(
+ ExecutorService exec,
+ QueryWatcher queryWatcher,
+ Stream<QueryRunner<T>> queryables
+ )
{
// listeningDecorator will leave PrioritizedExecutorService unchanged,
// since it already implements ListeningExecutorService
this.exec = MoreExecutors.listeningDecorator(exec);
- this.queryables = Iterables.unmodifiableIterable(queryables);
this.queryWatcher = queryWatcher;
+ this.queryables = queryables;
}
@Override
public Sequence<T> run(final QueryPlus<T> queryPlus, final Map<String,
Object> responseContext)
{
- Query<T> query = queryPlus.getQuery();
+ final Query<T> query = queryPlus.getQuery();
final int priority = QueryContexts.getPriority(query);
- final Ordering ordering = query.getResultOrdering();
+ final Ordering<T> ordering = query.getResultOrdering();
final QueryPlus<T> threadSafeQueryPlus =
queryPlus.withoutThreadUnsafeState();
- return new BaseSequence<T, Iterator<T>>(
+ return new BaseSequence<>(
new BaseSequence.IteratorMaker<T, Iterator<T>>()
{
@Override
public Iterator<T> make()
{
// Make it a List<> to materialize all of the values (so that it
will submit everything to the executor)
- ListenableFuture<List<Iterable<T>>> futures = Futures.allAsList(
- Lists.newArrayList(
- Iterables.transform(
- queryables,
- input -> {
- if (input == null) {
- throw new ISE("Null queryRunner! Looks to be some
segment unmapping action happening");
+ final ListenableFuture<List<Iterable<T>>> futures =
GuavaUtils.allFuturesAsList(
+ queryables.peek(
Review comment:
Yes sounds good
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