himanshug commented on a change in pull request #7729:
SeekableStreamIndexTaskRunner: Lazy init of runner.
URL: https://github.com/apache/incubator-druid/pull/7729#discussion_r286661510
##########
File path:
indexing-service/src/main/java/org/apache/druid/indexing/seekablestream/SeekableStreamIndexTask.java
##########
@@ -283,13 +282,20 @@ public boolean withinMinMaxRecordTime(final InputRow row)
@VisibleForTesting
public Appenderator getAppenderator()
{
- return runner.getAppenderator();
+ return getRunner().getAppenderator();
}
@VisibleForTesting
public SeekableStreamIndexTaskRunner<PartitionIdType, SequenceOffsetType>
getRunner()
{
+ if (runner == null) {
+ synchronized (runnerInitLock) {
+ if (runner == null) {
+ runner = createTaskRunner();
+ }
+ }
+ }
Review comment:
and here I thought that with all java8+ fanciness we would have a method in
`AtomicReference<T>.getOrCreate(Supplier<T>)` but it seems this is still the
way for lazy singleton.
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