egor-ryashin commented on a change in pull request #6041: Synchronize scheduled
poll() calls in SQLMetadataSegmentManager
URL: https://github.com/apache/incubator-druid/pull/6041#discussion_r296711525
##########
File path:
server/src/main/java/io/druid/metadata/SQLMetadataSegmentManager.java
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@@ -85,20 +85,38 @@
private static final Interner<DataSegment> DATA_SEGMENT_INTERNER =
Interners.newWeakInterner();
private static final EmittingLogger log = new
EmittingLogger(SQLMetadataSegmentManager.class);
- // Use to synchronize start() and stop(). These methods should be
synchronized to prevent from being called at the
- // same time if two different threads are calling them. This might be
possible if a druid coordinator gets and drops
- // leadership repeatedly in quick succession.
- private final Object lock = new Object();
+ /**
+ * Use to synchronize {@link #start()}, {@link #stop()}, {@link #poll()},
and {@link #isStarted()}. These methods
+ * should be synchronized to prevent from being called at the same time if
two different threads are calling them.
+ * This might be possible if a druid coordinator gets and drops leadership
repeatedly in quick succession.
+ */
+ private final ReentrantReadWriteLock readWriteLock = new
ReentrantReadWriteLock();
Review comment:
I wonder if this should be the responsibility of the Lifecycle to
synchronize start/stop of objects ?
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