leventov commented on a change in pull request #7938: locking in Theta sketch
buffer aggregator
URL: https://github.com/apache/incubator-druid/pull/7938#discussion_r317998273
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File path:
extensions-core/datasketches/src/main/java/org/apache/druid/query/aggregation/datasketches/tuple/ArrayOfDoublesSketchBuildBufferAggregator.java
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@@ -94,7 +93,7 @@ public void aggregate(final ByteBuffer buf, final int
position)
// might might be considered, but it would increase complexity including
relocate() support.
final WritableMemory mem = WritableMemory.wrap(buf,
ByteOrder.LITTLE_ENDIAN);
final WritableMemory region = mem.writableRegion(position,
maxIntermediateSize);
- final Lock lock = stripedLock.getAt(lockIndex(position)).writeLock();
+ final Lock lock =
stripedLock.getAt(StripedLockHelper.lockIndex(position)).writeLock();
lock.lock();
try {
final ArrayOfDoublesUpdatableSketch sketch =
ArrayOfDoublesSketches.wrapUpdatableSketch(region);
Review comment:
If this statement can update the memory, please add a comment like //
ArrayOfDoublesSketches.wrapUpdatableSketch() can update the memory, therefore
it must be inside the critical section.`. Otherwise, please move the statement
outside of the critical section and add a comment like `//
ArrayOfDoublesSketches.wrapUpdatableSketch() cannot update the memory,
therefore it can be outside the critical section.`.
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