loquisgon commented on a change in pull request #11123:
URL: https://github.com/apache/druid/pull/11123#discussion_r616078447
##########
File path:
server/src/main/java/org/apache/druid/segment/realtime/appenderator/AppenderatorImpl.java
##########
@@ -849,13 +851,24 @@ private DataSegment mergeAndPush(
// semantics.
() -> dataSegmentPusher.push(
mergedFile,
-
sink.getSegment().withDimensions(IndexMerger.getMergedDimensionsFromQueryableIndexes(indexes,
schema.getDimensionsSpec())),
+ sink.getSegment()
+
.withDimensions(IndexMerger.getMergedDimensionsFromQueryableIndexes(
+ indexes,
+ schema.getDimensionsSpec()
+ )),
useUniquePath
),
exception -> exception instanceof Exception,
5
);
+ // Drop the queriable indexes behind the hydrants... they are not
needed anymore and their
+ // mapped file references
+ // can generate OOMs during merge if enough of them are held back...
+ for (FireHydrant fireHydrant : sink) {
+ fireHydrant.swapSegment(null);
+ }
Review comment:
It turns out that queries can still happen for realtime after hydrants
are merged... I just added code to deal with this case. For realtime ingestion,
memory mappings must remain after merge.
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