abhishekagarwal87 commented on a change in pull request #11123:
URL: https://github.com/apache/druid/pull/11123#discussion_r625030507
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File path:
server/src/main/java/org/apache/druid/segment/realtime/appenderator/AppenderatorImpl.java
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@@ -161,6 +164,13 @@
private volatile Throwable persistError;
+ private final boolean isRealTime;
+ // Use next Map to store metadata (File, SegmentId) for a hydrant for batch
appenderator
+ // in order to facilitate the mapping of the QueryableIndex associated with
a given hydrant
+ // at merge time. This is necessary since batch appenderator will not map
the QueryableIndex
+ // at persist time in order to minimize its memory footprint.
+ private final Map<FireHydrant, Pair<File, SegmentId>>
persistedHydrantMetadata = new HashMap<>();
Review comment:
does `FireHydrant` has a `hashCode` implementation? Maybe using
identityHashMap makes more sense here? Also, do we ever need to clear this map?
like when `org.apache.druid.segment.realtime.appenderator.Appenderator#clear`
or `org.apache.druid.segment.realtime.appenderator.Appenderator#drop` is
called.
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