aratno commented on code in PR #4118:
URL: https://github.com/apache/cassandra/pull/4118#discussion_r2085674916


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src/java/org/apache/cassandra/db/memtable/ShardedSkipListMemtable.java:
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@@ -351,7 +357,7 @@ static class MemtableShard
         private final ColumnsCollector columnsCollector;
 
         private final StatsCollector statsCollector;
-        private final MutationIdCollector mutationIdCollector;
+        private final MutableCoordinatorLogBoundaries coordinatorLogBoundaries 
= new MutableCoordinatorLogBoundaries();

Review Comment:
   Discussed over Slack - shards are internal to the memtable implementations, 
we don't have any special handling for flushing of a single shard. On flush, a 
new memtable is made available for new writes, existing writes are given time 
to finish up, then are sealed to be flushed. No special handling required for 
sharded memtables and per-disk flushes.



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