[GitHub] [incubator-druid] leventov opened a new issue #8168: Optimize memory usage by AtomicUpdateGroup

[GitBox <gi...@apache.org>]

leventov opened a new issue #8168: Optimize memory usage by AtomicUpdateGroup
URL: https://github.com/apache/incubator-druid/issues/8168
 
 
   There is a comment inside `AtomicUpdateGroup` talking about the importance of memory usage by this class.
   
   The Javadoc comment for the class also says that this object usually contains just one entry.
   
   If so, the easy optimization is to initialize `chunks = new ArrayList<>(1)` - with the capacity of 1.
   
   A more advanced version would be for `OvershadowableManager` to store `Short2ObjectSortedMap<Object>` maps, where the values may be either `PartitionChunk` directly (if there is one chunk in a group), or `AtomicUpdateGroup` (if there are 2+ chunks in a group). It would complicate ` OvershadowableManager`'s code but would allow avoiding a level of indirection and creation of a lot of `AtomicUpdateGroup`, `ArrayList`, and `Object[]` objects.
   
   FYI @jihoonson 

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