[GitHub] leventov opened a new issue #6827: DruidSchema and SystemSchema should avoid creating temprorary collections of the cardinality of all segments

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leventov opened a new issue #6827: DruidSchema and SystemSchema should avoid creating temprorary collections of the cardinality of all segments
URL: https://github.com/apache/incubator-druid/issues/6827
 
 
   It happens in `DruidSchema.getSegmentMetadata()` and `SystemSchema.scan()`. Creating such collections means allocating gigabytes of data, if there are millions of segments in the system. It should be done only if there is really no other way. Avoiding allocations in `DruidSchema.getSegmentMetadata()` and `SystemSchema.scan()` is not very easy without introducing concurrency bugs, but I believe should be possible.

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