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Posted to commits@druid.apache.org by GitBox <gi...@apache.org> on 2020/06/14 13:19:05 UTC

[GitHub] [druid] liran-funaro commented on issue #8922: ArrayIndexOutOfBoundsException on historical in class GroupByMergingQueryRunnerV2 when grouping on high-cardinality dimension

liran-funaro commented on issue #8922:
URL: https://github.com/apache/druid/issues/8922#issuecomment-643765636


   This might be an issue with the merge process that uses the `OffheapIncrementalIndex`.
   When the latter is initialized without any metrics (which is what your query seems to do), it fails on `ArrayIndexOutOfBoundsException` due to a bug in `OffheapIncrementalIndex`.
   Checkout PR #10001 which solved this issue. The main purpose of this PR is performance improvements (nearly doubles the ingestion throughput), but it so happens that an added test in this PR discovered this bug and fixed it.


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