gianm commented on issue #5931: Support limit for timeseries query (#5894)
URL: https://github.com/apache/incubator-druid/pull/5931#issuecomment-403171386
 
 
   Got one of these too.
   
   ```
   
testBySegmentResultsWithAllFiltersWithExtractionFns[config=v2ParallelCombine, 
runner=rtIndex](io.druid.query.groupby.GroupByQueryRunnerTest)  Time elapsed: 
2.693 sec  <<< ERROR!
   java.lang.OutOfMemoryError: Direct buffer memory
        at java.nio.Bits.reserveMemory(Bits.java:694)
        at java.nio.DirectByteBuffer.<init>(DirectByteBuffer.java:123)
        at java.nio.ByteBuffer.allocateDirect(ByteBuffer.java:311)
        at 
io.druid.query.groupby.GroupByQueryRunnerTest$8.get(GroupByQueryRunnerTest.java:358)
        at 
io.druid.query.groupby.GroupByQueryRunnerTest$8.get(GroupByQueryRunnerTest.java:354)
        at 
io.druid.collections.StupidPool.makeObjectWithHandler(StupidPool.java:112)
        at io.druid.collections.StupidPool.take(StupidPool.java:103)
        at 
io.druid.query.groupby.epinephelinae.GroupByQueryEngineV2.process(GroupByQueryEngineV2.java:125)
        at 
io.druid.query.groupby.strategy.GroupByStrategyV2.process(GroupByStrategyV2.java:354)
        at 
io.druid.query.groupby.GroupByQueryRunnerFactory$GroupByQueryRunner.run(GroupByQueryRunnerFactory.java:108)
        at io.druid.query.BySegmentQueryRunner.run(BySegmentQueryRunner.java:54)
        at 
io.druid.query.FinalizeResultsQueryRunner.run(FinalizeResultsQueryRunner.java:104)
        at 
io.druid.query.ChainedExecutionQueryRunner$1$1.call(ChainedExecutionQueryRunner.java:119)
        at 
io.druid.query.ChainedExecutionQueryRunner$1$1.call(ChainedExecutionQueryRunner.java:114)
        at java.util.concurrent.FutureTask.run(FutureTask.java:266)
        at 
com.google.common.util.concurrent.MoreExecutors$SameThreadExecutorService.execute(MoreExecutors.java:297)
        at 
java.util.concurrent.AbstractExecutorService.submit(AbstractExecutorService.java:134)
        at 
com.google.common.util.concurrent.AbstractListeningExecutorService.submit(AbstractListeningExecutorService.java:58)
        at 
io.druid.query.ChainedExecutionQueryRunner$1.lambda$make$0(ChainedExecutionQueryRunner.java:112)
        at com.google.common.collect.Iterators$8.transform(Iterators.java:794)
        at 
com.google.common.collect.TransformedIterator.next(TransformedIterator.java:48)
        at com.google.common.collect.Iterators.addAll(Iterators.java:357)
        at com.google.common.collect.Lists.newArrayList(Lists.java:147)
        at com.google.common.collect.Lists.newArrayList(Lists.java:129)
   ```

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