yuanlihan edited a comment on issue #9967:
URL: https://github.com/apache/druid/issues/9967#issuecomment-645917973
Hi @liran-funaro, I would like to post feedback about performance
improvement here later.
But currently before performing further performance testing, I suffer from
NPE errors for `timeseries` queries which scan memory data of latest 10
minutes. Note that I applied the patch to branch `0.18.1` and built
successfully except the benchmark module.
```
"timeseries_ds_name_[2020-06-18T09:07:46.039Z/2020-06-18T09:17:46.039Z]@12302"
daemon prio=5 tid=0x152 nid=NA runnable
java.lang.Thread.State: RUNNABLE
at com.yahoo.oak.Slice.getAddress(Slice.java:172)
at com.yahoo.oak.KeyBuffer.getAddress(KeyBuffer.java:9)
at com.yahoo.oak.UnscopedBuffer.getAddress(UnscopedBuffer.java:132)
at
org.apache.druid.segment.incremental.OakIncrementalIndexRow.<init>(OakIncrementalIndexRow.java:52)
at
org.apache.druid.segment.incremental.OakIncrementalIndex$OakFactsHolder.lambda$transformStreamIterator$1(OakIncrementalIndex.java:482)
at
org.apache.druid.segment.incremental.OakIncrementalIndex$OakFactsHolder$$Lambda$389.770801012.apply(Unknown
Source:-1)
at com.google.common.collect.Iterators$8.transform(Iterators.java:794)
at
com.google.common.collect.TransformedIterator.next(TransformedIterator.java:48)
at
org.apache.druid.segment.incremental.IncrementalIndexStorageAdapter$IncrementalIndexCursor.reset(IncrementalIndexStorageAdapter.java:360)
at
org.apache.druid.segment.incremental.IncrementalIndexStorageAdapter$IncrementalIndexCursor.<init>(IncrementalIndexStorageAdapter.java:264)
at
org.apache.druid.segment.incremental.IncrementalIndexStorageAdapter.lambda$makeCursors$0(IncrementalIndexStorageAdapter.java:213)
at
org.apache.druid.segment.incremental.IncrementalIndexStorageAdapter$$Lambda$381.1128483784.apply(Unknown
Source:-1)
at
org.apache.druid.java.util.common.guava.MappingAccumulator.accumulate(MappingAccumulator.java:40)
at
org.apache.druid.java.util.common.guava.BaseSequence.accumulate(BaseSequence.java:44)
at
org.apache.druid.java.util.common.guava.MappedSequence.accumulate(MappedSequence.java:43)
at
org.apache.druid.java.util.common.guava.MappedSequence.accumulate(MappedSequence.java:43)
at
org.apache.druid.java.util.common.guava.FilteredSequence.accumulate(FilteredSequence.java:45)
at
org.apache.druid.java.util.common.guava.WrappingSequence$1.get(WrappingSequence.java:50)
at
org.apache.druid.java.util.common.guava.SequenceWrapper.wrap(SequenceWrapper.java:55)
at
org.apache.druid.java.util.common.guava.WrappingSequence.accumulate(WrappingSequence.java:45)
at
org.apache.druid.java.util.common.guava.Sequence.toList(Sequence.java:85)
at
org.apache.druid.query.ChainedExecutionQueryRunner$1$1.call(ChainedExecutionQueryRunner.java:124)
at
org.apache.druid.query.ChainedExecutionQueryRunner$1$1.call(ChainedExecutionQueryRunner.java:114)
at java.util.concurrent.FutureTask.run(FutureTask.java:266)
at
org.apache.druid.java.util.common.concurrent.DirectExecutorService.execute(DirectExecutorService.java:81)
at
java.util.concurrent.AbstractExecutorService.submit(AbstractExecutorService.java:134)
at
com.google.common.util.concurrent.AbstractListeningExecutorService.submit(AbstractListeningExecutorService.java:58)
at
org.apache.druid.query.ChainedExecutionQueryRunner$1.lambda$make$0(ChainedExecutionQueryRunner.java:112)
at
org.apache.druid.query.ChainedExecutionQueryRunner$1$$Lambda$379.804059870.apply(Unknown
Source:-1)
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)
at
org.apache.druid.query.ChainedExecutionQueryRunner$1.make(ChainedExecutionQueryRunner.java:104)
at
org.apache.druid.java.util.common.guava.BaseSequence.accumulate(BaseSequence.java:39)
at
org.apache.druid.java.util.common.guava.LazySequence.accumulate(LazySequence.java:40)
at
org.apache.druid.java.util.common.guava.WrappingSequence$1.get(WrappingSequence.java:50)
at
org.apache.druid.java.util.common.guava.SequenceWrapper.wrap(SequenceWrapper.java:55)
at
org.apache.druid.java.util.common.guava.WrappingSequence.accumulate(WrappingSequence.java:45)
at
org.apache.druid.java.util.common.guava.LazySequence.accumulate(LazySequence.java:40)
at
org.apache.druid.java.util.common.guava.WrappingSequence$1.get(WrappingSequence.java:50)
at
org.apache.druid.java.util.common.guava.SequenceWrapper.wrap(SequenceWrapper.java:55)
at
org.apache.druid.java.util.common.guava.WrappingSequence.accumulate(WrappingSequence.java:45)
at
org.apache.druid.java.util.common.guava.WrappingSequence$1.get(WrappingSequence.java:50)
at
org.apache.druid.query.CPUTimeMetricQueryRunner$1.wrap(CPUTimeMetricQueryRunner.java:74)
at
org.apache.druid.java.util.common.guava.WrappingSequence.accumulate(WrappingSequence.java:45)
at
org.apache.druid.query.spec.SpecificSegmentQueryRunner$1.accumulate(SpecificSegmentQueryRunner.java:87)
at
org.apache.druid.java.util.common.guava.WrappingSequence$1.get(WrappingSequence.java:50)
at
org.apache.druid.query.spec.SpecificSegmentQueryRunner.doNamed(SpecificSegmentQueryRunner.java:171)
at
org.apache.druid.query.spec.SpecificSegmentQueryRunner.access$100(SpecificSegmentQueryRunner.java:44)
at
org.apache.druid.query.spec.SpecificSegmentQueryRunner$2.wrap(SpecificSegmentQueryRunner.java:153)
at
org.apache.druid.java.util.common.guava.WrappingSequence.accumulate(WrappingSequence.java:45)
at
org.apache.druid.java.util.common.guava.Sequence.toList(Sequence.java:85)
at
org.apache.druid.query.ChainedExecutionQueryRunner$1$1.call(ChainedExecutionQueryRunner.java:124)
at
org.apache.druid.query.ChainedExecutionQueryRunner$1$1.call(ChainedExecutionQueryRunner.java:114)
at java.util.concurrent.FutureTask.run(FutureTask.java:266)
at
org.apache.druid.query.PrioritizedListenableFutureTask.run(PrioritizedExecutorService.java:247)
at
java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
at
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
at java.lang.Thread.run(Thread.java:748)
```
and log
```
2020-06-18T17:32:49,884 ERROR
[timeseries_shopee_sto_apm__tracking_http_live_[2020-06-18T09:23:46.039Z/2020-06-18T09:33:46.039Z]]
org.apache.druid.quer
y.ChainedExecutionQueryRunner - Exception with one of the sequences!
(java.lang.NullPointerException)
```
The NPE error occurs when the `writeBuffer` is null. And I would like to
provide more info to address this issue.
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