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Recently, [our travis ci sometimes fails due to the limited job time](https://travis-ci.org/druid-io/druid/jobs/242596693). I found some unit tests take too long time. Here is the list.
```
Tests …
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MurmurHash3 does a bunch of unnecessary allocations, which means that every HllSketch update there are at least two object allocations. All these objects are very short lived and need to be garbage co…
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Hey,
if I set `druid.emitter` to `nopp` I can still see logging emitter logs :
```
com.metamx.emitter.core.LoggingEmitter ...
```
```
~/imply-1.2.1# cat conf/druid/_common/common.runtime.propertie…
l15k4 updated
6 years ago
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A fully qualified path like `druid.storage.storageDirectory=hdfs://vm-hadoop:9000/druid/segments` causes any ingestion tasks to fail.
How would we persist data into a remote hdfs cluster?
The logs a…
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query like this not work now!
```
{
"queryType": "select",
"dataSource": "ZhuanYeFanyi",
"granularity": "all",
"dimensions": [],
"metrics": [],
"intervals": [
"2015-12…
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As discussed in #3878 and #3886 , we might want a more extendable format for saving XGBoost model.
For now my plan is utilizing the `JSONReader` and `JSONWriter` implemented in `dmlc-core` to add *…
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We currently have a HyperLogLogPlusIsLessThan for the clearspring HyperLogLogPlus sketch object. We should also write one for the datasketches HllSketch.
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We are on druid 0.10 and seeing groupBy v2 failing intermittently with complex columns, we don't see those failures with groupByStrategy=v1.
Stacktrace :
com.yahoo.sketches.SketchesArgumentExcepti…
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https://github.com/DataSketches/memory/blob/5356a8b1db8aaf985acb22766e803f8737de115e/src/main/java/com/yahoo/memory/AccessByteBuffer.java#L32-L80
Why read-only and writable branches are so differen…
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Create a serialiser and aggregator for the new quantiles sketch, KllFloatsSketch, from the Dataksketches library. This will require moving to version 0.11.0 of Datasketches.