Configure a max limit for lgK values of HLL sketches #15516
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| Original file line number | Diff line number | Diff line change |
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| @@ -0,0 +1,53 @@ | ||
| /* | ||
| * Licensed to the Apache Software Foundation (ASF) under one | ||
| * or more contributor license agreements. See the NOTICE file | ||
| * distributed with this work for additional information | ||
| * regarding copyright ownership. The ASF licenses this file | ||
| * to you under the Apache License, Version 2.0 (the | ||
| * "License"); you may not use this file except in compliance | ||
| * with the License. You may obtain a copy of the License at | ||
| * | ||
| * http://www.apache.org/licenses/LICENSE-2.0 | ||
| * | ||
| * Unless required by applicable law or agreed to in writing, | ||
| * software distributed under the License is distributed on an | ||
| * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY | ||
| * KIND, either express or implied. See the License for the | ||
| * specific language governing permissions and limitations | ||
| * under the License. | ||
| */ | ||
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| package org.apache.druid.query.aggregation.datasketches; | ||
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| import com.fasterxml.jackson.annotation.JsonProperty; | ||
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| import javax.annotation.Nullable; | ||
| import javax.validation.constraints.Max; | ||
| import javax.validation.constraints.Min; | ||
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| /** | ||
| * Contains runtime configurations specific to datasketches extension. | ||
| */ | ||
| public class SketchConfig | ||
| { | ||
| public static final int DEFAULT_HLL_MAX_LG_K = 20; | ||
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| @JsonProperty | ||
| @Min(1) | ||
| @Max(21) | ||
| private int hllMaxLgK = DEFAULT_HLL_MAX_LG_K; | ||
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| public SketchConfig(@Nullable Integer maxLgK) | ||
| { | ||
| this.hllMaxLgK = maxLgK == null ? DEFAULT_HLL_MAX_LG_K : maxLgK; | ||
| } | ||
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| public SketchConfig() | ||
| { | ||
| } | ||
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| public int getHllMaxLgK() | ||
| { | ||
| return hllMaxLgK; | ||
| } | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,33 @@ | ||
| /* | ||
| * Licensed to the Apache Software Foundation (ASF) under one | ||
| * or more contributor license agreements. See the NOTICE file | ||
| * distributed with this work for additional information | ||
| * regarding copyright ownership. The ASF licenses this file | ||
| * to you under the Apache License, Version 2.0 (the | ||
| * "License"); you may not use this file except in compliance | ||
| * with the License. You may obtain a copy of the License at | ||
| * | ||
| * http://www.apache.org/licenses/LICENSE-2.0 | ||
| * | ||
| * Unless required by applicable law or agreed to in writing, | ||
| * software distributed under the License is distributed on an | ||
| * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY | ||
| * KIND, either express or implied. See the License for the | ||
| * specific language governing permissions and limitations | ||
| * under the License. | ||
| */ | ||
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| package org.apache.druid.query.aggregation.datasketches; | ||
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| import com.google.inject.Binder; | ||
| import org.apache.druid.guice.JsonConfigProvider; | ||
| import org.apache.druid.initialization.DruidModule; | ||
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| public class SketchModule implements DruidModule | ||
| { | ||
| @Override | ||
| public void configure(Binder binder) | ||
| { | ||
| JsonConfigProvider.bind(binder, "druid.sketch.config", SketchConfig.class); | ||
| } | ||
| } |
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This should be an ingestion time property only.
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The lgK can be specified during query time as well, wouldn't it need to be limited to avoid running into similar issues?
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I think its more of a ingestion time check only since what we want to avoid is huge rows in the generated segments which increasing the segment sizes which in turn decrease query performance.