我正在尝试获取accumulo数据存储区中存在的功能总数。这是我的示例代码：
package com.hps;
import java.util.Arrays;
import java.util.Map;
import org.geotools.data.DataStoreFinder;
import org.geotools.data.FeatureSource;
import org.geotools.data.FeatureStore;
import org.geotools.data.Query;
import org.geotools.data.Transaction;
import org.geotools.data.simple.SimpleFeatureIterator;
import org.geotools.data.simple.SimpleFeatureSource;
import org.geotools.factory.CommonFactoryFinder;
import org.geotools.factory.Hints;
import org.geotools.filter.text.cql2.CQL;
import org.geotools.filter.text.ecql.ECQL;
import org.geotools.geometry.jts.JTSFactoryFinder;
import org.locationtech.geomesa.accumulo.data.AccumuloAppendFeatureWriter;
import org.locationtech.geomesa.accumulo.data.AccumuloDataStore;
import org.locationtech.geomesa.utils.interop.SimpleFeatureTypes;
import org.opengis.feature.simple.SimpleFeature;
import org.opengis.feature.simple.SimpleFeatureType;
import org.opengis.filter.FilterFactory2;
import org.opengis.filter.sort.SortBy;
import org.opengis.filter.sort.SortOrder;
import com.hps.schemas.Event;
import com.hps.schemas.QueryAdvanced;
import com.hps.schemas.QueryBasic;
import com.vividsolutions.jts.geom.Coordinate;
public class GeomesaClient {
private AccumuloDataStore ds = null;
private AccumuloAppendFeatureWriter fw = null;
private SimpleFeatureSource sfs = null;
private FeatureSource fs = null;
private String tableName = "";
private boolean isFlushed = true;
private long lastFlushTs = 0;
private FeatureStore fst = null;
private SimpleFeatureType sft;
public GeomesaClient(Map<String, String> dsConf) throws Exception {
this.ds = (AccumuloDataStore) DataStoreFinder.getDataStore(dsConf);
this.tableName = dsConf.get("tableName");
sft = createFeatureType();
sft.getUserData().put(SimpleFeatureTypes.DEFAULT_DATE_KEY, "ts");
if(!Arrays.asList(this.ds.getTypeNames()).contains(sft.getTypeName())){
ds.createSchema(sft);
}
this.fw = (AccumuloAppendFeatureWriter) (this.ds.getFeatureWriterAppend(sft.getTypeName(),
Transaction.AUTO_COMMIT));
this.sfs = ds.getFeatureSource(sft.getTypeName());
this.fs = sfs;
this.fst = (FeatureStore) sfs;
}
private SimpleFeatureType createFeatureType() {
try{
StringBuilder simpleFeatureTypeBuilder = new StringBuilder();
simpleFeatureTypeBuilder.append("r:Long:index=full:cardinality=high,");
simpleFeatureTypeBuilder.append("*g:Point:srid=4326,");
simpleFeatureTypeBuilder.append("di:Integer:index=full:cardinality=high,");
simpleFeatureTypeBuilder.append("al:Float:index=join:cardinality=low,");
simpleFeatureTypeBuilder.append("s:Float:index=join:cardinality=low,");
simpleFeatureTypeBuilder.append("b:Float:index=join:cardinality=low,");
simpleFeatureTypeBuilder.append("an:Float:index=join:cardinality=low,");
simpleFeatureTypeBuilder.append("he:Float:index=join:cardinality=low,");
simpleFeatureTypeBuilder.append("ve:Float:index=join:cardinality=low,");
simpleFeatureTypeBuilder.append("t:Float:index=join:cardinality=low,");
simpleFeatureTypeBuilder.append("m:Boolean:index=join:cardinality=low,");
simpleFeatureTypeBuilder.append("i:Boolean:index=join:cardinality=low,");
simpleFeatureTypeBuilder.append("ts:Long:index=join:cardinality=low;");
simpleFeatureTypeBuilder.append("geomesa.indexes.enabled='attr_idx,records,z2'");
return SimpleFeatureTypes.createType(tableName, simpleFeatureTypeBuilder.toString());
}
catch(Exception ex){
ex.printStackTrace();
return null;
}
}
public int getRideCount(Long rideId) throws Exception {
int count = 0;
if(rideId != null)
count = ((Long) (ds.stats().getCount(sft, CQL.toFilter("r=" + rideId), true).get())).intValue();
return count;
}
}
存在的总功能 2636698 ，完成getRideCount()功能执行的时间为 ~10秒。我已经为我的要素类型创建了索引（请参阅函数createFeatureType()），但这似乎没有帮助最小化获取持续时间。我无法理解降低性能的确切问题。如何更快地获得特征集合大小？
这是我的查询计划
[2017-04-26 16:16:31,537] TRACE Explainer: Planning 'aj_v53' r = 31
0 [Thread-5] TRACE org.locationtech.geomesa.index.utils.Explainer - Planning 'aj_v53' r = 31
[2017-04-26 16:16:31,539] TRACE Explainer: Original filter: r = 31
2 [Thread-5] TRACE org.locationtech.geomesa.index.utils.Explainer - Original filter: r = 31
[2017-04-26 16:16:31,540] TRACE Explainer: Hints: density[false] bin[false] stats[false] map-aggregate[false] sampling[none]
3 [Thread-5] TRACE org.locationtech.geomesa.index.utils.Explainer - Hints: density[false] bin[false] stats[false] map-aggregate[false] sampling[none]
[2017-04-26 16:16:31,541] TRACE Explainer: Sort: none
4 [Thread-5] TRACE org.locationtech.geomesa.index.utils.Explainer - Sort: none
[2017-04-26 16:16:31,542] TRACE Explainer: Transforms: g=g
5 [Thread-5] TRACE org.locationtech.geomesa.index.utils.Explainer - Transforms: g=g
[2017-04-26 16:16:31,543] TRACE Explainer: Strategy selection:
6 [Thread-5] TRACE org.locationtech.geomesa.index.utils.Explainer - Strategy selection:
[2017-04-26 16:16:31,565] TRACE Explainer: Query processing took 19ms and produced 1 options
28 [Thread-5] TRACE org.locationtech.geomesa.index.utils.Explainer - Query processing took 19ms and produced 1 options
[2017-04-26 16:16:31,567] TRACE Explainer: Filter plan: FilterPlan[AttributeIndex[r = 31][None]]
30 [Thread-5] TRACE org.locationtech.geomesa.index.utils.Explainer - Filter plan: FilterPlan[AttributeIndex[r = 31][None]]
[2017-04-26 16:16:31,568] TRACE Explainer: Strategy selection took 2ms for 1 options
31 [Thread-5] TRACE org.locationtech.geomesa.index.utils.Explainer - Strategy selection took 2ms for 1 options
[2017-04-26 16:16:31,569] TRACE Explainer: Strategy 1 of 1: AttributeIndex
32 [Thread-5] TRACE org.locationtech.geomesa.index.utils.Explainer - Strategy 1 of 1: AttributeIndex
[2017-04-26 16:16:31,570] TRACE Explainer: Strategy filter: AttributeIndex[r = 31][None]
33 [Thread-5] TRACE org.locationtech.geomesa.index.utils.Explainer - Strategy filter: AttributeIndex[r = 31][None]
[2017-04-26 16:16:31,620] TRACE Explainer: Plan: org.locationtech.geomesa.accumulo.index.BatchScanPlan
83 [Thread-5] TRACE org.locationtech.geomesa.index.utils.Explainer - Plan: org.locationtech.geomesa.accumulo.index.BatchScanPlan
[2017-04-26 16:16:31,621] TRACE Explainer: Table: aj_v53_attr_v4
84 [Thread-5] TRACE org.locationtech.geomesa.index.utils.Explainer - Table: aj_v53_attr_v4
[2017-04-26 16:16:31,622] TRACE Explainer: Deduplicate: false
85 [Thread-5] TRACE org.locationtech.geomesa.index.utils.Explainer - Deduplicate: false
[2017-04-26 16:16:31,622] TRACE Explainer: Column Families (1): List(I)
85 [Thread-5] TRACE org.locationtech.geomesa.index.utils.Explainer - Column Families (1): List(I)
[2017-04-26 16:16:31,624] TRACE Explainer: Ranges (1): [%01;%00;%00;800000000000001f%00;::%01;%00;%00;800000000000001f%01;)
87 [Thread-5] TRACE org.locationtech.geomesa.index.utils.Explainer - Ranges (1): [%01;%00;%00;800000000000001f%00;::%01;%00;%00;800000000000001f%01;)
[2017-04-26 16:16:31,626] TRACE Explainer: Iterators (1):
89 [Thread-5] TRACE org.locationtech.geomesa.index.utils.Explainer - Iterators (1):
[2017-04-26 16:16:31,628] TRACE Explainer: name:filter-transform-iter, priority:25, class:org.locationtech.geomesa.accumulo.iterators.KryoLazyFilterTransformIterator, properties:{sft=*g:Point:srid=4326,ts:Date;geomesa.index.dtg='ts',geomesa.table.sharing='true',geomesa.indices='attr:4:3,records:2:3,z2:3:3',geomesa.table.sharing.prefix='\u0001', tdefs=g=g, index=attr:4, tsft=*g:Point:srid=4326}
91 [Thread-5] TRACE org.locationtech.geomesa.index.utils.Explainer - name:filter-transform-iter, priority:25, class:org.locationtech.geomesa.accumulo.iterators.KryoLazyFilterTransformIterator, properties:{sft=*g:Point:srid=4326,ts:Date;geomesa.index.dtg='ts',geomesa.table.sharing='true',geomesa.indices='attr:4:3,records:2:3,z2:3:3',geomesa.table.sharing.prefix='\u0001', tdefs=g=g, index=attr:4, tsft=*g:Point:srid=4326}
[2017-04-26 16:16:31,629] TRACE Explainer: Plan creation took 49ms
92 [Thread-5] TRACE org.locationtech.geomesa.index.utils.Explainer - Plan creation took 49ms
[2017-04-26 16:16:31,630] TRACE Explainer: Query planning took 137ms
93 [Thread-5] TRACE org.locationtech.geomesa.index.utils.Explainer - Query planning took 137ms
[2017-04-26 16:16:31,644] TRACE Explainer: Planning 'aj_v53' r = 31
107 [Thread-5] TRACE org.locationtech.geomesa.index.utils.Explainer - Planning 'aj_v53' r = 31
[2017-04-26 16:16:31,644] TRACE Explainer: Original filter: r = 31
107 [Thread-5] TRACE org.locationtech.geomesa.index.utils.Explainer - Original filter: r = 31
[2017-04-26 16:16:31,644] TRACE Explainer: Hints: density[false] bin[false] stats[true] map-aggregate[false] sampling[none]
107 [Thread-5] TRACE org.locationtech.geomesa.index.utils.Explainer - Hints: density[false] bin[false] stats[true] map-aggregate[false] sampling[none]
[2017-04-26 16:16:31,644] TRACE Explainer: Sort: none
107 [Thread-5] TRACE org.locationtech.geomesa.index.utils.Explainer - Sort: none
[2017-04-26 16:16:31,644] TRACE Explainer: Transforms: None
107 [Thread-5] TRACE org.locationtech.geomesa.index.utils.Explainer - Transforms: None
[2017-04-26 16:16:31,644] TRACE Explainer: Strategy selection:
107 [Thread-5] TRACE org.locationtech.geomesa.index.utils.Explainer - Strategy selection:
[2017-04-26 16:16:31,646] TRACE Explainer: Query processing took 1ms and produced 1 options
109 [Thread-5] TRACE org.locationtech.geomesa.index.utils.Explainer - Query processing took 1ms and produced 1 options
[2017-04-26 16:16:31,646] TRACE Explainer: Filter plan: FilterPlan[AttributeIndex[r = 31][None]]
109 [Thread-5] TRACE org.locationtech.geomesa.index.utils.Explainer - Filter plan: FilterPlan[AttributeIndex[r = 31][None]]
[2017-04-26 16:16:31,647] TRACE Explainer: Strategy selection took 0ms for 1 options
110 [Thread-5] TRACE org.locationtech.geomesa.index.utils.Explainer - Strategy selection took 0ms for 1 options
[2017-04-26 16:16:31,647] TRACE Explainer: Strategy 1 of 1: AttributeIndex
110 [Thread-5] TRACE org.locationtech.geomesa.index.utils.Explainer - Strategy 1 of 1: AttributeIndex
[2017-04-26 16:16:31,647] TRACE Explainer: Strategy filter: AttributeIndex[r = 31][None]
110 [Thread-5] TRACE org.locationtech.geomesa.index.utils.Explainer - Strategy filter: AttributeIndex[r = 31][None]
[2017-04-26 16:16:31,656] TRACE Explainer: Plan: org.locationtech.geomesa.accumulo.index.BatchScanPlan
119 [Thread-5] TRACE org.locationtech.geomesa.index.utils.Explainer - Plan: org.locationtech.geomesa.accumulo.index.BatchScanPlan
[2017-04-26 16:16:31,656] TRACE Explainer: Table: aj_v53_attr_v4
119 [Thread-5] TRACE org.locationtech.geomesa.index.utils.Explainer - Table: aj_v53_attr_v4
[2017-04-26 16:16:31,656] TRACE Explainer: Deduplicate: false
119 [Thread-5] TRACE org.locationtech.geomesa.index.utils.Explainer - Deduplicate: false
[2017-04-26 16:16:31,656] TRACE Explainer: Column Families (1): List(I)
119 [Thread-5] TRACE org.locationtech.geomesa.index.utils.Explainer - Column Families (1): List(I)
[2017-04-26 16:16:31,657] TRACE Explainer: Ranges (1): [%01;%00;%00;800000000000001f%00;::%01;%00;%00;800000000000001f%01;)
120 [Thread-5] TRACE org.locationtech.geomesa.index.utils.Explainer - Ranges (1): [%01;%00;%00;800000000000001f%00;::%01;%00;%00;800000000000001f%01;)
[2017-04-26 16:16:31,657] TRACE Explainer: Iterators (1):
120 [Thread-5] TRACE org.locationtech.geomesa.index.utils.Explainer - Iterators (1):
[2017-04-26 16:16:31,657] TRACE Explainer: name:stats-iter, priority:30, class:org.locationtech.geomesa.accumulo.iterators.KryoLazyStatsIterator, properties:{sft=*g:Point:srid=4326,ts:Date;geomesa.index.dtg='ts',geomesa.table.sharing='true',geomesa.indices='attr:4:3,records:2:3,z2:3:3',geomesa.table.sharing.prefix='\u0001', dupes=false, index=attr:4, geomesa.stats.string=Count()}
120 [Thread-5] TRACE org.locationtech.geomesa.index.utils.Explainer - name:stats-iter, priority:30, class:org.locationtech.geomesa.accumulo.iterators.KryoLazyStatsIterator, properties:{sft=*g:Point:srid=4326,ts:Date;geomesa.index.dtg='ts',geomesa.table.sharing='true',geomesa.indices='attr:4:3,records:2:3,z2:3:3',geomesa.table.sharing.prefix='\u0001', dupes=false, index=attr:4, geomesa.stats.string=Count()}
[2017-04-26 16:16:31,657] TRACE Explainer: Plan creation took 9ms
120 [Thread-5] TRACE org.locationtech.geomesa.index.utils.Explainer - Plan creation took 9ms
[2017-04-26 16:16:31,658] TRACE Explainer: Query planning took 17ms
121 [Thread-5] TRACE org.locationtech.geomesa.index.utils.Explainer - Query planning took 17ms