spark CustomTaskMetric 源码
spark CustomTaskMetric 代码
文件路径：/sql/catalyst/src/main/java/org/apache/spark/sql/connector/metric/CustomTaskMetric.java
/*
* 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.
*/
package org.apache.spark.sql.connector.metric;
import org.apache.spark.annotation.Evolving;
import org.apache.spark.sql.connector.read.PartitionReader;
/**
* A custom task metric. This is a logical representation of a metric reported by data sources
* at the executor side. During query execution, Spark will collect the task metrics per partition
* by {@link PartitionReader} and update internal metrics based on collected metric values.
* For streaming query, Spark will collect and combine metrics for a final result per micro batch.
* <p>
* The metrics will be gathered during query execution back to the driver and then combined. How
* the task metrics are combined is defined by corresponding {@link CustomMetric} with same metric
* name. The final result will be shown up in the data source scan operator in Spark UI.
* <p>
* There are a few special metric names: "bytesWritten" and "recordsWritten". If the data source
* defines custom metrics with the same names, the metric values will also be updated to
* corresponding task metrics.
*
* @since 3.2.0
*/
@Evolving
public interface CustomTaskMetric {
/**
* Returns the name of custom task metric.
*/
String name();
/**
* Returns the long value of custom task metric.
*/
long value();
}
相关信息
相关文章
0
赞
热门推荐
-
2、 - 优质文章
-
3、 gate.io
-
7、 golang
-
9、 openharmony
-
10、 Vue中input框自动聚焦