hadoop RowKeyPrefix 源码
haddop RowKeyPrefix 代码
文件路径：/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-timelineservice-hbase/hadoop-yarn-server-timelineservice-hbase-common/src/main/java/org/apache/hadoop/yarn/server/timelineservice/storage/common/RowKeyPrefix.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.hadoop.yarn.server.timelineservice.storage.common;
/**
* In queries where a single result is needed, an exact rowkey can be used
* through the corresponding rowkey#getRowKey() method. For queries that need to
* scan over a range of rowkeys, a partial (the initial part) of rowkeys are
* used. Classes implementing RowKeyPrefix indicate that they are the initial
* part of rowkeys, with different constructors with fewer number of argument to
* form a partial rowkey, a prefix.
*
* @param <R> indicating the type of rowkey that a particular implementation is
* a prefix for.
*/
public interface RowKeyPrefix<R> {
/**
* Create a row key prefix, meaning a partial rowkey that can be used in range
* scans. Which fields are included in the prefix will depend on the
* constructor of the specific instance that was used. Output depends on which
* constructor was used.
* @return a prefix of the following form {@code fist!second!...!last!}
*/
byte[] getRowKeyPrefix();
}
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