hadoop Column 源码
haddop Column 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/Column.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;
import org.apache.hadoop.yarn.server.timelineservice.storage.flow.Attribute;
/**
* A Column represents the way to store a fully qualified column in a specific
* table.
*/
public interface Column<T extends BaseTable<T>> {
/**
* Returns column family name(as bytes) associated with this column.
* @return a byte array encoding column family for this column qualifier.
*/
byte[] getColumnFamilyBytes();
/**
* Get byte representation for this column qualifier.
* @return a byte array representing column qualifier.
*/
byte[] getColumnQualifierBytes();
/**
* Returns value converter implementation associated with this column.
* @return a {@link ValueConverter} implementation.
*/
ValueConverter getValueConverter();
/**
* Return attributed combined with aggregations, if any.
* @return an array of Attributes
*/
Attribute[] getCombinedAttrsWithAggr(Attribute... attributes);
/**
* Return true if the cell timestamp needs to be supplemented.
* @return true if the cell timestamp needs to be supplemented
*/
boolean supplementCellTimestamp();
}
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