hadoop package-info 源码
haddop package-info 代码
文件路径：/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/diskbalancer/connectors/package-info.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
* <p/>
* http://www.apache.org/licenses/LICENSE-2.0
* <p/>
* 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.
*/
/**
* Connectors package is a set of logical connectors that connect
* to various data sources to read the hadoop cluster information.
*
* We currently have 3 connectors in this package. They are
*
* DBNameNodeConnector - This uses the connector from the original
* balancer package to connect to a real hadoop cluster.
*
* JsonNodeConnector - This connects to a file and reads the data about a
* cluster. We can generate a cluster json from a real cluster using
* the diskBalancer tool or hand-craft it. There are some sample Json files
* checked in under test/resources/diskBalancer directory.
*
* NullConnector - This is an in-memory connector that is useful in testing.
* we can crate dataNodes on the fly and attach to this connector and
* ask the diskBalancer Cluster to read data from this source.
*/
package org.apache.hadoop.hdfs.server.diskbalancer.connectors;
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