hadoop ECBlockGroupsMBean 源码
haddop ECBlockGroupsMBean 代码
文件路径：/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/metrics/ECBlockGroupsMBean.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.hdfs.server.namenode.metrics;
import org.apache.hadoop.classification.InterfaceAudience;
/**
* This interface defines the methods to get status pertaining to blocks of type
* {@link org.apache.hadoop.hdfs.protocol.BlockType#STRIPED} in FSNamesystem
* of a NameNode. It is also used for publishing via JMX.
* <p>
* Aggregated status of all blocks is reported in
* @see FSNamesystemMBean
* Name Node runtime activity statistic info is reported in
* @see org.apache.hadoop.hdfs.server.namenode.metrics.NameNodeMetrics
*
*/
@InterfaceAudience.Private
public interface ECBlockGroupsMBean {
/**
* Return count of erasure coded block groups with low redundancy.
*/
long getLowRedundancyECBlockGroups();
/**
* Return count of erasure coded block groups that are corrupt.
*/
long getCorruptECBlockGroups();
/**
* Return count of erasure coded block groups that are missing.
*/
long getMissingECBlockGroups();
/**
* Return total bytes of erasure coded future block groups.
*/
long getBytesInFutureECBlockGroups();
/**
* Return count of erasure coded blocks that are pending deletion.
*/
long getPendingDeletionECBlocks();
/**
* Return total number of erasure coded block groups.
*/
long getTotalECBlockGroups();
/**
* @return the enabled erasure coding policies separated with comma.
*/
String getEnabledEcPolicies();
}
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