hadoop package-info 源码
haddop package-info 代码
文件路径：/hadoop-hdfs-project/hadoop-hdfs-rbf/src/main/java/org/apache/hadoop/hdfs/server/federation/store/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
*
* 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.
*/
/**
* The federation state store tracks persistent values that are shared between
* multiple routers.
* <p>
* Data is stored in data records that inherit from a common class. Data records
* are serialized when written to the data store using a modular serialization
* implementation. The default is profobuf serialization. Data is stored as rows
* of records of the same type with each data member in a record representing a
* column.
* <p>
* The state store uses a modular data storage
* {@link org.apache.hadoop.hdfs.server.federation.store.driver.StateStoreDriver
* StateStoreDriver} to handle querying, updating and deleting data records. The
* data storage driver is initialized and maintained by the {@link
* org.apache.hadoop.hdfs.server.federation.store.StateStoreService
* StateStoreService}. The state store
* supports fetching all records of a type, filtering by column values or
* fetching a single record by its primary key.
* <p>
* The state store contains several API interfaces, one for each data records
* type.
* <ul>
* <li>MembershipStore: state of all Namenodes in the federation.
* Uses the MembershipState record.
* <li>MountTableStore: Mount table mapping paths in the global
* namespace to individual subcluster paths. Uses the MountTable record.
* <li>RouterStore: State of all routers in the federation. Uses the
* RouterState record.
* <li>DisabledNameserviceStore: state of all disabled nameservice in the federation.
* Uses the DisabledNameservice record.
* </ul>
* Each API is defined in a separate interface. The implementations of these
* interfaces are responsible for accessing the {@link
* org.apache.hadoop.hdfs.server.federation.store.driver.StateStoreDriver
* StateStoreDriver} to query, update and delete data records.
*/
@InterfaceAudience.Private
@InterfaceStability.Evolving
package org.apache.hadoop.hdfs.server.federation.store;
import org.apache.hadoop.classification.InterfaceAudience;
import org.apache.hadoop.classification.InterfaceStability;
相关信息
相关文章
hadoop DisabledNameserviceStore 源码
hadoop StateStoreCacheUpdateService 源码
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