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R3704/hadoop-2.3.0-src/hadoop-hdfs-project/hadoop-hdfs/src/main/native/libhdfs/native_mini_dfs.h
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native_mini_dfs.h
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/**
* 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.
*/
#ifndef LIBHDFS_NATIVE_MINI_DFS_H
#define LIBHDFS_NATIVE_MINI_DFS_H
#include <jni.h> /* for jboolean */
struct hdfsBuilder;
struct NativeMiniDfsCluster;
/**
* Represents a configuration to use for creating a Native MiniDFSCluster
*/
struct NativeMiniDfsConf {
/**
* Nonzero if the cluster should be formatted prior to startup.
*/
jboolean doFormat;
/**
* Whether or not to enable webhdfs in MiniDfsCluster
*/
jboolean webhdfsEnabled;
/**
* The http port of the namenode in MiniDfsCluster
*/
jint namenodeHttpPort;
/**
* Nonzero if we should configure short circuit.
*/
jboolean configureShortCircuit;
};
/**
* Create a NativeMiniDfsBuilder
*
* @param conf (inout) The cluster configuration
*
* @return a NativeMiniDfsBuilder, or a NULL pointer on error.
*/
struct NativeMiniDfsCluster* nmdCreate(struct NativeMiniDfsConf *conf);
/**
* Wait until a MiniDFSCluster comes out of safe mode.
*
* @param cl The cluster
*
* @return 0 on success; a non-zero error code if the cluster fails to
* come out of safe mode.
*/
int nmdWaitClusterUp(struct NativeMiniDfsCluster *cl);
/**
* Shut down a NativeMiniDFS cluster
*
* @param cl The cluster
*
* @return 0 on success; a non-zero error code if an exception is
* thrown.
*/
int nmdShutdown(struct NativeMiniDfsCluster *cl);
/**
* Destroy a Native MiniDFSCluster
*
* @param cl The cluster to destroy
*/
void nmdFree(struct NativeMiniDfsCluster* cl);
/**
* Get the port that's in use by the given (non-HA) nativeMiniDfs
*
* @param cl The initialized NativeMiniDfsCluster
*
* @return the port, or a negative error code
*/
int nmdGetNameNodePort(const struct NativeMiniDfsCluster *cl);
/**
* Get the http address that's in use by the given (non-HA) nativeMiniDfs
*
* @param cl The initialized NativeMiniDfsCluster
* @param port Used to capture the http port of the NameNode
* of the NativeMiniDfsCluster
* @param hostName Used to capture the http hostname of the NameNode
* of the NativeMiniDfsCluster
*
* @return 0 on success; a non-zero error code if failing to
* get the information.
*/
int nmdGetNameNodeHttpAddress(const struct NativeMiniDfsCluster *cl,
int *port, const char **hostName);
/**
* Configure the HDFS builder appropriately to connect to this cluster.
*
* @param bld The hdfs builder
*
* @return the port, or a negative error code
*/
int nmdConfigureHdfsBuilder(struct NativeMiniDfsCluster *cl,
struct hdfsBuilder *bld);
#endif
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