libhdfs hdfswrite namenode ip
/**
* 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.
*/
#include "hdfs.h"
int main(int argc, char **argv) {
if (argc != 4) {
fprintf(stderr, "Usage: hdfs_write <filename> <filesize> <buffersize>
");
exit(-1);
}
hdfsFS fs = hdfsConnect("192.168.1.1", 8020);
if (!fs) {
fprintf(stderr, "Oops! Failed to connect to hdfs!
");
exit(-1);
}
const char* writeFileName = argv[1];
tSize fileTotalSize = strtoul(argv[2], NULL, 10);
tSize bufferSize = strtoul(argv[3], NULL, 10);
hdfsFile writeFile = hdfsOpenFile(fs, writeFileName, O_WRONLY, bufferSize, 0, 0);
if (!writeFile) {
fprintf(stderr, "Failed to open %s for writing!
", writeFileName);
exit(-2);
}
// data to be written to the file
char* buffer = malloc(sizeof(char) * bufferSize);
if(buffer == NULL) {
return -2;
}
int i = 0;
for (i=0; i < bufferSize; ++i) {
buffer[i] = 'a' + (i%26);
}
// write to the file
tSize nrRemaining;
for (nrRemaining = fileTotalSize; nrRemaining > 0; nrRemaining -= bufferSize ) {
int curSize = ( bufferSize < nrRemaining ) ? bufferSize : (int)nrRemaining;
hdfsWrite(fs, writeFile, (void*)buffer, curSize);
}
free(buffer);
hdfsCloseFile(fs, writeFile);
hdfsDisconnect(fs);
return 0;
}
/**
* vim: ts=4: sw=4: et:
*/
HADOOP_HOME JAVA_HOME HADOOP_CONF_DIR CLASSPATH
HADOOP_HOME=/usr/home/hadoop
export HADOOP_HOME
for i in $HADOOP_HOME/*.jar ; do
CLASSPATH=$CLASSPATH:$i
done
for i in $HADOOP_HOME/lib/*.jar ; do
CLASSPATH=$CLASSPATH:$i
done
HADOOP_CONF_DIR=$HADOOP_HOME/conf
CLASSPATH=$CLASSPATH:$HADOOP_CONF_DIR
export HADOOP_CONF_DIR CLASSPATH
CLASSPATH $HADOOP_CONF_DIR
blocksize HADOOP_CONF_DIR
$HADOOP_HOME/src/c++/libhdfs hdfs.c
hdfsFile hdfsOpenFile(hdfsFS fs, const char* path, int flags,
int bufferSize, short replication, tSize blockSize){}
hdfsJniHelper.c :
JNIEnv* getJNIEnv(void){}
:
gcc hdfs_write.c -I${HADOOP_HOME}/src/c++/libhdfs -I${JAVA_HOME}/include -I${JAVA_HOME}/include/linux -L${HADOOP_HOME}/libhdfs -lhdfs -o hdfs_write
hdfs_write <filename> <filesize> <buffersize>