Hi,
I have created the sample program to write the contents into HDFS file system.
The file gets created successfully, but unfortunately the file is getting
created in
Local system instead of HDFS system.
Here is the source code of sample program:
int main(int argc, char **argv) {
const char* writePath = "/user/testuser/test1.txt";
const char *tuser = "root";
hdfsFS fs = NULL;
int exists = 0;
fs = hdfsConnectAsUser("default", 0, tuser);
if(fs == NULL ) {
fprintf(stderr, "Oops! Failed to connect to hdfs!\n");
exit(-1);
}
hdfsFile writeFile = hdfsOpenFile(fs, writePath, O_WRONLY|O_CREAT, 0,
0, 0);
if(!writeFile) {
fprintf(stderr, "Failed to open %s for
writing!\n", writePath);
exit(-1);
}
fprintf(stderr, "Opened %s for writing successfully...\n",
writePath);
char* buffer = "Hello, World!";
tSize num_written_bytes = hdfsWrite(fs, writeFile,
(void*)buffer, strlen(buffer)+1);
fprintf(stderr, "Wrote %d bytes\n", num_written_bytes);
fprintf(stderr, "Flushed %s successfully!\n", writePath);
hdfsCloseFile(fs, writeFile);
}
CLASSPATH
/usr/lib/hadoop/lib/activation-1.1.jar:/usr/lib/hadoop/lib/asm-3.2.jar:/usr/lib/hadoop/lib/avro-1.7.3.jar:/usr/lib/hadoop/lib/commons-beanutils-1.7.0.jar:
/usr/lib/hadoop/lib/commons-beanutils-core-1.8.0.jar:/usr/lib/hadoop/lib/commons-cli-1.2.jar:/usr/lib/hadoop/lib/commons-codec-1.4.jar:
/usr/lib/hadoop/lib/commons-collections-3.2.1.jar:/usr/lib/hadoop/lib/commons-configuration-1.6.jar:/usr/lib/hadoop/lib/commons-digester-1.8.jar:
/usr/lib/hadoop/lib/commons-el-1.0.jar:/usr/lib/hadoop/lib/commons-httpclient-3.1.jar:/usr/lib/hadoop/lib/commons-io-2.1.jar:/usr/lib/hadoop/lib/commons-lang-2.5.jar:
/usr/lib/hadoop/lib/commons-logging-1.1.1.jar:/usr/lib/hadoop/lib/commons-math-2.1.jar:/usr/lib/hadoop/lib/commons-net-3.1.jar:/usr/lib/hadoop/lib/guava-11.0.2.jar:
/usr/lib/hadoop/lib/hue-plugins-2.2.0-cdh4.2.0.jar:/usr/lib/hadoop/lib/jackson-core-asl-1.8.8.jar:/usr/lib/hadoop/lib/jackson-jaxrs-1.8.8.jar:
/usr/lib/hadoop/lib/jackson-mapper-asl-1.8.8.jar:/usr/lib/hadoop/lib/jackson-xc-1.8.8.jar:/usr/lib/hadoop/lib/jackson-xc-1.8.8.jar:
/usr/lib/hadoop/lib/jasper-compiler-5.5.23.jar:/usr/lib/hadoop/lib/jasper-runtime-5.5.23.jar:/usr/lib/hadoop/lib/jaxb-api-2.2.2.jar:/usr/lib/hadoop/lib/jaxb-impl-2.2.3-1.jar:
/usr/lib/hadoop/lib/jersey-core-1.8.jar:/usr/lib/hadoop/lib/jersey-json-1.8.jar:/usr/lib/hadoop/lib/jersey-server-1.8.jar:/usr/lib/hadoop/lib/jets3t-0.6.1.jar:/usr/lib/hadoop/lib/jettison-1.1.jar:
/usr/lib/hadoop/lib/jetty-6.1.26.cloudera.2.jar:
/usr/lib/hadoop/lib/jetty-util-6.1.26.cloudera.2.jar:/usr/lib/hadoop/lib/jline-0.9.94.jar:/usr/lib/hadoop/lib/jsch-0.1.42.jar:
/usr/lib/hadoop/lib/jsp-api-2.1.jar:/usr/lib/hadoop/lib/jsr305-1.3.9.jar:/usr/lib/hadoop/lib/junit-4.8.2.jar:/usr/lib/hadoop/lib/kfs-0.3.jar:/usr/lib/hadoop/lib/log4j-1.2.17.jar:
/usr/lib/hadoop/lib/mockito-all-1.8.5.jar:/usr/lib/hadoop/lib/paranamer-2.3.jar:/usr/lib/hadoop/lib/protobuf-java-2.4.0a.jar:/usr/lib/hadoop/lib/servlet-api-2.5.jar:
/usr/lib/hadoop/lib/slf4j-api-1.6.1.jar:/usr/lib/hadoop/lib/slf4j-log4j12-1.6.1.jar:/usr/lib/hadoop/lib/snappy-java-1.0.4.1.jar:/usr/lib/hadoop/lib/stax-api-1.0.1.jar:
/usr/lib/hadoop/lib/xmlenc-0.52.jar:/usr/lib/hadoop/lib/zookeeper-3.4.5-cdh4.2.0.jar:/usr/lib/hadoop/hadoop-annotations.jar:/usr/lib/hadoop/hadoop-auth-2.0.0-cdh4.2.0.jar:
/usr/lib/hadoop/hadoop-auth.jar:/usr/lib/hadoop/hadoop-common-2.0.0-hdfs_site.xml<http://hadoop.6.n7.nabble.com/file/n69039/hdfs_site.xml>core-site.xml<http://hadoop.6.n7.nabble.com/file/n69039/core-site.xml>cdh4.2.0.jar:/usr/lib/hadoop/hadoop-common-2.0.0-cdh4.2.0-tests.jar:/usr/lib/hadoop/hadoop-common.jar:
/usr/lib/hadoop/etc/hadoop/yarn-site.xml:/usr/lib/hadoop/etc/hadoop/core-site.xml:/usr/lib/hadoop/etc/hadoop/hadoop-metrics.properties:/usr/lib/hadoop/etc/hadoop/hdfs-site.xml:
/usr/lib/hadoop/etc/hadoop/mapred-site.xml
Please find attached the hdfs_site.xml and core_site.xml.
Regards,
Dayakar
<?xml version="1.0"?>
<!--
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.
-->
<?xml-stylesheet type="text/xsl" href="configuration.xsl"?>
<configuration>
<property>
<name>dfs.replication</name>
<value>1</value>
</property>
<!-- Immediately exit safemode as soon as one DataNode checks in.
On a multi-node cluster, these configurations must be removed. -->
<property>
<name>dfs.safemode.extension</name>
<value>0</value>
</property>
<property>
<name>dfs.safemode.min.datanodes</name>
<value>1</value>
</property>
<property>
<name>dfs.permissions.enabled</name>
<value>false</value>
</property>
<property>
<name>dfs.permissions</name>
<value>false</value>
</property>
<property>
<name>dfs.safemode.min.datanodes</name>
<value>1</value>
</property>
<property>
<name>dfs.webhdfs.enabled</name>
<value>true</value>
</property>
<property>
<name>hadoop.tmp.dir</name>
<value>/var/lib/hadoop-hdfs/cache/${user.name}</value>
</property>
<property>
<name>dfs.namenode.name.dir</name>
<value>/var/lib/hadoop-hdfs/cache/${user.name}/dfs/name</value>
</property>
<property>
<name>dfs.data.dir</name>
<value>/user/xcomuser</value>
</property>
<property>
<name>dfs.namenode.checkpoint.dir</name>
<value>/var/lib/hadoop-hdfs/cache/${user.name}/dfs/namesecondary</value>
</property>
<property>
<name>dfs.datanode.data.dir</name>
<value>/var/lib/hadoop-hdfs/cache/${user.name}/dfs/data</value>
</property>
</configuration><?xml version="1.0"?>
<!--
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.
-->
<?xml-stylesheet type="text/xsl" href="configuration.xsl"?>
<configuration>
<property>
<name>fs.default.name</name>
<value>hdfs://127.0.0.1:8020</value>
</property>
<!-- OOZIE proxy user setting -->
<property>
<name>hadoop.proxyuser.oozie.hosts</name>
<value>*</value>
</property>
<property>
<name>hadoop.proxyuser.oozie.groups</name>
<value>*</value>
</property>
<!-- HTTPFS proxy user setting -->
<property>
<name>hadoop.proxyuser.httpfs.hosts</name>
<value>*</value>
</property>
<property>
<name>hadoop.proxyuser.httpfs.groups</name>
<value>*</value>
</property>
<!-- Hue proxy user setting -->
<property>
<name>hadoop.proxyuser.hue.hosts</name>
<value>*</value>
</property>
<property>
<name>hadoop.proxyuser.hue.groups</name>
<value>*</value>
</property>
<!-- Enable short-circuit reads for Impala -->
<property>
<name>dfs.client.read.shortcircuit</name>
<value>true</value>
</property>
<property>
<name>dfs.client.read.shortcircuit.skip.checksum</name>
<value>false</value>
</property>
</configuration>
