com.ning.metrics.collector.healthchecks.HadoopHealthCheck Maven / Gradle / Ivy
/*
* Copyright 2010-2011 Ning, Inc.
*
* Ning 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 com.ning.metrics.collector.healthchecks;
import com.ning.metrics.serialization.hadoop.FileSystemAccess;
import com.google.inject.Inject;
import com.yammer.metrics.core.HealthCheck;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.fs.FileSystem;
public class HadoopHealthCheck extends HealthCheck
{
private static final String[] HADOOP_PROPERTIES = new String[]{"fs.default.name", "io.serializations", "io.compression.codecs"};
private final FileSystemAccess fsAccess;
@Inject
public HadoopHealthCheck(final FileSystemAccess fsAccess)
{
super(HadoopHealthCheck.class.getName());
this.fsAccess = fsAccess;
}
@Override
public Result check()
{
try {
final FileSystem fileSystem = fsAccess.get(0); // No exponential backoff, fail early
final Configuration fileSystemConf = fileSystem.getConf();
final StringBuilder builder = new StringBuilder();
for (final String prop : HADOOP_PROPERTIES) {
builder.append(String.format("%s: %s, ", prop, fileSystemConf.get(prop)));
}
return Result.healthy(builder.toString());
}
catch (Exception e) {
return Result.healthy("Exception when trying to access Hadoop");
}
}
}