com.ning.metrics.collector.healthchecks.HadoopHealthCheck.java Source code

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Here is the source code for com.ning.metrics.collector.healthchecks.HadoopHealthCheck.java

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/*
 * 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");
        }
    }
}