org.apache.accumulo.server.master.recovery.HadoopLogCloser.java Source code

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Here is the source code for org.apache.accumulo.server.master.recovery.HadoopLogCloser.java

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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.
 */
package org.apache.accumulo.server.master.recovery;

import java.io.FileNotFoundException;
import java.io.IOException;

import org.apache.accumulo.core.conf.AccumuloConfiguration;
import org.apache.accumulo.core.conf.Property;
import org.apache.accumulo.core.util.CachedConfiguration;
import org.apache.accumulo.server.fs.ViewFSUtils;
import org.apache.accumulo.server.fs.VolumeManager;
import org.apache.hadoop.fs.FileSystem;
import org.apache.hadoop.fs.LocalFileSystem;
import org.apache.hadoop.fs.Path;
import org.apache.hadoop.fs.RawLocalFileSystem;
import org.apache.hadoop.hdfs.DistributedFileSystem;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

public class HadoopLogCloser implements LogCloser {

    private static final Logger log = LoggerFactory.getLogger(HadoopLogCloser.class);

    @Override
    public long close(AccumuloConfiguration conf, VolumeManager fs, Path source) throws IOException {
        FileSystem ns = fs.getVolumeByPath(source).getFileSystem();

        // if path points to a viewfs path, then resolve to underlying filesystem
        if (ViewFSUtils.isViewFS(ns)) {
            Path newSource = ns.resolvePath(source);
            if (!newSource.equals(source) && newSource.toUri().getScheme() != null) {
                ns = newSource.getFileSystem(CachedConfiguration.getInstance());
                source = newSource;
            }
        }

        if (ns instanceof DistributedFileSystem) {
            DistributedFileSystem dfs = (DistributedFileSystem) ns;
            try {
                if (!dfs.recoverLease(source)) {
                    log.info("Waiting for file to be closed " + source.toString());
                    return conf.getTimeInMillis(Property.MASTER_LEASE_RECOVERY_WAITING_PERIOD);
                }
                log.info("Recovered lease on " + source.toString());
            } catch (FileNotFoundException ex) {
                throw ex;
            } catch (Exception ex) {
                log.warn("Error recovering lease on " + source.toString(), ex);
                ns.append(source).close();
                log.info("Recovered lease on " + source.toString() + " using append");
            }
        } else if (ns instanceof LocalFileSystem || ns instanceof RawLocalFileSystem) {
            // ignore
        } else {
            throw new IllegalStateException("Don't know how to recover a lease for " + ns.getClass().getName());
        }
        return 0;
    }

}