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A common base library for Apache Accumulo servers.
There is a newer version: 3.0.0
/*
 * 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
 *
 *   https://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.manager.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.server.fs.VolumeManager;
import org.apache.hadoop.conf.Configuration;
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.fs.viewfs.ViewFileSystem;
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, Configuration hadoopConf, VolumeManager fs,
      Path source) throws IOException {
    FileSystem ns = fs.getFileSystemByPath(source);

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

    if (ns instanceof DistributedFileSystem) {
      DistributedFileSystem dfs = (DistributedFileSystem) ns;
      try {
        if (!dfs.recoverLease(source)) {
          log.info("Waiting for file to be closed {}", source);
          return conf.getTimeInMillis(Property.MANAGER_LEASE_RECOVERY_WAITING_PERIOD);
        }
        log.info("Recovered lease on {}", source);
      } catch (FileNotFoundException ex) {
        throw ex;
      } catch (Exception ex) {
        log.warn("Error recovering lease on " + source, ex);
        ns.append(source).close();
        log.info("Recovered lease on {} using append", source);
      }
    } 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;
  }

}