DataSegmentPusherUtil.java

/*
* Licensed to Metamarkets Group Inc. (Metamarkets) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. Metamarkets 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 io.druid.segment.loading;

import com.google.common.base.Joiner;
import io.druid.timeline.DataSegment;
import org.joda.time.format.ISODateTimeFormat;

/**
 */
public class DataSegmentPusherUtil
{
  private static final Joiner JOINER = Joiner.on("/").skipNulls();

  // Note: storage directory structure format = .../dataSource/interval/version/partitionNumber/
  // If above format is ever changed, make sure to change it appropriately in other places
  // e.g. HDFSDataSegmentKiller uses this information to clean the version, interval and dataSource directories
  // on segment deletion if segment being deleted was the only segment
  public static String getStorageDir(DataSegment segment)
  {
    return JOINER.join(
        segment.getDataSource(),
        String.format(
            "%s_%s",
            segment.getInterval().getStart(),
            segment.getInterval().getEnd()
        ),
        segment.getVersion(),
        segment.getShardSpec().getPartitionNum()
    );
  }

  /**
   * Due to https://issues.apache.org/jira/browse/HDFS-13 ":" are not allowed in
   * path names. So we format paths differently for HDFS.
   */
  public static String getHdfsStorageDir(DataSegment segment)
  {
    return JOINER.join(
        segment.getDataSource(),
        String.format(
            "%s_%s",
            segment.getInterval().getStart().toString(ISODateTimeFormat.basicDateTime()),
            segment.getInterval().getEnd().toString(ISODateTimeFormat.basicDateTime())
        ),
        segment.getVersion().replaceAll(":", "_"),
        segment.getShardSpec().getPartitionNum()
    );
  }
}