com.google.cloud.bigtable.mapreduce.hbasesnapshots.ShuffledTableSnapshotInputFormat Maven / Gradle / Ivy
/*
* Copyright 2021 Google LLC
*
* Licensed 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.google.cloud.bigtable.mapreduce.hbasesnapshots;
import java.io.IOException;
import java.util.Collections;
import java.util.List;
import org.apache.hadoop.hbase.mapreduce.TableSnapshotInputFormat;
import org.apache.hadoop.mapreduce.InputSplit;
import org.apache.hadoop.mapreduce.JobContext;
/**
* A SnapshotInputFormat that randomizes the order of snapshot splits. This is needed for the
* Bigtable import job to spread the load across all of the Bigtable tablet servers and allows
* Bigtable to create initial split quicker.
*/
public class ShuffledTableSnapshotInputFormat extends TableSnapshotInputFormat {
@Override
public List getSplits(JobContext job) throws IOException, InterruptedException {
List splits = super.getSplits(job);
Collections.shuffle(splits);
return splits;
}
}