test/compaction-failures/count-file-per-tablet.jshell

/*
 * 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.
 */

import com.google.common.collect.Iterators;
import com.google.common.collect.Streams;
import org.apache.accumulo.core.client.AccumuloClient;
import org.apache.accumulo.core.client.RowIterator;
import org.apache.accumulo.core.data.Range;

// counts files per tablet for a table over time
public class CFPT {

    public static void printPerTabletFileStats(AccumuloClient client, String table, long startTime) throws Exception {
        var tableId = client.tableOperations().tableIdMap().get(table);
        try(var scanner = client.createScanner("accumulo.metadata")) {
            scanner.setRange(new Range(tableId+":", tableId+"<"));
            scanner.fetchColumnFamily("file");
            RowIterator rowIterator = new RowIterator(scanner);
            var stats = Streams.stream(rowIterator).mapToInt(Iterators::size).summaryStatistics();
            long diff = (System.currentTimeMillis() -startTime)/1000;
            System.out.printf("%3d secs min:%d avg:%.2f max:%d\n", diff, stats.getMin(),stats.getAverage(),stats.getMax() );
        }
    }

    public static void printStats(AccumuloClient client, String table, long sleep) throws Exception {
        long startTime = System.currentTimeMillis();
        printPerTabletFileStats(client, table, startTime);

        while(true) {
            Thread.sleep(sleep);
            printPerTabletFileStats(client, table, startTime);
        }
    }
}