Update BigTable with reverse timestamps, https://github.com/googleapis/google-cloud-go/issues/4087

Main.java

package dev.j1m;

import com.google.cloud.bigtable.hbase.BigtableConfiguration;
import org.apache.hadoop.hbase.Cell;
import org.apache.hadoop.hbase.TableName;
import org.apache.hadoop.hbase.client.*;
import org.apache.hadoop.hbase.util.Bytes;
import java.io.IOException;
import java.nio.ByteBuffer;

public class Main {

    public static final long REVERSE_EPOCH = Long.MAX_VALUE / 1000L;

    private static long reverseTimestamp(long modTs) {
        assert modTs >= 0;
        return REVERSE_EPOCH - modTs;
    }

    private static void doReversedTimestampPut(Table table) throws IOException {
        byte[] key = "key".getBytes();

        long timestamp = System.currentTimeMillis();
        Put put = new Put(key, System.currentTimeMillis());
        put = put.addColumn(Bytes.toBytes("f"), Bytes.toBytes("ts"), reverseTimestamp(timestamp), Bytes.toBytes(timestamp));

        table.put(put);
    }

    public static void main(String[] args) throws IOException {

        Connection connection = BigtableConfiguration.connect("ppp", "iii");
        Table table = connection.getTable(TableName.valueOf("mytable"));
        doReversedTimestampPut(table);

        String rowKey = "key";
        Result result = table.get(new Get(Bytes.toBytes(rowKey)));
        Cell cell = result.getColumnLatestCell("f".getBytes(), "ts".getBytes());

        System.out.println(ByteBuffer.wrap(cell.getValueArray()).getLong());
    }
}