@Override
        public void run() {
          try {
            long row = 0;
            while (!interrupted()) {
              Put p = new Put(Bytes.toBytes(String.format("row%d", row)));
              p.addColumn(Bytes.toBytes(family), Bytes.toBytes("col"), Bytes.toBytes(row));
              table.put(p);
              row++;

              Thread.sleep(LOG_ROLL_PERIOD / 16);
            }
          } catch (Exception e) {
            LOG.warn(e.toString(), e);
          }
        }
Tests that the LogRoller perform the roll with some data in the log
hbase-server/src/test/java/org/apache/hadoop/hbase/regionserver/wal/AbstractTestLogRollPeriod.java