protected void instantiateHTable() throws IOException {
        mutator = connection
          .getBufferedMutator(new BufferedMutatorParams(getTableName(connection.getConfiguration()))
            .writeBufferSize(4 * 1024 * 1024));
      }
Some ASCII art time:
<p>
[ . . . ] represents one batch of random longs of length WIDTH

<pre>
               _________________________
              |                  ______ |
              |                 |      ||
            .-+-----------------+-----.||
            | |                 |     |||
first   = [ . . . . . . . . . . . ]   |||
            ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^     |||
            | | | | | | | | | | |     |||
prev    = [ . . . . . . . . . . . ]   |||
            ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^     |||
            | | | | | | | | | | |     |||
current = [ . . . . . . . . . . . ]   |||
                                      |||
...                                   |||
                                      |||
last    = [ . . . . . . . . . . . ]   |||
            ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^_____|||
            |                 |________||
            |___________________________|
</pre>
hbase-it/src/test/java/org/apache/hadoop/hbase/test/IntegrationTestBigLinkedList.java