title: Cassandra "truncate" does not empty tables
body: <p>I have encountered this problem recently. When I populated my tables (called event and index) to more than 1 million, and tried to truncate them for new tests, the tables were not empty after the truncation. CQL shows something like</p>
  
  <pre><code>cqlsh&gt; select count(*) from event limit 100000000;
  
   count
  ---------
   2033492
  
  
  cqlsh&gt; truncate event;
  cqlsh&gt; select count(*) from event limit 100000000;
  
   count
  -------
      25
  
  (1 rows)
  
  cqlsh&gt; select count(*) from event limit 100000000;
  
   count
  -------
      27
  
  (1 rows)
  
  cqlsh&gt; select count(*) from event limit 100000000;
  
   count
  -------
      34
  
  (1 rows)
  
  cqlsh&gt; select event_id, dateOf(time_token), unixTimestampOf(time_token), writetime(time_token) from event limit 100000000;
  
   event_id                             | dateOf(time_token)       | unixTimestampOf(time_token) | writetime(time_token)
  --------------------------------------+--------------------------+-----------------------------+-----------------------
   567c4f2b-c86a-4663-a8ec-50f70d183b62 | 2014-07-22 22:29:04-0400 |               1406082544416 |      1406082544416000
   20a2f9e7-cdcb-4c2d-93e7-a646d0910e6b | 2014-07-22 15:12:29-0400 |               1406056349772 |      1406056349774000
   ... ...
   0d983cec-4ba5-4df8-ada8-eb347add57bf | 2014-07-22 22:20:53-0400 |               1406082053926 |      1406082053930000
  
  (34 rows)
  
  cqlsh&gt;
  </code></pre>
  
  <p>After the "truncate" command, the "select count(*)" returned numbers quickly changing, and stabilized at 34. To be sure there is no other program inserting records at the time, I ran a CQL statement showing all records were created on July 22 or 23, which is 4 - 5 days ago.</p>
  
  <p>I tried "truncate" command several times, and the results were the same. </p>
  
  <p>This happened in 2 environments. The first environment is on my laptop where I created 3 Cassandra instances cluster using localhost IPs (127.0.0.2, 127.0.0.3, and 127.0.0.4), while the second environment is 3 node Cassandra cluster, with each node on a separate Linux CentOS 6.5 machine. I am using Cassandra 2.0.6.</p>
  
  <p>Could someone help me to figure out what is going on? Thanks in advance.</p>