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From Mauri Moreno Cesare <>
Subject Insert (and delete) data loss?
Date Tue, 30 Jun 2015 12:34:54 GMT
Hi all,
I configured a Cassandra Cluster (3 nodes).

Then I created a KEYSPACE:

cql> CREATE  KEYSPACE  test  WITH REPLICATION = { 'class' : 'SimpleStrategy', 'replication_factor'
: 2 };

and a table:

cql> CREATE TABLE  chiamate_stabili  (chiave  TEXT  PRIMARY  KEY,  valore  BLOB);

I inserted  (synchronous) 10.000 rows (with a Java Client that connects  to one of 3 nodes
during connection phase).

Each row has a "valore" that contains an array of 100K bytes.

When Java Client ends, I wait some seconds and then I try this command inside cql:

cql> SELECT  COUNT(*)  FROM  test.chiamate_stabili  LIMIT  10000;

Result is often 10000 but sometime 6666!

The same 6666 records are found with my Java Client.

Here is Java query code:

for(int i = 1;  i <= 10000; i++) {
  String key = "key-" + i;
  Clause eqClause = QueryBuilder.eq("chiave", key);
  Statement statement ="test", tableName).where(eqClause);

Same behaviour with deletes.

When I try to delete all the records sometimes the table is empty,
but sometimes 3333 records are still present.

I think that something is wrong in my code or (probably) in cluster configuration
but I don't know which kind of tuning or configuration options I can explore.

Any help is very appreciated.
Many thanks in advance.


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