RE: Cassandra 2.0.x OOM during startsup - schema version inconsistency after reboot

Hi Alain, Thanks for your reply. We understood that there is a chance that this would be left unresolved, since we are really way behind the official Cassandra releases. Here is what have further found for the OOM issue, which seems to be related to # of gossip message accumulated on a live no

IF EXISTS checks on all nodes?

Hi, If i have inconsistent data on nodes Scenario : I have 2 DCs each with 3 nodes and I have inconsistent data on them node 1,2,3,4,5 have P1,100,A,val1,w1 P1,100,B,val2,w2 node 6 has P1,100,A,val1,w1 P1,100,B,val2,w2 P1,200,C,val3,w3 P1,200,D,val4,w4 col1, col2, col3,col4,col5 in table Primary

Re: IF EXISTS checks on all nodes?

Hello, As far as I know, lightweight transactions only apply to a single partition, so in your case it will only execute on the nodes responsible for that partition. And as a consequence, those nodes will all be in the same state when the transaction ends (If it would apply). Please refer to this

Blocking read repair giving consistent data but not repairing existing data

Hi, We are using dsc 3.0.3 on total of *6 Nodes*,* 2 DC's, 3 Node Each, RF-3* so every node has complete data. Now we are facing a situation on a table with 1 partition key, 2 clustering columns and 4 normal columns. Out of the 6 5 nodes has a single value and Partition key, 2 clustering key for

Re: Low cardinality secondary index behaviour

On Tue, May 10, 2016 at 6:41 AM, Atul Saroha wrote: > I have concern over using secondary index on field with low cardinality. > Lets say I have few billion rows and each row can be classified in 1000 > category. Lets say we have 50 node cluster. > > Now we want to fetch data for a single categor

Re: IF EXISTS checks on all nodes?

Hi, I missed out on some info node 1,2,3 are in DC1 node 4,5,6 are in DC2 and RF is 3 so all data is on all nodes @Carlos : There was only one query. And yes all nodes have same data for col5 only node 6 has P1,100,A,val1,w1 P1,100,B,val2,w2 P1,200,C,val3,w_x P1,200,D,val4,w4 node 1,2,3,4,5 have

Schema format for Cassandra

Hi there, Is there any detailed document about the internal storage format for Cassandra schema? My guess is that Cassandra is using an internal format. If that's true, I am wondering if we've considered using Thrift or Avro format, which might easy the integration between Cassandra and Hadoop. T

client time stamp - force to be continuously increasing?

I'd like to get feedback/opinions on a possible work around for a timestamp + data consistency edge case issue. Context for this question: When using client timestamp (default timestamp), on C* that supports it (v3 protocol), on occasion a record update is lost when executing updates in rapid su

Re: client time stamp - force to be continuously increasing?

to clarify - the currentRecordTs would be saved on a field on the record being persisted From: Jen Smith To: "user@cassandra.apache.org" Sent: Thursday, May 12, 2016 10:32 AM Subject: client time stamp - force to be continuously increasing? I'd like to get feedback/opinions on a po

Re: client time stamp - force to be continuously increasing?

Hi, Among the ideas worth exploring, please note that the DataStax Java driver for Cassandra now includes a modified version of its monotonic timestamp generators that will indeed strive to provide rigorously increasing timestamps, even in the event of a system clock skew (in which case, they woul

Re: client time stamp - force to be continuously increasing?

Thank you - I think this driver solution may address a portion of the problem?   Since this solution is from the driver, is it correct to assume that although this could potentially fix the issue within a single (client) session, it could not fix it for a pool of clients, where client A sent the