RE: [EXTERNAL] Re: Python driver concistency problem
This is a stretch, but are you using authentication and/or authorization? In my understanding the queries executed for you to do the authentication and/or authorization are usually done at LOCAL_ONE (or QUORUM for cassandra user), but maybe there is something that is changed in the security setup? Any UDTs or triggers involved in the query? To me, your error seems more like a query being executed “for you” instead of your actual query. Sean Durity From: Vlad Sent: Wednesday, May 22, 2019 6:53 AM To: user@cassandra.apache.org Subject: [EXTERNAL] Re: Python driver concistency problem That's the issue - I do not use consistency ALL. I set QUORUM or ONE but it still performs with ALL. On Wednesday, May 22, 2019 12:42 PM, shalom sagges mailto:shalomsag...@gmail.com>> wrote: In a lot of cases, the issue is with the data model. Can you describe the table? Can you provide the query you use to retrieve the data? What's the load on your cluster? Are there lots of tombstones? You can set the consistency level to ONE, just to check if you get responses. Although normally I would never use ALL unless I run a DDL command. I prefer local_quorum if I want my consistency to be strong while keeping Cassandra's high availability. Regards, The information in this Internet Email is confidential and may be legally privileged. It is intended solely for the addressee. Access to this Email by anyone else is unauthorized. If you are not the intended recipient, any disclosure, copying, distribution or any action taken or omitted to be taken in reliance on it, is prohibited and may be unlawful. When addressed to our clients any opinions or advice contained in this Email are subject to the terms and conditions expressed in any applicable governing The Home Depot terms of business or client engagement letter. The Home Depot disclaims all responsibility and liability for the accuracy and content of this attachment and for any damages or losses arising from any inaccuracies, errors, viruses, e.g., worms, trojan horses, etc., or other items of a destructive nature, which may be contained in this attachment and shall not be liable for direct, indirect, consequential or special damages in connection with this e-mail message or its attachment.
Re: Python driver concistency problem
That's the issue - I do not use consistency ALL. I set QUORUM or ONE but it still performs with ALL. On Wednesday, May 22, 2019 12:42 PM, shalom sagges wrote: In a lot of cases, the issue is with the data model. Can you describe the table? Can you provide the query you use to retrieve the data?What's the load on your cluster?Are there lots of tombstones? You can set the consistency level to ONE, just to check if you get responses. Although normally I would never use ALL unless I run a DDL command. I prefer local_quorum if I want my consistency to be strong while keeping Cassandra's high availability. Regards,
Re: Python driver concistency problem
In a lot of cases, the issue is with the data model. Can you describe the table? Can you provide the query you use to retrieve the data? What's the load on your cluster? Are there lots of tombstones? You can set the consistency level to ONE, just to check if you get responses. Although normally I would never use ALL unless I run a DDL command. I prefer local_quorum if I want my consistency to be strong while keeping Cassandra's high availability. Regards,
Re: Python driver concistency problem
Hi,
I do reads in my own Python code, how cqlsh can affect it?
On Wednesday, May 22, 2019 12:02 PM, Chakravarthi Manepalli
wrote:
Hi Vlad,
Maybe the consistency level has been set manually in CQLSH. Did you try
checking your consistency level and set it back to normal? (Just a thought, Not
sure!!)
On Wed, May 22, 2019 at 2:00 PM Vlad wrote:
Hi,
we have three nodes cluster with KS defined as
CREATE KEYSPACE someks WITH REPLICATION = { 'class' :
'org.apache.cassandra.locator.NetworkTopologyStrategy', 'some-dc': '3' } AND
DURABLE_WRITES = true;
next I read with Pyhton (cassandra-driver 3.11) from Cassandra 3.11.3 and get
error
Error from server: code=1200 [Coordinator node timed out waiting for replica
nodes' responses] message="Operation timed out - received only 2 responses."
info={'received_responses': 2, 'required_responses': 3, 'consistency': 'ALL'}
nor session.default_consistency_level = ConsistencyLevel.QUORUM neither
query = SimpleStatement("SELECT **",
consistency_level=ConsistencyLevel.QUORUM)
rows = session.execute(query)
helps. What it could be?
Thanks in advance.
Re: Python driver concistency problem
Hi Vlad,
Maybe the consistency level has been set manually in CQLSH. Did you try
checking your consistency level and set it back to normal? (Just a thought,
Not sure!!)
On Wed, May 22, 2019 at 2:00 PM Vlad wrote:
> Hi,
>
> we have three nodes cluster with KS defined as
>
> *CREATE KEYSPACE someks WITH REPLICATION = { 'class' :
> 'org.apache.cassandra.locator.NetworkTopologyStrategy', 'some-dc': '3' }
> AND DURABLE_WRITES = true;*
>
> next I read with Pyhton (cassandra-driver 3.11) from Cassandra 3.11.3 and
> get error
>
> *Error from server: code=1200 [Coordinator node timed out waiting for
> replica nodes' responses] message="Operation timed out - received only 2
> responses." info={'received_responses': 2, 'required_responses': 3,
> 'consistency': 'ALL'}*
>
> nor *session.default_consistency_level = ConsistencyLevel.QUORUM* neither
>
> *query = SimpleStatement("SELECT **",
> consistency_level=ConsistencyLevel.QUORUM)rows = session.execute(query)*
>
> helps. What it could be?
>
> Thanks in advance.
>
>
Python driver concistency problem
Hi,
we have three nodes cluster with KS defined as
CREATE KEYSPACE someks WITH REPLICATION = { 'class' :
'org.apache.cassandra.locator.NetworkTopologyStrategy', 'some-dc': '3' } AND
DURABLE_WRITES = true;
next I read with Pyhton (cassandra-driver 3.11) from Cassandra 3.11.3 and get
error
Error from server: code=1200 [Coordinator node timed out waiting for replica
nodes' responses] message="Operation timed out - received only 2 responses."
info={'received_responses': 2, 'required_responses': 3, 'consistency': 'ALL'}
nor session.default_consistency_level = ConsistencyLevel.QUORUM neither
query = SimpleStatement("SELECT **",
consistency_level=ConsistencyLevel.QUORUM)
rows = session.execute(query)
helps. What it could be?
Thanks in advance.
