If you are just trying to get a sense of the data, you could try adding a limit 
clause to limit the amount of results and hopefully beat the timeout.

However, ALLOW FILTERING really means "ALLOW ME TO DESTROY MY APPLICATION AND 
CLUSTER." It means the data model does not support the query and will not scale 
-- in this case, not even on one node. Design a new table to support the query 
with a proper partition key (and any clustering keys).


Sean Durity


-----Original Message-----
From: Dinesh Joshi <djos...@icloud.com.INVALID>
Sent: Wednesday, April 17, 2019 2:39 AM
To: user@cassandra.apache.org
Subject: [EXTERNAL] Re: Caused by: 
com.datastax.driver.core.exceptions.ReadTimeoutException:

More info with detailed explanation: 
https://urldefense.proofpoint.com/v2/url?u=https-3A__www.instaclustr.com_apache-2Dcassandra-2Dscalability-2Dallow-2Dfiltering-2Dpartition-2Dkeys_&d=DwIFAg&c=MtgQEAMQGqekjTjiAhkudQ&r=aC_gxC6z_4f9GLlbWiKzHm1vucZTtVYWDDvyLkh8IaQ&m=HXMAEKpR-N5O0-U5rclUrsVk5QPmSUQYels4VTOVZWI&s=LHl3QGlLsAdszkJ6XK3O2w7_EcSyRyaSFjBgEcK9nfo&e=

Dinesh

> On Apr 16, 2019, at 11:24 PM, Mahesh Daksha <daks...@gmail.com> wrote:
>
> Hi,
>
> how much data you are trying to read in the single query? is it large in size 
> or normal text data.
> Looking at the exception it seems the node is unable to deliver data within 
> stipulated time. I have faced similar issue with the response data in huge in 
> size (some binary data). But it was solved as we spread the data across 
> multiple rows.
>
> Thanks,
> Mahesh Daksha
>
> On Wed, Apr 17, 2019 at 11:42 AM Krishnanand Khambadkone 
> <kkhambadk...@yahoo.com.invalid> wrote:
> Hi,  I have a single instance cassandra server.  I am trying to execute a 
> query with ALLOW FILTERING option.  When I run this same query from cqlsh it 
> runs fine but when I try to execute the query through the java driver it 
> throws this exception.  I have increased all the timeouts in cassandra.yaml 
> file and also included the read timeout option in the SimpleStetement query I 
> am running.  Any idea how I can fix this issue.
> Caused by: com.datastax.driver.core.exceptions.ReadTimeoutException: 
> Cassandra timeout during read query at consistency LOCAL_ONE (1 responses 
> were required but only 0 replica responded)
>
>


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