Hi Vladimir,
Thank you for the response.
Yes I added all the three node IPs while connecting to the cluster via driver.
Its not failed operation. while the script is running and it takes some time to
read millions of data and during this time , I intentionally put one node down
to see how the script react.
But entire script stops with timeout error. Why?
Kind regards,
Rajesh R
________________________________
From: Vladimir Yudovin [vla...@winguzone.com]
Sent: 24 October 2016 17:04
To: user
Subject: Re: Error creating pool to /IP_ADDRESS33:9042 (Proving Cassandra's NO
SINGLE point of failure)
Probably used Python driver can't restart failed operation with connection to
other node. Do you provide all three IPs to Python driver for connecting?
Best regards, Vladimir Yudovin,
Winguzone<redir.aspx?REF=q9_Pf7rrHEjMR8EIfdHVgiWZ_iV6rbXrIm4Qe63q_x23umczjP3TCAFodHRwczovL3dpbmd1em9uZS5jb20_ZnJvbT1saXN0>
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---- On Mon, 24 Oct 2016 07:48:05 -0400Rajesh Radhakrishnan
<rajesh.radhakrish...@phe.gov.uk> wrote ----
Hi,
I have 3 nodes Cassandra cluster.
Cassandra version : dsc-cassandra-2.1.5
Python Cassandra Driver : 2.5.1
Running the nodes in Red Hat virtual machines.
Node ip info:
Node 1: IP_ADDRESS219
Node 2: IP_ADDRESS229
Node 3: IP_ADDRESS230
(IP_ADDRESS219 is masked for this email which represents something similar
123.321.123.219)
Cassandra.yaml configuration details of node1:
listen_address: IP_ADDRESS219
broadcast_address: commented
rpc_address: IP_ADDRESS219
broadcast_rpc_address : commented
The IP address of the node is ( using the ifconfig command ) IP_ADDRESS219.
While the cluster is up and running , when I put Node 3 (IP_ADDRESS230) down, I
was able to connect to CQLSH from IP_ADDRESS219 and IP_ADDRESS229.
But while I was running a Python script which just reads data from Cassandra
using the cassandra-python-driver, and when the Node 3 stops(while the script
is still running I intentionally stops node3).
Then the script comes to a halt with OperationTimedOut: errors={}, last_host=
IP_ADDRESS219.
However if I run the script when node3 is already down, it runs and reads data.
So during the reading operation if any of the nodes in the cluster goes down
its affects the client operation??? Does anyone has similar situation.
Here we are trying to establish or prove Cassandra's always on (NO single point
of failure). Do you know why this is happening Thank you .
Kind regards,
Rajesh R
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