Laxmikant Upadhyay created CASSANDRA-14881:
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Summary: Inconsistent behaviour of counter update during cassandra
upgrade 2.1.16 -> 3.11.2
Key: CASSANDRA-14881
URL: https://issues.apache.org/jira/browse/CASSANDRA-14881
Project: Cassandra
Issue Type: Bug
Components: Core
Environment: {code:java}
// code placeholder
{code}
Reporter: Laxmikant Upadhyay
Attachments: CorrectCounterUpdateTrace.txt,
IncorrectCounterUpdateTrace.txt
I have 3 node (A,B,C) 2.1.16 cassandra cluster which i am upgrading to
cassandra 3.11.2.
My current cluster status is node a has been upgrade to 3.11.2, B is down, and
C is on cassandra 2.1.16
when i run counter update using cqlsh it is behaving strange inconsistent way ,
sometimes the update actually applied and sometimes it does not apply at all.
See the below example of cqlsh logged in to node A:
===============Incorrect update : update not applied ========
{code:java}
user@cqlsh:ks> select * from "counterTable";
key | column1 | value
------------------+----------------+-------
key1 | count | 0
user@cqlsh:ks> UPDATE "counterTable" SET value = value + 100 WHERE key = 'key1'
AND column1 = 'count';
user@cqlsh:ks> select * from "counterTable";
key | column1 | value
------------------+----------------+-------
key1 | count | 0{code}
===============Correct update : update applied successfully ========
{code:java}
user@cqlsh> USE ks ;
user@cqlsh:ks> select * from "counterTable";
key | column1 | value
------------------+----------------+-------
key1 | count | -100
user@cqlsh:ks> UPDATE "counterTable" SET value = value + 100 WHERE key = 'key1'
AND column1 = 'count';
user@cqlsh:ks> select * from "counterTable";
key | column1 | value
------------------+----------------+-------
key1 | count | 0{code}
I have attached the output with trace enabled (with actual timestamp) for both
correct and incorrect counter update .
What is the reason of this weird behavior ?
*Note :* When all nodes are successfully upgraded OR when 2 nodes gets upgraded
to 3.11.2 and 3rd non-upgraded node is down then we don't see such issue .
couner update works as expected
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