[jira] [Commented] (CASSANDRA-14981) Cassandra fires NoHostAvailable exception, but trigger receives update

["Dinesh Joshi (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/CASSANDRA-14981?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16742802#comment-16742802 ] 

Dinesh Joshi commented on CASSANDRA-14981:
------------------------------------------

Hi [~timurtibeyev], thanks for reporting this issue. Could you please post your cassandra config and steps that you took to create the cassandra cluster? Which Docker image are you using?

> Cassandra fires NoHostAvailable exception, but trigger receives update
> ----------------------------------------------------------------------
>
>                 Key: CASSANDRA-14981
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-14981
>             Project: Cassandra
>          Issue Type: Bug
>         Environment: cassandra 3.11.3
>            Reporter: Timur Tibeyev
>            Priority: Major
>         Attachments: Cassandra.png, Kafka consumer.png
>
>
> Cluster
> I have cluster with three nodes, cluster is created via `docker-compose`.
> All nodes in the cluster have `UN` (up normal)  status, checked with `nodetool status`.
>  
> Trigger
> Trigger receives event and produces `Kafka` record.
> All three nodes have same trigger.
>  
> Table
> Here is my CQL query, `users` table replication factor is 2
> Consistency level is one
> ```
> CREATE KEYSPACE mytestdb WITH replication = \{ 'class':'SimpleStrategy', 'replication_factor':2 };
>  USE mytestdb;
> CREATE TABLE IF NOT EXISTS users (
>  id uuid,
>  username text,
>  phone text,
>  lastname text,
>  firstname text,
>  PRIMARY KEY (id)
>  );
> CREATE TRIGGER kafka_trigger ON users USING 'org.company.CassandraTrigger';
> ```
>  
> Problem
> Everything worked fine so I wanted to check edge cases, I intentionally shut down 2 nodes, to check how `Cassandra` and trigger will perform.
> I started to make queries to single working node.
> Some inserts were processed correctly, but for some of them `NoHostAvailable` exception occurred, but trigger received this "failed" insert event and produced normal `Kafka` record
> The problem is - data was not saved to `Cassandra`, but trigger received update.



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