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From "ASF GitHub Bot (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (FLINK-4500) Cassandra sink can lose messages
Date Tue, 07 Nov 2017 07:32:00 GMT

    [ https://issues.apache.org/jira/browse/FLINK-4500?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16241624#comment-16241624

ASF GitHub Bot commented on FLINK-4500:

Github user mcfongtw commented on the issue:

    Hi, @zentol, since there are some conflicts in this branch and a bit out of date from
current master, I will rebase on this branch. However, I need to know if you are planning
to review and merge this PR recently; otherwise, I could do that in later time. 

> Cassandra sink can lose messages
> --------------------------------
>                 Key: FLINK-4500
>                 URL: https://issues.apache.org/jira/browse/FLINK-4500
>             Project: Flink
>          Issue Type: Bug
>          Components: Cassandra Connector
>    Affects Versions: 1.1.0
>            Reporter: Elias Levy
>            Assignee: Michael Fong
> The problem is the same as I pointed out with the Kafka producer sink (FLINK-4027). 
The CassandraTupleSink's send() and CassandraPojoSink's send() both send data asynchronously
to Cassandra and record whether an error occurs via a future callback.  But CassandraSinkBase
does not implement Checkpointed, so it can't stop checkpoint from happening even though the
are Cassandra queries in flight from the checkpoint that may fail.  If they do fail, they
would subsequently not be replayed when the job recovered, and would thus be lost.
> In addition, 
> CassandraSinkBase's close should check whether there is a pending exception and throw
it, rather than silently close.  It should also wait for any pending async queries to complete
and check their status before closing.

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