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https://issues.apache.org/jira/browse/FLINK-4123?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15357262#comment-15357262
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ASF GitHub Bot commented on FLINK-4123:
---------------------------------------
Github user tillrohrmann commented on a diff in the pull request:
https://github.com/apache/flink/pull/2183#discussion_r69153181
--- Diff:
flink-streaming-connectors/flink-connector-cassandra/src/main/java/org/apache/flink/streaming/connectors/cassandra/CassandraTupleWriteAheadSink.java
---
@@ -49,14 +49,8 @@
private final String insertQuery;
--- End diff --
The `CassandraTupleWriteAheadSink` and the `GenericWriteAheadSink` don't
define a `serialVersionUID`.
> CassandraWriteAheadSink can hang on cassandra failure
> -----------------------------------------------------
>
> Key: FLINK-4123
> URL: https://issues.apache.org/jira/browse/FLINK-4123
> Project: Flink
> Issue Type: Bug
> Components: Cassandra Connector
> Affects Versions: 1.1.0
> Reporter: Chesnay Schepler
> Assignee: Chesnay Schepler
> Priority: Blocker
> Fix For: 1.1.0
>
>
> The CassandraWriteAheadSink verifies that all writes send to cassandra have
> been applied by counting how many were sent and how many callbacks were
> activated. Once all writes were sent the sink enters into a loop that is only
> exited once both counts are equal.
> Thus, should cassandra crash after all writes were sent, without having
> acknowledged all writes, the sink will deadlock in the loop.
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