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https://issues.apache.org/jira/browse/FLINK-4097?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15342073#comment-15342073
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Andrea Sella commented on FLINK-4097:
-------------------------------------
In the close() of Sink's lifecycle session should be initialized. So, I think
it is a bit hackish to add a null-check to avoid an unexpected behaviour, I
rather prefer a try-catch.
> Cassandra Sink throws NPE on closing if server is not available
> ---------------------------------------------------------------
>
> Key: FLINK-4097
> URL: https://issues.apache.org/jira/browse/FLINK-4097
> Project: Flink
> Issue Type: Bug
> Components: Cassandra Connector, Streaming Connectors
> Affects Versions: 1.1.0
> Reporter: Robert Metzger
>
> {code}
> 11:41:41,515 ERROR
> org.apache.flink.streaming.connectors.cassandra.CassandraSinkBase - Error
> while closing session.
> java.lang.NullPointerException
> at
> org.apache.flink.streaming.connectors.cassandra.CassandraSinkBase.close(CassandraSinkBase.java:84)
> at
> org.apache.flink.api.common.functions.util.FunctionUtils.closeFunction(FunctionUtils.java:45)
> at
> org.apache.flink.streaming.api.operators.AbstractUdfStreamOperator.dispose(AbstractUdfStreamOperator.java:107)
> at
> org.apache.flink.streaming.runtime.tasks.StreamTask.disposeAllOperators(StreamTask.java:370)
> at
> org.apache.flink.streaming.runtime.tasks.StreamTask.invoke(StreamTask.java:304)
> at org.apache.flink.runtime.taskmanager.Task.run(Task.java:588)
> at java.lang.Thread.run(Thread.java:745)
> {code}
> {code}
> 11:41:43,896 ERROR org.apache.flink.runtime.taskmanager.Task
> - Task execution failed.
> com.datastax.driver.core.exceptions.NoHostAvailableException: All host(s)
> tried for query failed (tried: /127.0.0.1:9042
> (com.datastax.driver.core.exceptions.TransportException: [/127.0.0.1] Cannot
> connect))
> at
> com.datastax.driver.core.ControlConnection.reconnectInternal(ControlConnection.java:231)
> at
> com.datastax.driver.core.ControlConnection.connect(ControlConnection.java:77)
> at com.datastax.driver.core.Cluster$Manager.init(Cluster.java:1414)
> at com.datastax.driver.core.Cluster.init(Cluster.java:162)
> at com.datastax.driver.core.Cluster.connectAsync(Cluster.java:333)
> at com.datastax.driver.core.Cluster.connectAsync(Cluster.java:308)
> at com.datastax.driver.core.Cluster.connect(Cluster.java:250)
> at
> org.apache.flink.streaming.connectors.cassandra.CassandraSinkBase.open(CassandraSinkBase.java:67)
> at
> org.apache.flink.streaming.connectors.cassandra.CassandraPojoSink.open(CassandraPojoSink.java:48)
> at
> org.apache.flink.api.common.functions.util.FunctionUtils.openFunction(FunctionUtils.java:38)
> at
> org.apache.flink.streaming.api.operators.AbstractUdfStreamOperator.open(AbstractUdfStreamOperator.java:91)
> at
> org.apache.flink.streaming.runtime.tasks.StreamTask.openAllOperators(StreamTask.java:340)
> at
> org.apache.flink.streaming.runtime.tasks.StreamTask.invoke(StreamTask.java:225)
> at org.apache.flink.runtime.taskmanager.Task.run(Task.java:588)
> at java.lang.Thread.run(Thread.java:745)
> {code}
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