flink-connector-cassandra/src/main/java/org/apache/flink/batch/connectors/cassandra/CassandraOutputFormatBase.java [88:100]:
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        try {
            if (session != null) {
                session.close();
            }
        } catch (Exception e) {
            LOG.error("Error while closing session.", e);
        }
        try {
            if (cluster != null) {
                cluster.close();
            }
        } catch (Exception e) {
            LOG.error("Error while closing cluster.", e);
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flink-connector-cassandra/src/main/java/org/apache/flink/connector/cassandra/source/reader/CassandraSourceReader.java [89:101]:
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        try {
            if (session != null) {
                session.close();
            }
        } catch (Exception e) {
            LOG.error("Error while closing session.", e);
        }
        try {
            if (cluster != null) {
                cluster.close();
            }
        } catch (Exception e) {
            LOG.error("Error while closing cluster.", e);
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