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https://issues.apache.org/jira/browse/FLINK-9083?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16691854#comment-16691854
]
ASF GitHub Bot commented on FLINK-9083:
---------------------------------------
azagrebin commented on a change in pull request #6782: [FLINK-9083][Cassandra
Connector] Add async backpressure support to Cassandra Connector
URL: https://github.com/apache/flink/pull/6782#discussion_r234661500
##########
File path:
flink-connectors/flink-connector-cassandra/src/test/java/org/apache/flink/streaming/connectors/cassandra/CassandraSinkBaseTest.java
##########
@@ -204,23 +206,113 @@ public void go() throws Exception {
Thread.sleep(5);
}
- Assert.assertEquals(1, casSinkFunc.getNumOfPendingRecords());
+ Assert.assertEquals(1, casSinkFunc.getAcquiredPermits());
completableFuture.complete(null);
- Assert.assertEquals(0, casSinkFunc.getNumOfPendingRecords());
+ Assert.assertEquals(0, casSinkFunc.getAcquiredPermits());
}
- private static class TestCassandraSink extends
CassandraSinkBase<String, ResultSet> {
+ @Test(timeout = 5000)
+ public void testAcquireOnInvoke() throws Exception {
+ TestCassandraSink casSinkFunc = new TestCassandraSink();
+ casSinkFunc.setMaxConcurrentRequests(1, 5,
TimeUnit.MILLISECONDS);
+
+ casSinkFunc.open(new Configuration());
+
+ CompletableFuture<ResultSet> completableFuture = new
CompletableFuture<>();
+
+
casSinkFunc.setResultSetFuture(ResultSetFutures.fromCompletableFuture(completableFuture));
+
+ Assert.assertEquals(1, casSinkFunc.getAvailablePermits());
+ Assert.assertEquals(0, casSinkFunc.getAcquiredPermits());
+
+ casSinkFunc.invoke("hello");
+
+ Assert.assertEquals(0, casSinkFunc.getAvailablePermits());
+ Assert.assertEquals(1, casSinkFunc.getAcquiredPermits());
+
+ completableFuture.complete(null);
+
+ casSinkFunc.close();
+ }
+
+ @Test(timeout = 5000)
+ public void testReleaseOnSuccess() throws Exception {
Review comment:
Sorry, I meant `testAcquireOnInvoke` is covered by `testReleaseOnSuccess`.
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> Add async backpressure support to Cassandra Connector
> -----------------------------------------------------
>
> Key: FLINK-9083
> URL: https://issues.apache.org/jira/browse/FLINK-9083
> Project: Flink
> Issue Type: Improvement
> Components: Cassandra Connector
> Reporter: Jacob Park
> Assignee: Jacob Park
> Priority: Minor
> Labels: pull-request-available
>
> As the CassandraSinkBase derivatives utilize async writes, they do not block
> the task to introduce any backpressure.
> I am currently using a semaphore to provide backpressure support by blocking
> at a maximum concurrent requests limit like how DataStax's Spark Cassandra
> Connector functions:
> [https://github.com/datastax/spark-cassandra-connector/blob/v2.0.7/spark-cassandra-connector/src/main/scala/com/datastax/spark/connector/writer/AsyncExecutor.scala#L18]
> This improvement has greatly improved the fault-tolerance of our Cassandra
> Sink Connector implementation on Apache Flink in production. I would like to
> contribute this feature back upstream.
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