Github user zhangminglei commented on the issue:
https://github.com/apache/flink/pull/5599
I watched the code and think it is very good. But the travis says
```
Results :
Tests in error:
FlinkKafkaProducer011ITCase.testScaleDownBeforeFirstCheckpoint:333 »
TestTimedOut
Tests run: 42, Failures: 0, Errors: 1, Skipped: 0
18:43:11.642 [INFO]
------------------------------------------------------------------------
18:43:11.642 [INFO] Reactor Summary:
18:43:11.642 [INFO]
18:43:11.642 [INFO] flink-hadoop-fs ....................................
SUCCESS [ 16.959 s]
18:43:11.642 [INFO] flink-mapr-fs ......................................
SUCCESS [ 5.138 s]
18:43:11.642 [INFO] flink-s3-fs-hadoop .................................
SUCCESS [ 30.410 s]
18:43:11.642 [INFO] flink-s3-fs-presto .................................
SUCCESS [ 31.165 s]
18:43:11.643 [INFO] flink-hadoop-compatibility .........................
SUCCESS [01:05 min]
18:43:11.643 [INFO] flink-avro .........................................
SUCCESS [ 23.859 s]
18:43:11.643 [INFO] flink-jdbc .........................................
SUCCESS [ 8.501 s]
18:43:11.643 [INFO] flink-hbase ........................................
SUCCESS [ 46.495 s]
18:43:11.643 [INFO] flink-hcatalog .....................................
SUCCESS [ 0.871 s]
18:43:11.643 [INFO] flink-connector-kafka-base .........................
SUCCESS [ 7.658 s]
18:43:11.643 [INFO] flink-connector-kafka-0.8 ..........................
SUCCESS [02:32 min]
18:43:11.643 [INFO] flink-connector-kafka-0.9 ..........................
SUCCESS [02:49 min]
18:43:11.643 [INFO] flink-connector-kafka-0.10 .........................
SUCCESS [02:49 min]
18:43:11.643 [INFO] flink-connector-kafka-0.11 .........................
FAILURE [10:49 min]
18:43:11.643 [INFO] flink-connector-elasticsearch-base .................
SKIPPED
18:43:11.643 [INFO] flink-connector-elasticsearch ......................
SKIPPED
18:43:11.643 [INFO] flink-connector-elasticsearch2 .....................
SKIPPED
18:43:11.643 [INFO] flink-connector-elasticsearch5 .....................
SKIPPED
18:43:11.643 [INFO] flink-connector-rabbitmq ...........................
SKIPPED
18:43:11.643 [INFO] flink-connector-twitter ............................
SKIPPED
18:43:11.643 [INFO] flink-connector-nifi ...............................
SKIPPED
18:43:11.643 [INFO] flink-connector-cassandra ..........................
SKIPPED
18:43:11.643 [INFO] flink-connector-filesystem .........................
SKIPPED
18:43:11.643 [INFO] flink-connector-kinesis ............................
SKIPPED
18:43:11.643 [INFO] flink-connector-wikiedits ..........................
SKIPPED
18:43:11.643 [INFO]
------------------------------------------------------------------------
18:43:11.643 [INFO] BUILD FAILURE
18:43:11.643 [INFO]
------------------------------------------------------------------------
18:43:11.643 [INFO] Total time: 23:00 min
18:43:11.643 [INFO] Finished at: 2018-02-28T18:43:11+00:00
18:43:12.101 [INFO] Final Memory: 117M/746M
```
---
