Github user zsxwing commented on the issue:
https://github.com/apache/spark/pull/17863
This does help. Now the time of this test is about 1 second.
http://spark-tests.appspot.com/test-details?suite_name=org.apache.spark.sql.kafka010.KafkaSourceSuite&test_name=deserialization+of+initial+offset+with+Spark+2.1.0
says it was usually 3-4 seconds.
```
[info] KafkaSourceSuite:
[info] - deserialization of initial offset with Spark 2.1.0 (1 second, 169
milliseconds)
[info] - deserialization of initial offset written by Spark 2.1.0 (967
milliseconds)
[info] - deserialization of initial offset written by future version (234
milliseconds)
```
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