Github user bowenli86 commented on the issue:
https://github.com/apache/flink/pull/4150
My Flink job checkpoints to S3, I'm configuring S3AFileSystem shown in
https://ci.apache.org/projects/flink/flink-docs-release-1.3/setup/aws.html#flink-for-hadoop-27.
I doubt if this error is due to S3AFileSystem uses httpcomponents 4.2,
since httpcomponents 4.3.x [has deprecated
SSLSocketFactory](https://hc.apache.org/httpcomponents-client-4.3.x/httpclient/apidocs/org/apache/http/conn/ssl/SSLSocketFactory.html)
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