HyukjinKwon opened a new pull request #23405: [SPARK-26496][SS][TESTS] Avoid to use Random.nextString in StreamingInnerJoinSuite URL: https://github.com/apache/spark/pull/23405 ## What changes were proposed in this pull request? Similar with https://github.com/apache/spark/pull/21446. Looks random string is not quite safe as a directory name. ```scala scala> val prefix = Random.nextString(10); val dir = new File("/tmp", "del_" + prefix + "-" + UUID.randomUUID.toString); dir.mkdirs() prefix: String = 窽텘⒘駖ⵚ駢⡞Ρ닋 dir: java.io.File = /tmp/del_窽텘⒘駖ⵚ駢⡞Ρ닋-a3f99855-c429-47a0-a108-47bca6905745 res40: Boolean = false // nope, didn't like this one ``` ## How was this patch tested? Unit test was added, and manually.
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