[BackPort-2.1][SPARK-19319][SparkR]:SparkR Kmeans summary returns error when the cluster size doesn't equal to k

[wangmiao1981]

What changes were proposed in this pull request?

Backport fix of #16666

How was this patch tested?

Backport unit tests

[SparkQA]

Test build #72233 has finished for PR 16761 at commit 5eb2835.

• This patch fails SparkR unit tests.
• This patch merges cleanly.
• This patch adds no public classes.

[SparkQA]

Test build #72262 has finished for PR 16761 at commit 3489899.

• This patch passes all tests.
• This patch merges cleanly.
• This patch adds no public classes.

[felixcheung]

hmm, I wasn't sure to have the parameter changes in 2.1, what do you think?

[wangmiao1981]

If we don't want to change the parameters in 2.1, it is not necessary to port it back. It is because the bug occurs only if you use random mode with specific seed. If we don't provide seed, with default seed, it should be fine. In the future, if there is a case with default seed has problem, we can fix it again.

Thanks!

[felixcheung]

merged to 2.1. Thanks @wangmiao1981 please close this PR.

[felixcheung]

ping @wangmiao1981 please close this PR - backport PR merged to non-master branch isn't closed automatically.

[wangmiao1981]

Thanks! I close it.