[SPARK-25592] Setting version to 3.0.0-SNAPSHOT

[gatorsmile]

What changes were proposed in this pull request?

This patch is to bump the master branch version to 3.0.0-SNAPSHOT.

How was this patch tested?

N/A

[gatorsmile]

cc @yhuai @rxin @cloud-fan @srowen @dongjoon-hyun

[SparkQA]

Test build #96841 has finished for PR 22606 at commit 2e117b2.

• This patch fails due to an unknown error code, -9.
• This patch merges cleanly.
• This patch adds no public classes.

[SparkQA]

Test build #96842 has finished for PR 22606 at commit a0467da.

• This patch fails due to an unknown error code, -9.
• This patch merges cleanly.
• This patch adds no public classes.

[HyukjinKwon]

retest this please

[SparkQA]

Test build #96847 has finished for PR 22606 at commit a0467da.

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

[srowen]

I'll move anything resolved for 2.5.0 to 3.0.0 in JIRA

[dongjoon-hyun]

+1, LGTM.

[gatorsmile]

Thanks! Merged to master.

[dongjoon-hyun]

Great, @gatorsmile ! Could you update Spark website (versioning-policy.html) accordingly, too?

[gatorsmile]

@dongjoon-hyun Could you help me fix the website?

[dongjoon-hyun]

It's about 3.0.0. So, I guess PMC knows the detail and the future. :)

[srowen]

You mean http://spark.apache.org/versioning-policy.html and the reference to 2.4? I think that's still valid. When 2.4 is released, I'd propose to change that to refer to 3.0 being released .. I dunno .. around Mar 2019?

[gatorsmile]

Yes. Let us wait for the release of 2.4

[dongjoon-hyun]

Thanks, @srowen and @gatorsmile . That sounds good to me.