[SPARK-28543][DOCS][WebUI] Document Spark Jobs page

[planga82]

What changes were proposed in this pull request?

New documentation to explain in detail Web UI Jobs page and link it to monitoring page. New images are included to better explanation

How was this patch tested?

This pull request contains only documentation. I have generated it using "jekyll build" to ensure that it's ok

[dongjoon-hyun]

ok to test

[planga82]

[dongjoon-hyun]

Thank you for your contribution, @planga82 .

[SparkQA]

Test build #108999 has finished for PR 25424 at commit 14fbad7.

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

[srowen]

I'm not against this, but it's mostly repeating what's written on the UI page and in tooltips. How much does this add?

[srowen]

spark -> Spark (and below)

[srowen]

starts -> started

[srowen]

Remove parentheses, or just say "See [job scheduling]"

[srowen]

id -> ID

[srowen]

Remove the "The information we could find is:"

[srowen]

RDDs or DataFrames

[srowen]

Id -> ID

[planga82]

Thanks for the review @srowen , I have fixed all comments
About your first question, sure, it doesn't add too much. When I saw the Jira issue I thought about how to drive it. I think it's a good idea to have documentation about the web UI but I don't know what kind of documentation. Do you think it's better to add some examples? or explain what is a Job... but I think it's not the best place to explain what is a Job. Any idea to improve it?

[SparkQA]

Test build #109058 has finished for PR 25424 at commit 23d9fe7.

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

[srowen]

Yeah I don't know right now. Maybe OK to just get a basic page down in the docs.

[zhengruifeng]

@srowen I had some offline discussion with @gatorsmile , and the expected doc seems to be something like
1, https://www.cloudera.com/documentation/enterprise/5-9-x/topics/operation_spark_applications.html#spark_monitoring
2, https://www.ibm.com/support/knowledgecenter/en/SS3H8V_1.1.0/com.ibm.izoda.v1r1.azka100/topics/azkic_c_webUIs.htm

the first step in my opinion is to add some basic explanation, example and figure for each tab, and we can refine it in the future.

[srowen]

Merged to master