HADOOP-19308: FastSaslClientFactory failing to initialise due to NPE

[Abhey]

Description of PR

• This PR introduces the changes to the constructor of the FastSaslClientFactory to set props to an empty HashMap in case null value is passed.
• Adittionally, This PR adds a try-catch block around the logic where the factoryCache is being populated. This is being done to prevent a bad SaslClientFactory from stopping the instantiation of the FastSaslClientFactory object.

How was this patch tested?

• We applied this patch in our internal fork and were able to resolve the issue reported in the JIRA.

For code changes:

• [x] Does the title or this PR starts with the corresponding JIRA issue id (e.g. 'HADOOP-17799. Your PR title ...')?
• [ ] Object storage: have the integration tests been executed and the endpoint declared according to the connector-specific documentation?
• [ ] If adding new dependencies to the code, are these dependencies licensed in a way that is compatible for inclusion under ASF 2.0?
• [ ] If applicable, have you updated the LICENSE, LICENSE-binary, NOTICE-binary files?

[Abhey]

@apurtell Please review the PR.

[hadoop-yetus]

:broken_heart: -1 overall

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-1 :x:	test4tests	0m 0s		The patch doesn't appear to include any new or modified tests. Please justify why no new tests are needed for this patch. Also please list what manual steps were performed to verify this patch.
			_ branch-3.4.0 Compile Tests _
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			_ Patch Compile Tests _
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+1 :green_heart:	asflicense	1m 4s		The patch does not generate ASF License warnings.
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[shahrs87]

So props can be null, AmqPlainSaslClientFactory should handle the null cases, not us

I agree that fix should be in AmqPlainSaslClientFactory but can we just set the props to empty map if it is set to null? It is complex process to fix it in AmqPlainSaslClientFactory, release qpid and then change the qpid version within our application. @ayushtkn WDYT?

@Abhey I am somewhat hesitant to catch the exception and continue even if loading of some SaslClientFactory fails.

[ayushtkn]

Fundamentally to me that seems wrong only, any implementation is free to have different logic for null & different for empty map & we don't know at the Hadoop layer what all implements that or comment about internal implementations...

Moreover for the ones doing the null check already for them it would be an extra redundant check.

It is complex process to fix it in AmqPlainSaslClientFactory, release qpid and then change the qpid version within our application

you have to patch hadoop, release it & change that version in the client, that goes with any code change in any layer, this can't be a reason to do a change in Hadoop :-)

[github-actions[bot]]

We're closing this stale PR because it has been open for 100 days with no activity. This isn't a judgement on the merit of the PR in any way. It's just a way of keeping the PR queue manageable. If you feel like this was a mistake, or you would like to continue working on it, please feel free to re-open it and ask for a committer to remove the stale tag and review again. Thanks all for your contribution.