HDFS-17109. Null Pointer Exception when running TestBlockManager

[teamconfx]

Description of PR

https://issues.apache.org/jira/browse/HDFS-17109 This PR adds a check for nullity of storageTypeStats. Only updates the InServiceXceiverAverage if the storageTypeStats is not null.

How was this patch tested?

(1) Set dfs.namenode.redundancy.considerLoadByStorageType=true (2) Run org.apache.hadoop.hdfs.server.blockmanagement.TestBlockManager#testOneOfTwoRacksDecommissioned The test passes after the patch.

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?

[hadoop-yetus]

:broken_heart: -1 overall

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+0 :ok:	codespell	0m 1s		codespell was not available.
+0 :ok:	detsecrets	0m 1s		detect-secrets was not available.
+1 :green_heart:	@author	0m 0s		The patch does not contain any @author tags.
-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.
			_ trunk Compile Tests _
+1 :green_heart:	mvninstall	51m 4s		trunk passed
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			_ Patch Compile Tests _
+1 :green_heart:	mvninstall	1m 27s		the patch passed
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-0 :warning:	checkstyle	1m 8s	/results-checkstyle-hadoop-hdfs-project_hadoop-hdfs.txt	hadoop-hdfs-project/hadoop-hdfs: The patch generated 2 new + 24 unchanged - 0 fixed = 26 total (was 24)
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+1 :green_heart:	javadoc	0m 59s		the patch passed with JDK Ubuntu-11.0.20+8-post-Ubuntu-1ubuntu120.04
+1 :green_heart:	javadoc	1m 35s		the patch passed with JDK Private Build-1.8.0_382-8u382-ga-1~20.04.1-b05
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+1 :green_heart:	shadedclient	44m 13s		patch has no errors when building and testing our client artifacts.
			_ Other Tests _
-1 :x:	unit	246m 25s	/patch-unit-hadoop-hdfs-project_hadoop-hdfs.txt	hadoop-hdfs in the patch passed.
+1 :green_heart:	asflicense	0m 46s		The patch does not generate ASF License warnings.
		414m 7s

Reason	Tests
Failed junit tests	hadoop.hdfs.TestRollingUpgrade
	hadoop.hdfs.server.datanode.TestDirectoryScanner

Subsystem	Report/Notes
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GITHUB PR	https://github.com/apache/hadoop/pull/6046
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[teamconfx]

Hi @goiri is there anything else I can do to make this PR merged?

[tomscut]

@teamconfx Please rebase this commit. Thanks.

[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.