HDFS-17916: DataStreamer#processDatanodeOrExternalError() fails to return byte arrays to ByteArrayManager (branch-3.5)

[charlesconnell]

Description of PR

Backport of #8466

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[steveloughran]

Two test failures. Could they be related? If not, is there some (test?) change in trunk to cherrypick?

Test Result (2 failures )
org.apache.hadoop.hdfs.TestDFSClientRetries.testLeaseRenewAndDFSOutputStreamDeadLock
org.apache.hadoop.hdfs.TestDFSClientRetries.testLeaseRenewSocketTimeout

[charlesconnell]

@steveloughran I don't think the test failures are related to the changes in this PR. I think that TestDFSClientRetries is flaky because the DFSClientFaultInjector is not reset after each test method. I'm not sure why this issue doesn't present in trunk, maybe the junit 4/5 difference could affect that. I don't see anything targeted to cherry-pick to fix this.