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https://issues.apache.org/jira/browse/HDFS-9522?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15075821#comment-15075821
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John Zhuge commented on HDFS-9522:
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Thanks [~ szetszwo] for the comments. Answers inline.
{quote}
No. DiffReportEntry overrides both methods, so it is ok.
I wouldn't call that "use the field" if the hash of the field is always the
same. One small issue might arise: entries of different types (same values
in other fields) will be placed into the same hash table bucket, which will
degrade hash table performance.
> Cleanup o.a.h.hdfs.protocol.SnapshotDiffReport
> ----------------------------------------------
>
> Key: HDFS-9522
> URL: https://issues.apache.org/jira/browse/HDFS-9522
> Project: Hadoop HDFS
> Issue Type: Improvement
> Reporter: John Zhuge
> Assignee: John Zhuge
> Priority: Minor
> Attachments: HDFS-9522-001.patch
>
> Original Estimate: 24h
> Remaining Estimate: 24h
>
> The current DiffReportEntry is a C-style tagged union-like data structure.
> Recommend subclass hierarchy as in Java idiom.
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