Zheng Wang created HBASE-27765:
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             Summary: Add biggest cell related info web ui
                 Key: HBASE-27765
                 URL: https://issues.apache.org/jira/browse/HBASE-27765
             Project: HBase
          Issue Type: Improvement
          Components: HFile, UI
            Reporter: Zheng Wang
            Assignee: Zheng Wang


There are some disadvantages to large cell, such as can't be cached or cause 
memory fragmentation, but currently user can't easily to find them out.

My proposal is save len and key of the biggest cell into fileinfo of hfile, and 
shown on web ui, including two places.

1: Add "Len Of Biggest Cell" into main page of regionServer, in here we can 
find out which regions has large cell by sorting.

2: Add "Len Of Biggest Cell" and "Key Of Biggest Cell" into region page, in 
here we can find out the exactly key and the hfile.



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