Manukranth Kolloju created HBASE-8330:
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             Summary: What is the necessity of having a private ThreadLocal in 
FSReaderV2
                 Key: HBASE-8330
                 URL: https://issues.apache.org/jira/browse/HBASE-8330
             Project: HBase
          Issue Type: Brainstorming
          Components: HFile
    Affects Versions: 0.89-fb
            Reporter: Manukranth Kolloju
            Assignee: Manukranth Kolloju
            Priority: Minor
             Fix For: 0.89-fb


I was trying to investigate the scenarios in which we perform a seek back of 24 
bytes(Header size) while we do a HFileBlock read. In the process I stumbled 
upon this issue. In order to avoid the seek back problem, what we do is to 
store the header of the next block in a class named PrefetchedHeader. This 
prefetched header is stored as a private ThreadLocal object in the FSReaderV2 
class. I was wondering why we would be needing a ThreadLocalc when each 
FSReader object has its own PrefetchedHeader object and moreover if its 
private. Can anybody familiar with this part of the code tell me what was the 
design decision that was taken at that time?

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