[jira] [Created] (HBASE-8012) Reseek should position to the beginning of file for the first time it is invoked with a KV smaller than the first KV in file

["Raymond Liu (JIRA)" <ji...@apache.org>]

Raymond Liu created HBASE-8012:
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             Summary: Reseek should position to the beginning of file for the first time it is invoked with a KV smaller than the first KV in file
                 Key: HBASE-8012
                 URL: https://issues.apache.org/jira/browse/HBASE-8012
             Project: HBase
          Issue Type: Bug
          Components: regionserver
    Affects Versions: 0.94.5
            Reporter: Raymond Liu
            Assignee: Raymond Liu
            Priority: Minor
             Fix For: 0.98.0


The storeFileScanner's seekAtOrAfter method will position at the beginning of the file when the passed KV is smaller than first KV in file. While for reseekAtOrAfter, I think it should also do the same thing when it is the first time it been seeked. originally, this is workaround by adding a isReseekable property in StoreFileScanner, and is checked upon each enforceSeek(), if it is not seeked before, it will go with seek approaching instead of reseek approaching. While why not make reseekAtOrAfter working correctly for the first time it been reseek (also never been seek before), since the file is never seeked before, so position it at the beginning of the file don't break the idea of "reseek", say never rewind.

It will save the effort for HBASE-8001, with this fixed, it won't need to check isReseekable any more.

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