[jira] [Created] (HBASE-13373) Squash HFileReaderV3 together with HFileReaderV2 and AbstractHFileReader; ditto for Scanners and BlockReader, etc.

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

stack created HBASE-13373:
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             Summary: Squash HFileReaderV3 together with HFileReaderV2 and AbstractHFileReader; ditto for Scanners and BlockReader, etc.
                 Key: HBASE-13373
                 URL: https://issues.apache.org/jira/browse/HBASE-13373
             Project: HBase
          Issue Type: Task
            Reporter: stack


Profiling I actually ran into case where complaint that could not inline because:

MaxInlineLevel maximum number of nested calls that are inlined 9 intx

i.e. method was more than 9 levels deep.

The HFileReaderV? with Abstracts is not needed anymore now we are into the clear with V3 enabled since hbase 1.0.0; we can have just an Interface and an implementation.  If we need to support a new hfile type, can hopefully do it in a backward compatible way now we have Cell Interface, etc.

Squashing all this stuff together actually makes it easier figuring what is going on when reading code. I can also get rid of a bunch of duplication too.

Attached is a WIP. Doesn't fully compile yet but you get the idea.

I'll keep on unless objection. Will try it against data written with old classes as soon as I have something working. I don't believe we write classnames into our data.







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