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https://issues.apache.org/jira/browse/LUCENE-10143?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17424037#comment-17424037
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Uwe Schindler commented on LUCENE-10143:
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Hi,
in general I am fine with the PR, my complaints were more about verbosity. So
if we intend to start and rewrite all readPrimitive/writePrimitive in separate
issues, the change is fine.
But the issue here was opened about {{RateLimitedIndexOutput}}. The only code
to change to "fix" this issue is the following change:
https://github.com/apache/lucene/pull/348/files#diff-b3a615b272ca539d83f1b48f760d2fe5fc51a6297f9b2e5b6d78b93e9440a57d
- and we should do this in this issue; nothing more.
The issue is the other DataInputs/Outputs are not all necessarily "slow" (the
name of protected slowWriteBytes() is IMHO really a horrible name, sorry!).
Most of them optimize fairly easy by hotspot and I see no reason to optimize
them. Adding now a call to the protected sowMethods() looks like a horrible API
design to me, especially as IndexOutput/IndexInput are classes often
implemented by 3rd party.
RateLimitedIndexOutput is special, because it does "heavy" (to some extent)
checks on each written primitive or byte unit. By default all methods, also
writeVInt/writeVLong are implemented and convert to a series of singular
writes, each with a check. As the check is not easily optimizable (it depends
on the current file position / number of written bytes), I think the design of
RateLimitedIndexOutput should be rethought: For sure it has to delegate all
methods to be efficient (also writeVInt/writeVLong/...), but just because of
this we would not make all those methods abstract.
About the PR: We should really change the DataInput/Dataoutput API to clarify
that we write Little Endian. A reference to the VarHandle or ByteBuffer as
{{@see}} if a good hint, but we must specifiy how the method must behave - if
it is abstract!
One idea to maybe make it easier is to switch DataInput/DataOutput to be an
interface with default methods. In the base interface (DataOutput), only the
"hard" ones are implemented. But primitive writes aren't. For subclasses who
are happy with default impl, we can add a sub-interface like DefaultDataOutput
that has above slow impls ("implements SlowDataOutputDefaultImpl").
> RateLimitedIndexOutput should delegate writeShort/writeInt/writeLong
> --------------------------------------------------------------------
>
> Key: LUCENE-10143
> URL: https://issues.apache.org/jira/browse/LUCENE-10143
> Project: Lucene - Core
> Issue Type: Improvement
> Reporter: Adrien Grand
> Priority: Minor
> Time Spent: 3h 10m
> Remaining Estimate: 0h
>
> Otherwise merges are not taking advantage of LUCENE-10125.
> cc [~uschindler]
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