[jira] [Resolved] (LUCENE-5148) SortedSetDocValues caching / state

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[jira] [Resolved] (LUCENE-5148) SortedSetDocValues caching / state

Sebastian Nagel (Jira)

     [ https://issues.apache.org/jira/browse/LUCENE-5148?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Adrien Grand resolved LUCENE-5148.
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    Resolution: Won't Fix

bq. The patch seems to have a very large amount of changes for such a small thing... is there some reformatting happening?

Yes. In some cases I couldn't use anonymous classes to implement clone properly so I had to use named classes for the codec-specific SortedSet impls so the indentation was smaller by 2 spaces.

bq. If we can't implement this without major changes: then I dont think we should do it.

I wanted to know your opinion first but I came to a similar conclusion. I initially hadn't thought about the issue of cloning too many index inputs... Thanks for your input!
               

> SortedSetDocValues caching / state
> ----------------------------------
>
>                 Key: LUCENE-5148
>                 URL: https://issues.apache.org/jira/browse/LUCENE-5148
>             Project: Lucene - Core
>          Issue Type: Improvement
>            Reporter: Adrien Grand
>            Assignee: Adrien Grand
>            Priority: Minor
>         Attachments: LUCENE-5148.patch
>
>
> I just spent some time digging into a bug which was due to the fact that SORTED_SET doc values are stateful (setDocument/nextOrd) and are cached per thread. So if you try to get two instances from the same field in the same thread, you will actually get the same instance and won't be able to iterate over ords of two documents in parallel.
> This is not necessarily a bug, this behavior can be documented, but I think it would be nice if the API could prevent from such mistakes by storing the state in a separate object or cloning the SortedSetDocValues object in SegmentCoreReaders.getSortedSetDocValues?
> What do you think?

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