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https://issues.apache.org/jira/browse/LUCENE-5152?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13726847#comment-13726847
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Simon Willnauer commented on LUCENE-5152:
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bq. Should we clone payload bytes in the postings lists too? what about term
dictionaries?
I agree we can be less conservative here and just use the payload and copy it
into a new BytesRef or whatever is needed. I will bring up a new patch.
bq. At some point then BytesRef is useless as a reference class because of a
few bad apples trying to use it as a ByteBuffer. Ideally we would remove code
that abuses BytesRef as a ByteBuffer instead.
agreed again. We just need to make sure that we have asserts in place that
check for that.
bq. I don't mean to pick on your issue Simon, and it doesnt mean I object to
the patch (though I wonder about performance implications), I just see this as
one of many in a larger issue.
no worries. I am really concerned about this since it took me forever to figure
out the problems this caused. I just wanna have an infra in place that catches
those problems. I am more concerned about users that get bitten by this. I
agree we should figure out the bigger problem eventually but lets make sure
that we fix the bad apples first
> Lucene FST is not immutable
> ---------------------------
>
> Key: LUCENE-5152
> URL: https://issues.apache.org/jira/browse/LUCENE-5152
> Project: Lucene - Core
> Issue Type: Bug
> Components: core/FSTs
> Affects Versions: 4.4
> Reporter: Simon Willnauer
> Priority: Blocker
> Fix For: 5.0, 4.5
>
> Attachments: LUCENE-5152.patch, LUCENE-5152.patch
>
>
> a spinnoff from LUCENE-5120 where the analyzing suggester modified a returned
> output from and FST (BytesRef) which caused sideffects in later execution.
> I added an assertion into the FST that checks if a cached root arc is
> modified and in-fact this happens for instance in our MemoryPostingsFormat
> and I bet we find more places. We need to think about how to make this less
> trappy since it can cause bugs that are super hard to find.
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