[jira] [Created] (LUCENE-5903) Fix MockDirectoryWrapper double-write logic?

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

Robert Muir created LUCENE-5903:
-----------------------------------

             Summary: Fix MockDirectoryWrapper double-write logic?
                 Key: LUCENE-5903
                 URL: https://issues.apache.org/jira/browse/LUCENE-5903
             Project: Lucene - Core
          Issue Type: Bug
            Reporter: Robert Muir


>From a jenkins failure: 

{quote}
I think its a bug, and this was just exposed by randomization of
commitOnClose in IndexWriterConfig?

we start a CMS merge for _8 segment (consumer creates _8.fdt and
_8.fdx), but this merge doesn't make it into the commit, and we
close() without waiting for merges.
this merge is aborted and indexfiledeleter cleans up _8.fdt and _8.fdx

we start a new IW on the same dir, and the next segment it tries to
create is _8 (how else would it know?) which trips the double-write
logic in createOutput.
This logic currently only checks files that we ever created, and
doesn't check if we ever deleted the file.
We can fix mockdirectorywrapper, but I feel like this could be a real
problem on e.g. windows if the file was busy for both IFD runs.
{quote}




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