when checking tvx/fdx size mismatch, also include whether the file exists
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Key: LUCENE-1869
URL: https://issues.apache.org/jira/browse/LUCENE-1869
Project: Lucene - Java
Issue Type: Improvement
Components: Index
Reporter: Michael McCandless
Assignee: Michael McCandless
Priority: Trivial
Fix For: 2.9
IndexWriter checks, during flush and during merge, that the size of the index
file for stored fields (*.fdx) and term vectors (*.tvx) matches how many bytes
it has just written.
This originally was added for LUCENE-1282, ie, as a safety to catch the nasty
"off by 1" JRE hotspot bug that would otherwise silently corrupt the index.
However, this check also seems to catch a different case, where the size of the
file is zero. The most recent example is LUCENE-1521. I'd like to improve
the message in the exception to include whether or not the file exists, to help
understand why users are sometimes hitting this exception. My best theory at
this point is something external is removing the file out from under the
IndexWriter.
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