I've debugged a weird error I'm getting from Solr, which turned out to
be coming from lucene.
For a particular search (it doesn't happen with other searches as far as
I could see), during the facet calculation (DocValues facet), at this
line:
https://github.com/apache/lucene/blob/f965e930673c1f5cb478dc6a8907f5fc4ef7b539/lucene/core/src/java/org/apache/lucene/util/FixedBitSet.java#L297
private int nextSetBitInRange(int start, int upperBound) {
// Depends on the ghost bits being clear!
assert start >= 0 && start < numBits : "index=" + start + ",
numBits=" + numBits;
assert start < upperBound : "index=" + start + ", upperBound=" +
upperBound;
assert upperBound <= numBits : "upperBound=" + upperBound + ",
numBits=" + numBits;
int i = start >> 6;
long word = bits[i] >> start; // skip all the bits to the right of
index
"start" is 46536, "upperBound" is 46492 and "i" is 727:
long word = bits[i] >> start; // skip all the bits to the right of index
the above line throws an exception:
java.lang.ArrayIndexOutOfBoundsException: Index 727 out of bounds for
length 727
I don't know if I can reproduce this error with a few documents and a
simple search, because it is pretty elusive. For example, if I just
reindex, the exception goes away.
When I use another facet calculation algorihtm in Solr (e.g. "enum"),
the error goes away. It's only when docvalues is used.
Could you point me in a direction to maybe better reproduce it with a
specific set of documents, or debug it better?
--Ufuk
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