Github user bbossy commented on the issue:
https://github.com/apache/spark/pull/18269
@mallman I'm not sure where this difference in behaviour is coming from.
The following test in `FileIndexSuite` passes:
```
test("mallman's scenario") {
withSQLConf(SQLConf.PARALLEL_PARTITION_DISCOVERY_THRESHOLD.key -> "10")
{
withTempDir { dir =>
for (chunk <- 1.to(27)) {
val f = new File(dir, s"ds=1/h=one/chunk=$chunk/file.parquet")
f.getParentFile.mkdirs()
f.createNewFile()
}
for (chunk <- 1.to(24)) {
val f = new File(dir, s"ds=1/h=two/chunk=$chunk/file.parquet")
f.getParentFile.mkdirs()
f.createNewFile()
}
HiveCatalogMetrics.reset()
assert(HiveCatalogMetrics.METRIC_PARALLEL_LISTING_JOB_COUNT.getCount() == 0)
new InMemoryFileIndex(spark, Seq(new Path(dir.getCanonicalPath)),
Map.empty, None)
assert(HiveCatalogMetrics.METRIC_PARALLEL_LISTING_JOB_COUNT.getCount() == 1)
}
}
}
```
Does it match your scenario?
I'll dig around a bit later to see if I can come up with an explanation.
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