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Improve error message when bgen.idx does not exist #7

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Improve error message when bgen.idx does not exist #7

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8 changes: 6 additions & 2 deletions src/main/scala/is/hail/io/IndexBTree.scala
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Original file line number Diff line number Diff line change
Expand Up @@ -52,7 +52,11 @@ object IndexBTree {

class IndexBTree(indexFileName: String, hConf: Configuration) {
val maxDepth = calcDepth()
private val fs = hConf.fileSystem(indexFileName).open(new Path(indexFileName))
private val fs = try {
hConf.fileSystem(indexFileName).open(new Path(indexFileName))
} catch {
case e: Exception => fatal("Could not find a BGEN .idx file at $indexFileName. Try running HailContext.index_begn().", e)
}

def close() = fs.close()

Expand Down Expand Up @@ -119,4 +123,4 @@ class IndexBTree(indexFileName: String, hConf: Configuration) {
else
None
}
}
}