Github user haoyuan commented on the pull request:
https://github.com/apache/spark/pull/158#issuecomment-38944319
@pwendell regarding the number of subdirectories issue. The number if
configurable: "shuffleManager.conf.get("spark.tachyonStore.subDirectories",
"64").toInt"
Tachyon faces the same issue as local filesystem. There will be pressure if
there are too many files directly in one folder. So, I suggest we leave the
sub-directories logic here. If you prefer a smaller number of folder, e.g.
1,2,4,8, we can change the default value of "spark.tachyonStore.subDirectories"
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