cozos commented on issue #25899: [SPARK-29089][SQL] Parallelize blocking FileSystem calls in DataSource#checkAndGlobPathIfNecessary URL: https://github.com/apache/spark/pull/25899#issuecomment-536046144 > "fs.s3a.connection.maximum" should be > than "fs.s3a.max.total.tasks" > "fs.s3a.threads.keepalivetime" from 60 to 300 to keep those connections around for longer (avoids that https overhead) Ah right, I haven't considered that we might be bottlenecked by the S3A connection pool. I will update my measurements based on this. @steveloughran Let's say hypothetically that performance keeps improving the more threads we add (say, 500), and it doesn't cause S3 throttling, etc. There's probably an upper limit to how many threads are acceptable to spawn on the driver right? For example what if a user puts their driver on a `t2.nano` EC2 instance.
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