steveloughran commented on issue #25899: [SPARK-29089][SQL] Parallelize blocking FileSystem calls in DataSource#checkAndGlobPathIfNecessary URL: https://github.com/apache/spark/pull/25899#issuecomment-559112759 Quick follow up to the "how many connections" discussion. It turns out that a sufficiently large Number of S3 DNS lookups can trigger 503 throttling on DNS and there isn't anything in the AWS library to react to this. The bigger at the connection pool, the more connections you are likely to see on worker start-up, probably workers * S3A URLS * "fs.s3a.connection.maximum" . Don't go overboard. And if you do see the problem, file a HADOOP with stack traces, configs and anything else which could help implementing resilience here. *that doesn't make any difference to this PR, just something to know*
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