Github user JoshRosen commented on the pull request: https://github.com/apache/spark/pull/2944#issuecomment-60834858 It looks like executorIds are assigned by the cluster manager, so in principle they could be arbitrary strings but in practice they seem to not contain special characters that would need special escaping (such as spaces). The application master log viewer (LogPage.scala) doesn't perform any URL-encoding or escaping of executorIds, so I'm not sure that we need to do it here.
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