{"action":"created","comment":{"url":"https://api.github.com/repos/apache/spark/pulls/comments/24784064","id":24784064,"diff_hunk":"@@ -144,9 +144,12 @@ private[spark] class PythonRDD(\n                 stream.readFully(update)\n                 accumulator += Collections.singletonList(update)\n               }\n+\n               // Check whether the worker is ready to be re-used.\n-              if (stream.readInt() == SpecialLengths.END_OF_STREAM) {\n-                if (reuse_worker) {\n+              if (reuse_worker) {\n+                // Tt has a high possibility that the ending mark is already 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\"Tt\"","created_at":"2015-02-17T00:05:59Z","updated_at":"2015-02-17T00:05:59Z","html_url":"https://github.com/apache/spark/pull/4601#discussion_r24784064","pull_request_url":"https://api.github.com/repos/apache/spark/pulls/4601","_links":{"self":{"href":"https://api.github.com/repos/apache/spark/pulls/comments/24784064"},"html":{"href":"https://github.com/apache/spark/pull/4601#discussion_r24784064"},"pull_request":{"href":"https://api.github.com/repos/apache/spark/pulls/4601"}}},"pull_request":{"url":"https://api.github.com/repos/apache/spark/pulls/4601","id":29308825,"html_url":"https://github.com/apache/spark/pull/4601","diff_url":"https://github.com/apache/spark/pull/4601.diff","patch_url":"https://github.com/apache/spark/pull/4601.patch","issue_url":"https://api.github.com/repos/apache/spark/issues/4601","number":4601,"state":"open","locked":false,"title":"[SPARK-5363] [PySpark] check ending mark in non-block way","user":{"login":"davies","id":40902,"avatar_url":"https://avatars.githubusercontent.com/u/40902?v=3","gravatar_id":"","url":"https://api.github.com/users/davies","html_url":"https://github.com/davies","followers_url":"https://api.github.com/users/davies/followers","following_url":"https://api.github.com/users/davies/following{/other_user}","gists_url":"https://api.github.com/users/davies/gists{/gist_id}","starred_url":"https://api.github.com/users/davies/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/davies/subscriptions","organizations_url":"https://api.github.com/users/davies/orgs","repos_url":"https://api.github.com/users/davies/repos","events_url":"https://api.github.com/users/davies/events{/privacy}","received_events_url":"https://api.github.com/users/davies/received_events","type":"User","site_admin":false},"body":"There is chance of dead lock that the Python process is waiting for ending mark from JVM, but which is eaten by corrupted stream.\r\n\r\nThis PR checks the ending mark from Python in non-block way, so it will not blocked by Python process.\r\n\r\nThere is a small chance that the ending mark is sent by Python process but not available right now, then Python process will not be used.\r\n\r\ncc @JoshRosen @pwendell 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