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  1. Core Server
  2. SERVER-9208

database_names blocks while index is being rebuilt on a shard

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    Details

    • Type: Bug
    • Status: Closed
    • Priority: Major - P3
    • Resolution: Works as Designed
    • Affects Version/s: 2.2.3
    • Fix Version/s: None
    • Component/s: Concurrency
    • Labels:
      None
    • Operating System:
      ALL

      Description

      import pymongo
      c = pymongo.Connection('localhost:27119')
      c.database_names()

      c.database_names() doesn't appear to return while a large index is being rebuilt on one of the shards in a sharded cluster.

      We had a server crash due to exceeding the filedescriptor limit. Now, having restarted it with an increased fd limit. The index has taken 30mins to build to 20%. During this time, operations like listing database_names() seem to hang forever

          c.database_names()
        File "/local/home/jblackburn/net/pymongo-2.4.2/pymongo/mongo_client.py", line 1068, in database_names
          self.admin.command("listDatabases")["databases"]]
        File "/local/home/jblackburn/net/pymongo-2.4.2/pymongo/database.py", line 390, in command
          result = self["$cmd"].find_one(command, **extra_opts)
        File "/local/home/jblackburn/net/pymongo-2.4.2/pymongo/collection.py", line 598, in find_one
          for result in self.find(spec_or_id, *args, **kwargs).limit(-1):
        File "/local/home/jblackburn/net/pymongo-2.4.2/pymongo/cursor.py", line 814, in next
          if len(self.__data) or self._refresh():
        File "/local/home/jblackburn/net/pymongo-2.4.2/pymongo/cursor.py", line 763, in _refresh
          self.__uuid_subtype))
        File "/local/home/jblackburn/net/pymongo-2.4.2/pymongo/cursor.py", line 700, in __send_message
          **kwargs)
        File "/local/home/jblackburn/net/pymongo-2.4.2/pymongo/mongo_client.py", line 915, in _send_message_with_response
          return self.__send_and_receive(message, sock_info)
        File "/local/home/jblackburn/net/pymongo-2.4.2/pymongo/mongo_client.py", line 893, in __send_and_receive
          return self.__receive_message_on_socket(1, request_id, sock_info)
        File "/local/home/jblackburn/net/pymongo-2.4.2/pymongo/mongo_client.py", line 878, in __receive_message_on_socket
          header = self.__receive_data_on_socket(16, sock_info)
        File "/local/home/jblackburn/net/pymongo-2.4.2/pymongo/mongo_client.py", line 866, in __receive_data_on_socket
          chunk = sock_info.sock.recv(length)
      KeyboardInterrupt

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            Assignee:
            rassi J Rassi
            Reporter:
            jblackburn James Blackburn
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              Created:
              Updated:
              Resolved: