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POMongos distribute too much query to one MongoD
 

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  1. POMongos distribute too much query to one MongoD
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    <p>We have a mongodb with 2 shardings, each of the shardings has those servers:</p> <ol> <li>Shard 1: Master, running MongoD and Config server</li> <li>Shard 1-s1: Slave, running MongoD and MongoS server</li> <li>Shard 1-s2: Slave, running MongoD and MongoS and Arbiter server</li> <li>Shard 2: Master, running MongoD and Config Server</li> <li>Shard 2-s1: Slave, running MongoD and Config and MongoS server</li> <li>Shard 2-s2: Slave, running MongoD and MongoS and Arbiter server</li> </ol> <p>But the mongodb allways failed in recent days, after days of search, i find out that the MongoD runs at Shard 1(Master) always going down after reviced too many connections, other MongoD don't have this problem.</p> <p>When the S1Master's MongoD running with too many connections for about 2 hours, the 4 Mongos Server will shut down one by one. Here is the Mongos's error log(10.81.4.72:7100 runs MongoD):</p> <blockquote> <p>Tue Aug 20 20:01:52 [conn8526] DBClientCursor::init call() failed Tue Aug 20 20:01:52 [conn3897] ns: user.dev could not initialize cursor across all shards because : stale config detected for ns: user. dev ParallelCursor::_init @ s01/10.36.31.36:7100,10.42.50.24:7100,10.81.4.72:7100 attempt: 0 Tue Aug 20 20:01:52 [conn744] ns: user.dev could not initialize cursor across all shards because : stale config detected for ns: user.d ev ParallelCursor::_init @ s01/10.36.31.36:7100,10.42.50.24:7100,10.81.4.72:7100 attempt: 0</p> </blockquote> <p>I don't know why this mongod revieved so many connections, the chunks shows the sharding works well. <img src="https://i.stack.imgur.com/oXB7I.jpg" alt="enter image description here"></p>
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    1. PTQuestion
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    1. USSun Pengfei
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    1. COand i thinks auto-sharding is not stable now, you can also give me some better advice to rebuilt the server.
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      1. POMongos distribute too much query to one MongoD
      1. USSun Pengfei
    2. COwhich driver are you using?
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      1. POMongos distribute too much query to one MongoD
      1. USDylan Tong
    3. COYour config servers are out of sync and stale, what MongoDB version is this? Also what does your config server setup look like? Are they available at these times?
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      1. POMongos distribute too much query to one MongoD
      1. USSammaye
 

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