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POMongoDB writeback exception
 

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    <p>Our mongodb cluster in production, is a sharded cluster with 3 replica sets with 3 server each one and, of course, another 3 config servers.</p> <p>We also have 14 webservers that connect directly to mongoDb throw the mongos process that are running in each of this webservers (clients).</p> <p>The entire cluster receive 5000 inserts per minute.</p> <p>Sometimes, we start getting exceptions from our java applications when it wants to perform operations to the mongoDb.</p> <p>This is the stackTrace:</p> <pre><code>caused by com.mongodb.MongoException: writeback com.mongodb.CommandResult.getException(CommandResult.java:100) com.mongodb.CommandResult.throwOnError(CommandResult.java:134) com.mongodb.DBTCPConnector._checkWriteError(DBTCPConnector.java:142) com.mongodb.DBTCPConnector.say(DBTCPConnector.java:183) com.mongodb.DBTCPConnector.say(DBTCPConnector.java:155) com.mongodb.DBApiLayer$MyCollection.insert(DBApiLayer.java:270) com.mongodb.DBApiLayer$MyCollection.insert(DBApiLayer.java:226) com.mongodb.DBCollection.insert(DBCollection.java:147) com.mongodb.DBCollection.insert(DBCollection.java:90) com.mongodb.DBCollection$insert$0.call(Unknown Source) </code></pre> <p>If I check the mongos process throw the rest _status command that it provides, it returns a 200OK. We could fix the problem restarting the tomcat that we are using and restarting the mongos process but I would like to find a final solution to this problem. It's not a happy solution to have to restart everything in the middle of the night.</p> <p>When this error happens, maybe 2 or 3 another webservers got the same error at the same time, so I imagine that there is a problem in the entire mongoDb cluster, no a problem in a single isolated webserver.</p> <p>Does anyone know why mongo returns a writeback error? and how to fix it?</p> <p>I'm using mongoDb 2.2.0.</p> <p>Thanks in advance.</p> <p>Fer</p>
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