原因是使用findandmodify中的query 条件对应的字段没有建索引，导致mongo查询缓慢，形成工作队列，在mongo中建好索引后问题得到解决。
db.demo.createIndex({"id": 1}, {name: "index_id"});
参考链接：点击打开链接
I have some problem.
I am actually getting this error because of a lot updates without the right index.
It looks like each update requires too much time, so the queue of operations increases, and a lock related timeout is fired, and the operations on the queue are dropped out.After having setted the index up, the error does not appear anymore.
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