mongoDB插入数据出现以下报错

Question

Write failed with error code 79 and error message 'No write concern mode named '1' found in replica set configuration at ShardSetA'; nested exception is com.mongodb.WriteConcernException: Write failed with error code 79 and error message 'No write concern mode named '1' found in replica set configuration at ShardSetA'![
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Answer 1

http://kyfxbl.iteye.com/blog/1952941