mongdb 集羣中removeShard

問題描述：在removeShard時，remaining.chunks的值一直不變

查看share的日誌發現 有警告

cannot move chunk: 
the maximum number of documents for a chunk is 250001 , 
the maximum chunk size is 67108864 , 
average document size is 235. 
Found 270976 documents in chunk  
ns: normalhandergps.normalgps1 { key: "" } -> { key: "" } 

原來是由於chunk過大

因此只要在config中修改chunk大小就能夠了

db.settings.save( { _id:"chunksize", value: <size> } )

 

　mongodb的這塊的源碼地址 https://searchcode.com/codesearch/view/9360945/　　

  對這塊有不錯的解釋的地址 http://www.udpwork.com/item/12962.html