db.killOp() (mongosh method方法)

Kill Read Operations终止读取操作

The db.killOp() method can be run on a mongos and can kill queries (read operations) that are running on more than one shard in a cluster.db.killOp()方法可以在mongos上运行，并可以终止在集群中多个分片上运行的查询（读取操作）。

For example, to kill a query operation on a sharded cluster:例如，要终止分片集群上的查询操作：

Kill Write Operations终止写入操作

Within a Session在一次会话中

MongoDB drivers associate all operations with a server session, with the exception of unacknowledged writes.MongoDB驱动程序将所有操作与服务器会话相关联，但未确认的写入除外。

If the write operation is associated with a session, you can use the killSessions command on the mongos to kill the write operation across shards.如果写操作与会话相关联，则可以在mongos上使用killSessions命令来终止跨分片的写操作。

1. Run the aggregation pipeline $currentOp on the mongos to find the lsid (logical session id).在mongos上运行聚合管道$currentOp以查找lsid（逻辑会话id）。

   use admin
   db.aggregate( [
      { $currentOp : { allUsers: true, localOps: true } },
      { $match : <filter condition> } // Optional.  Specify the condition to find the op.
                                      // e.g. { "op" : "update", "ns": "mydb.someCollection" }
   ] )

   1. Using the returned lsid information, issue the killSessions command on the mongos to kill the operation on the shards.使用返回的lsid信息，在mongos上发出killSessions命令以终止分片上的操作。

      db.adminCommand( { killSessions: [
         { "id" : UUID("80e48c5a-f7fb-4541-8ac0-9e3a1ed224a4"), "uid" : BinData(0,"47DEQpj8HBSa+/TImW+5JCeuQeRkm5NMpJWZG3hSuFU=") }
      ] } )

Without a Session没有会话

If the write operation is not associated with a session, you must find and kill the operation on all the shards associated with the write.如果写入操作与会话无关，则必须在与写入相关的所有分片上找到并终止该操作。

1. From a mongos, run the aggregation pipeline $currentOp to find the opid(s) of the query operation on the shards:从mongos中，运行聚合管道$currentOp以查找分片上查询操作的opid：

   use admin
   db.aggregate( [
      { $currentOp : { allUsers: true } },
      { $match : <filter condition> } // Optional.  Specify the condition to find the op.
   ] )

   When run on a mongos, $currentOp returns the opids in the format of "<shardName>:<opid on that shard>"; e.g.在mongos上运行时，$currentOp以"<shardName>:<opid on that shard>"的格式返回opid；如。

   {
      "shard" : "shardB",
      ..
      "opid" : "shardB:79214",
      ...
   },
   {
      "shard" : "shardA",
      ..
      "opid" : "shardA:100913",
      ...
   },

2. Using the opid information, issue db.killOp() on the mongos to kill the operation on the shards.使用opid信息，对mongos发出db.killOp()以终止对分片的操作。

   db.killOp("shardB:79014");
   db.killOp("shardA:100813");