API to fetch shard_id inside mongo daemon

[Sandeep Joshi]

Is there an API to fetch the shard-id inside the mongo daemon ?

Something like "mongo::my_shard_id()" ?

https://github.com/mongodb/mongo/blob/master/src/mongo/s/shard_id.h

-Sandeep

[Kaloian Manassiev]

Hi Sandeep,

The way to do this from the shard is to use the ShardingState::getShardName method here - https://github.com/mongodb/mongo/blob/3de973e1fd98473fbf1605e2d6039214aa15b2a4/src/mongo/db/s/sharding_state.h#L100

The return type of this method is std::string, but it is compatible with ShardId.

One thing to keep in mind is that up to mongodb version 3.2, this value will be empty until the first time the shard gets contacted by a mongos or another shard. As of the latest master, this value should always be available once a shard is added to a cluster through the addShard command.

-Kal.

[Kaloian Manassiev]

One thing I forgot to mention is that in order to obtain the ShardingState instance for the server you need to use the static method ShardingState::get, which takes an OperationContext.

Hope this helps.

-Kal.

[Sandeep Joshi]

thanks Kal ! appreciate it

-Sandeep

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