DML Error during update query n1ql

Couchbase Server
1

Hi,

Now a days very often I am getting following error

Error: DML Error, possible causes include CAS mismatch or concurrent modificationFailed to perform update - cause: MCResponse status=KEY_EEXISTS, opcode=SET, opaque=0, msg: Data exists for key

This error occurs even when only one client is updating document.

Can any one help out in finding cause for this error.

Regards,
Srikar

2

To update document we need to read first and update. In mean time some one might be modified or document might locked. You need to retry as suggested here Concurrent Updates - DML Error