DatabaseError.CONCURRENT_MODIFICATION error

[Qian Huang]

Hi,

when I send mutateMembers requests, there are a 
lots DatabaseError.CONCURRENT_MODIFICATION error:
<soap:Body>
       <soap:Fault>
           <faultcode>soap:Client</faultcode>
           <faultstring>[DatabaseError.CONCURRENT_MODIFICATION @ 
com.google.ads.api.services.campaignmgmt.common.error.DatabaseError.&lt;init&gt;(Datab]
</faultstring>
           <detail>
               <ns2:ApiExceptionFault xmlns=
"https://adwords.google.com/api/adwords/cm/v201809"; xmlns:ns2=
"https://adwords.google.com/api/adwords/rm/v201809";>
                   <message>[DatabaseError.CONCURRENT_MODIFICATION @ 
com.google.ads.api.services.campaignmgmt.common.error.DatabaseError.&lt;init&gt;(Datab]
</message>
                   <ApplicationException.Type>ApiException
</ApplicationException.Type>
                   <errors xmlns:xsi=
"http://www.w3.org/2001/XMLSchema-instance"; xsi:type="DatabaseError">
                       <fieldPath/>
                       <trigger/>
                       <errorString>DatabaseError.CONCURRENT_MODIFICATION
</errorString>
                       <ApiError.Type>DatabaseError</ApiError.Type>
                       <reason>CONCURRENT_MODIFICATION</reason>
                   </errors>
               </ns2:ApiExceptionFault>
           </detail>
       </soap:Fault>
   </soap:Body>


most of my requests only wrap hashed email, hashed phoneNumber and address, 
example as below:
...
       <mutateMembers xmlns=
"https://adwords.google.com/api/adwords/rm/v201809";>
           <operations>
               <ns7:operator xmlns:ns7=
"https://adwords.google.com/api/adwords/cm/v201809";>ADD</ns7:operator>
               <operand>
                   <userListId>0000000</userListId>
                   <removeAll>false</removeAll>
                   <membersList>
                       <hashedEmail>123123123123123adfadfadfadfasdf0</
hashedEmail>
                       <hashedPhoneNumber>asdfasdfasdfasdfasdfasdfsdf<
/hashedPhoneNumber>
                       <addressInfo>
                           <hashedFirstName>asdfasdfasdfasdfasdfasdfadsf</
hashedFirstName>
                           <hashedLastName>asdfasfasdfdf12313434234<
/hashedLastName>
                           <countryCode>ES</countryCode>
                           <zipCode>123124</zipCode>
                       </addressInfo>
                   </membersList>
....



>From the adwords api documentation, it may happen when we modify the same 
entity concurrently.

My question is how to identify an entity in my case? or say what's the 
primary field to identify an entity?

And could you give some suggestions about how to avoid this exception?

Best Regards,
Qian

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