upgrade management metadata service from 2010 farm to 2013 farm: http://technet.microsoft.com/en-us/library/cc263299.aspx ,
get the following error when i try to open termstore in 2013 CA. it turned out that users in 2013 farm should be added into term store administrators.
Failed to deserialize permission. Exception: System.ArgumentException: identityToGetKeyFor
at Microsoft.SharePoint.Administration.Claims.SPClaimProviderManager.GetProviderUserKeyClaim(IClaimsIdentity claimsIdentity, SPClaim loginClaim)
at Microsoft.SharePoint.Administration.Claims.SPClaimProviderManager.GetProviderUserKey(IClaimsIdentity claimsIdentity, String encodedIdentityClaimSuffix)
at Microsoft.SharePoint.Administration.Claims.SPClaimProviderManager.GetProviderUserKey(String encodedIdentityClaimSuffix)
at Microsoft.SharePoint.Utilities.SPUtility.GetFullUserKeyFromFullName(String fullName)
at Microsoft.SharePoint.Administration.SPAcl`1.CreateAce(String principalName, T grantRightsMask, T denyRightsMask)
at Microsoft.SharePoint.Taxonomy.Internal.Security.DeserializePermission(IDataReader dataReader, SPAcl`1 acl, List`1 siteCollectionIds, SharedUrlStringCollection siteCollectionUrls)