look for busy network resulting in network timeouts to LDAP server (assuming LDAP itself is not overloaded).
*.......* *“Life should not be a journey to the grave with the intention of arriving safely in apretty and well preserved body, but rather to skid in broadside in a cloud of smoke,thoroughly used up, totally worn out, and loudly proclaiming “Wow! What a Ride!” - Hunter ThompsonDaemeon C.M. ReiydelleUSA (+1) 415.501.0198London (+44) (0) 20 8144 9872* On Mon, Feb 23, 2015 at 10:03 AM, Jens Scheidtmann < [email protected]> wrote: > Dear Andrew, > > Increase the log level of this class to DEBUG. Then you should be able to > see what's going on. > > Best regards, Jens > > Am Montag, 23. Februar 2015 schrieb Andrew Johnson : > >> Hey everyone, >> >> I am seeing an intermittent issue with the Namenode looking up the groups >> for a given user. We are using JniBasedUnixGroupsMapping. >> >> I see messages like the following in the namenode logs: >> >> 015-02-23 15:42:37,184 WARN >> org.apache.hadoop.security.UserGroupInformation: No groups available for >> user <username> >> >>
