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> The affected users do exist and are in groups. The failures occur when looking up groups from LDAP. It is not consistent either - sometimes the group lookups succeed and sometimes they do not. When the lookup fails, I see the following in /var/log/messages: Feb 23 15:37:52 nn01 nslcd[21501]: [37e80a] error reading from client: Success I started seeing this with nslcd 0.7.5, but have upgraded to 0.8.12 and have the same issue. I've also tried increasing the number of threads for nslcd, but that also did not help. Has anyone had similar issues? Thanks for your help! -- Andrew Johnson
