Ranger User sync does not work due to ERROR UserGroupSync [UnixUserSyncThread]

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Ranger User sync does not work due to ERROR UserGroupSync [UnixUserSyncThread]

Category : Bigdata

If we have enabled AD/LDAP user sync in ranger and we get below error then we need to follow given steps to resolve it.

LdapUserGroupBuilder [UnixUserSyncThread] – Updating user count: 148, userName:, groupList: [test, groups]
09 Jun 2016 09:04:34 ERROR UserGroupSync [UnixUserSyncThread] – Failed to initialize UserGroup source/sink. Will retry after 3600000 milliseconds. Error details:
javax.naming.PartialResultException: Unprocessed Continuation Reference(s); remaining name ‘dc=companyName,dc=com’
at com.sun.jndi.ldap.LdapCtx.processReturnCode(LdapCtx.java:2866)
at com.sun.jndi.ldap.LdapCtx.processReturnCode(LdapCtx.java:2840)
at com.sun.jndi.ldap.LdapNamingEnumeration.getNextBatch(LdapNamingEnumeration.java:147)
at com.sun.jndi.ldap.LdapNamingEnumeration.hasMoreImpl(LdapNamingEnumeration.java:216)
at com.sun.jndi.ldap.LdapNamingEnumeration.hasMore(LdapNamingEnumeration.java:189)
at org.apache.ranger.ldapusersync.process.LdapUserGroupBuilder.updateSink(LdapUserGroupBuilder.java:318)
at org.apache.ranger.usergroupsync.UserGroupSync.run(UserGroupSync.java:58)
at java.lang.Thread.run(Thread.java:745)

Root Cause:  When ranger usersync is set for ranger.usersync.ldap.referral = ignore the ldap search will prematurely fail when it encounters additional referrals.


  1. Change base db to dc=companyName,dc=com from cn=Users,dc=companyName,dc=com
  2. Also change ranger.usersync.ldap.referral = follow from ranger.usersync.ldap.referral = ignore

So in this way it will resolve the above issue. I hope it helped you to solve your issue very easily.

Please feel free to give feedback or suggestion for any improvements.

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