Known Issues

Ambari 2.7.4 has the following known issues, scheduled for resolution in a future release.

Table 1. Ambari 2.7.4 Known Issues
Apache Jira	Hortonworks Bug ID	Problem	Solution
N/A	BUG-120773	EU: Oozie SC fails java.io.IOException: Error while connecting Oozie server	If Ranger HA and/or Oozie Server HA is configured and a custom composite keytab file is being used, service checks for Ranger and Oozie will fail during the HDP 2.6 to HDP 3.1 Upgrade. Re-create the custom Ranger and/or Oozie Server keytab files and re-try the service check, or ignore and proceed past the service check.
N/A	BUG-121044	Storm service check failed after disabling kerberos	We should create ZooKeeper superuser and remove/change permissions for credentials znode. Here are the detailed steps: Login to any node with ZooKeeper Client and create digest for selected user:password pair: `export ZK_CLASSPATH=/etc/zookeeper/conf/:/usr/hdp/current/zookeeper-server/lib/:/usr/hdp/current/zookeeper-server/ java -cp $ZK_CLASSPATH org.apache.zookeeper.server. auth.DigestAuthenticationProvider super:super123` where super:super123 is the user:password pair. We will get digest in output: `super:super123->super:UdxDQl4f9v5oITwcAsO9bmWgHSI=` Update "zookeeper-env template" property on ZooKeeper service page with adding following line: `export SERVER_JVMFLAGS="$SERVER_JVMFLAGS -Dzookeeper. DigestAuthenticationProvider.superDigest=super:UdxDQl4f9v5oITwcAsO9bmWgHSI="` User should replace proposed digest with got one in previous step. Restart all required services. Login to any node with ZooKeeper Client and connect to ZooKeeper console: `/usr/hdp/current/zookeeper-client/bin/zkCli.sh -server <zookeeperServerHostFQDN>:2181` Remove/change permissions for credential znode. User should use value of Storm's storm.zookeeper.root property instead <stormRoot>: `delete /<stormRoot>/credentials` or update permissions to available-to-all: `setAcl /<stormRoot>/credentials world:anyone:cdrwa` After following the steps mentioned above Storm service check starts to pass.
N/A	BUG-120925	Hbase Service check fails after upgrading to Ambari 2.7.4.0	Make sure HDFS service is fully started and then restart the HBase service.
N/A	BUG-113993	Document known issue with disabling security in AMS. On a cluster on which security was enabled in the past, if it is disabled, metrics collector start fails with an error.	Clear out the data on the znode specified in ams-hbase-site:zookeeper.znode.parent. If AMS is in embedded mode, this can be done by deleting the directory as specified in the ams-hbase-site property 'HBase ZooKeeper Property DataDir'. If AMS is in distributed mode, this can be done by deleting the znode in cluster zookeeper using zkCli. Instead of deleting the znode, changing the value of the znode from /ams-hbase-unsecure to something like /ams-hbase-unsecure-new is also OK.
N/A	BUG-121151	Smartsense service does not start when upgrading from Ambari 2.7.1 (or older) to 2.7.4 on Debian 9 with openssl 1.1.0k installed.	Disable starting of SmartSense services pre-upgrade. SmartSense services can only be started once upgrade to Ambari 2.7.4.0 is successful.
N/A	BUG-105092	Oozie service check failure on HA cluster during EU	If Ranger HA and/or Oozie Server HA is configured and a custom composite keytab file is being used, service checks for Ranger and Oozie will fail during the HDP 2.6 to HDP 3.0 Upgrade.