7.1. Known Issues for Hadoop

JobTracker UI, JMX queries, and RPC calls somtimes hang in HA mode.

Problem: JobTracker becomes slow and non-responsive in HA mode because dfs.client.retry.policy.enabled is not set to 'final' and 'false' for the JobTracker.

Workaround:Set dfs.client.retry.policy.enabled to 'final' and 'false' only for the JobTracker. Clients (such as MapReduce, Pig, Hive, Oozie) should still be set to 'true' in HA mode.

Use of init.d scripts for starting or stopping Hadoop services, is not recommended.