This is the documentation for CDH 5.1.x. Documentation for other versions is available at Cloudera Documentation.
Known Issues Fixed in CDH 5.1.0
The following topics describe known issues fixed in CDH 5.1.0.
Apache Hadoop
HDFS
— The same DataNodes may appear in the NameNode web UI in both the live and dead node lists
MapReduce
YARN Fair Scheduler's Cluster Utilization Threshold check is broken
Bug: YARN-2155
Severity: Medium
Workaround: Set the yarn.scheduler.fair.preemption.cluster-utilization-threshold property in yarn-site.xml to -1.
Apache HBase
— MapReduce over HBase Snapshot bypasses HBase-level security
The MapReduce over HBase Snapshot bypasses HBase-level security completely since the files are read from the HDFS directly. The user who is running the scan/job has to have read permissions to the data and snapshot files.
Bug: HBASE-8369
Severity: Medium
Workaround: MapReduce users must be trusted to process/view all data in HBase.
— HBase snapshots now saved to the /<hbase>/.hbase-snapshot directory
HBase snapshots are now saved to the /<hbase>/.hbase-snapshot directory instead of the /.snapshot directory. This was a conflict introduced by the HDFS snapshot feature in Hadoop 2.2/CDH 5 HDFS.
Bug: HBASE-8352
Severity: High
Workaround: This should be handled in the upgrade process.
Hue
— Oozie jobs don't support ResourceManager HA in YARN
If the ResourceManager fails, the workflow will fail.
Bug: None
Severity: Medium
Workaround: None
Apache Oozie
— Oozie HA does not work properly with HCatalog integration or SLA notifications
This issue appears when you are using HCatalog as a data dependency in a coordinator; using HCatalog from an action (for example, Pig) works correctly.
Bug: OOZIE-1492
Severity: Medium
Workaround: None
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