Fixed Issues in Apache Kudu

Review the list of Apache Kudu issues that are resolved in Cloudera Runtime 7.2.11.

KUDU-2181: Fix duplicate master address and remove unsafe flag tag

Kudu now supports Raft configuration change for Kudu masters and CLI tools for orchestrating addition and removal of masters in a Kudu cluster. These tools substantially simplify the process of migrating to multiple masters, recovering a dead master and removing masters from a Kudu cluster. For detailed steps, see the latest administration documentation. This feature is evolving and the steps to add, remove and recover masters may change in the future.

KUDU-3273: Fix NPE in AsyncKuduClient.discoverTablets() following the removal of a partition

A bug in the metacache of the Kudu Java client lead to a NullPointerException thrown. The bug manifested itself in situations when a range in a table was dropped after a client application had already opened the table.

KUDU-3277: Fix concurrent session flush issue in Java client

Fixed bug in Kudu Java client which manifested in AUTO_FLUSH_BACKGROUND sessions hung in a call to KuduSession.flush() method. Another sign of the bug were stuck data ingest workloads based on Java client (e.g., kudu-spark applications) with "java.lang.AssertionError: This Deferred was already called!" message in the logs.