HA: entering SM after starting SBN can NPE
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Key: HDFS-2747
URL: https://issues.apache.org/jira/browse/HDFS-2747
Project: Hadoop HDFS
Issue Type: Sub-task
Components: ha
Affects Versions: HA branch (HDFS-1623)
Reporter: Eli Collins
Entering SM on the primary after while it's already in SM after the SBN is
started results in an NPE:
{noformat}
hadoop-0.24.0-SNAPSHOT $ ./bin/hdfs dfsadmin -safemode get
Safe mode is ON
hadoop-0.24.0-SNAPSHOT $ ./bin/hdfs dfsadmin -safemode enter
safemode: java.lang.NullPointerException
{noformat}
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