Andrew Purtell created HBASE-20670:
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Summary: NPE in HMaster#isInMaintenanceMode
Key: HBASE-20670
URL: https://issues.apache.org/jira/browse/HBASE-20670
Project: HBase
Issue Type: Bug
Affects Versions: 1.3.2
Reporter: Andrew Purtell
Assignee: Andrew Purtell
Fix For: 1.5.0, 1.3.3, 1.4.5
{noformat}
Problem accessing /master-status. Reason: INTERNAL_SERVER_ERROR
Caused by: java.lang.NullPointerException
at org.apache.hadoop.hbase.master.HMaster.isInMaintenanceMode(HMaster.java:2559)
{noformat}
The ZK trackers, including the maintenance mode tracker, are initialized only
after we try to bring up the filesystem. If HDFS is in safe mode then an access
to the master status page trips over this problem. There might be other issues
after we fix this, but NPE Is always a bug, so let's address it. One option is
to connect the ZK based components with ZK before attempting to bring up the
filesystem. Let me try that first. If that doesn't work we could at least throw
an IOE.
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