6.4. Known Issues for HBase

HBase RegionServers fails to shutdown.

Problem: RegionServers may fail to shutdown. The following error is reported in the RegionServer log file:

INFO org.apache.hadoop.hdfs.DFSClient: Could not complete /apps/hbase/data/test_hbase/3bce795c2ad0713505f20ad3841bc3a2/.tmp/27063b9e4ebc4644adb36571b5f76ed5 retrying...

and the following error is reported in the NameNode log file:

ERROR org.apache.hadoop.security.UserGroupInformation: PriviledgedActionException as:hbase cause:org.apache.hadoop.hdfs.server.namenode.SafeModeException: Cannot complete /apps/hbase/data/test_hbase/3bce795c2ad0713505f20ad3841bc3a2/.tmp/27063b9e4ebc4644adb36571b5f76ed5. Name node is in safe mode.

Taking snapshot on Oracle Linux and Java version 1.6.0_31, may occasionally result in spurious Timeout error.

The workaround is to retry taking the snapshot.