Affects Version/s: 1.2.0
Fix Version/s: None
Component/s: Region Assignment
Server - AWS r4.2xlarge - 8 cores, 60 Gb RAM
OS - CentOS 7
Java - 1.8.0_121
HBase Version 1.2.0
During alter operation with namespaces i was able to create new column family with name '='.
I didn't find any restriction in setting column name to non-alphabetical sign.
Once column name is created, master server is fails to start due to infinite transition status of region server
The only possible solution which i found was to delete broken column families.
On attempt to clear status of all ephemeral nodes in zookeeper, did not allow to bring server back to life (https://community.cloudera.com/t5/Storage-Random-Access-HDFS/HBase-Region-in-Transition/m-p/26727#M1183)