[HBASE-19314] Column family with name "=" cause region in transition

• Type: Bug
• Status: Open
• Priority: Major
• Resolution: Unresolved
• Affects Version/s: 1.2.0
• Component/s: Region Assignment

Environment

Server - AWS r4.2xlarge - 8 cores, 60 Gb RAM
OS - CentOS 7
Java - 1.8.0_121
HBase Version 1.2.0

• Assignee: Unassigned
• Reporter: Denys Vergiles
• Created: 21/Nov/17 10:10
• Updated: 21/Nov/17 10:10

Description

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)

hbase hbck

17/11/14 13:31:16 INFO util.HBaseFsck: Handling overlap merges in parallel. set hbasefsck.overlap.merge.parallel to false to run serially.
ERROR: There is a hole in the region chain between  and .  You need to create a new .regioninfo and region dir in hdfs to plug the hole.
ERROR: Found inconsistency in table some_namespace:points

Table example

escribe 'some_namespace:points'
Table some_namespace:points is ENABLED                                                                                                                                                                              
some_namespace:points, {TABLE_ATTRIBUTES => {coprocessor$1 => 'hdfs://localhost:9000/test/coprocessor.jar%7Ccoprocessor%7C107374182
3|', METADATA => {'HBASE_NAMESPACE' => 'some_namespace', 'KAFKA_BROKERS_IDS' => '/brokers/ids', 'KAFKA_TOPIC' => 'coprocessor-data', 'points_TO_GROUP_TTL' => '3600', 'ZOOKEEPER_ROOT' => '/'}}    
COLUMN FAMILIES DESCRIPTION                                                                                                                                                                                
{NAME => '=', BLOOMFILTER => 'ROW', VERSIONS => '1', IN_MEMORY => 'false', KEEP_DELETED_CELLS => 'FALSE', DATA_BLOCK_ENCODING => 'DIFF', TTL => 'FOREVER', COMPRESSION => 'NONE', MIN_VERSIONS => '0', BLOC
KCACHE => 'true', BLOCKSIZE => '65536', REPLICATION_SCOPE => '0'}                                                                                                                                          
{NAME => 'i', BLOOMFILTER => 'ROW', VERSIONS => '1', IN_MEMORY => 'false', KEEP_DELETED_CELLS => 'FALSE', DATA_BLOCK_ENCODING => 'DIFF', TTL => 'FOREVER', COMPRESSION => 'NONE', MIN_VERSIONS => '0', BLOC
KCACHE => 'true', BLOCKSIZE => '65536', REPLICATION_SCOPE => '0'}                                                                                                                                          
{NAME => 'm', BLOOMFILTER => 'ROW', VERSIONS => '1', IN_MEMORY => 'false', KEEP_DELETED_CELLS => 'FALSE', DATA_BLOCK_ENCODING => 'DIFF', TTL => 'FOREVER', COMPRESSION => 'NONE', MIN_VERSIONS => '0', BLOC
KCACHE => 'true', BLOCKSIZE => '65536', REPLICATION_SCOPE => '0'}