Xiaolin Ha created HBASE-22767:
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Summary: System table RIT STUCK if their RSGroup has no highest
version RSes
Key: HBASE-22767
URL: https://issues.apache.org/jira/browse/HBASE-22767
Project: HBase
Issue Type: Bug
Components: rsgroup
Reporter: Xiaolin Ha
Assignee: Xiaolin Ha
AM chooses highest version region servers as participants for system tables,
including META table. If system table group has no highest version region
servers, then the reassignment of their regions will be always the BOGUS server
defined in RSGroup.
In our test environment using branch-2.2, we isolate system tables in a rsgroup
containing only one server. And when upgrading RSs, we have met the problem
that META is always assigned to the BOGUS server while the group server has
already been online for a while. META RIT is stuck and can not be recovered by
hbck2.
I made a UT reproduce this problem, steps are:
1. add a group, move 1 server to it;
2. move meta table to the group;
3. restart the group server and downgrade its version;
4. meta rit stuck.
ROOT cause is AM filters highest version RSs for system tables. So if we do not
change the versions of system table group servers, but upgrade the versions of
other group servers, then if there is reassignment for any system tables, such
as balancer moving their regions, RIT STUCK!!
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