Cluster with too many regions cannot withstand some master failover scenarios
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Key: HBASE-4246
URL: https://issues.apache.org/jira/browse/HBASE-4246
Project: HBase
Issue Type: Bug
Components: master, zookeeper
Affects Versions: 0.90.4
Reporter: Todd Lipcon
Priority: Critical
Fix For: 0.94.0
We ran into the following sequence of events:
- master startup failed after only ROOT had been assigned (for another reason)
- restarted the master without restarting other servers. Since there was at
least one region assigned, it went through the failover code path
- master scanned META and inserted every region into /hbase/unassigned in ZK.
- then, it called "listChildren" on the /hbase/unassigned znode, and crashed
with "Packet len6080218 is out of range!" since the IPC response was larger
than the default maximum.
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