ZK event thread waiting for root region while server shutdown handler waiting
for event thread to finish distributed log splitting to recover the region
sever the root region is on
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Key: HBASE-5099
URL: https://issues.apache.org/jira/browse/HBASE-5099
Project: HBase
Issue Type: Bug
Affects Versions: 0.92.0, 0.94.0
Reporter: Jimmy Xiang
A RS died. The ServerShutdownHandler kicked in and started the logspliting.
SpliLogManager
installed the tasks asynchronously, then started to wait for them to complete.
The task znodes were not created actually. The requests were just queued.
At this time, the zookeeper connection expired. HMaster tried to recover the
expired ZK session.
During the recovery, a new zookeeper connection was created. However, this
master became the
new master again. It tried to assign root and meta.
Because the dead RS got the old root region, the master needs to wait for the
log splitting to complete.
This waiting holds the zookeeper event thread. So the async create split task
is never retried since
there is only one event thread, which is waiting for the root region assigned.
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