Ctest created HBASE-23702:
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Summary: `hbase.hstore.flusher.count` setting to 0 breaks HMaster
Key: HBASE-23702
URL: https://issues.apache.org/jira/browse/HBASE-23702
Project: HBase
Issue Type: Bug
Components: regionserver
Affects Versions: 2.2.3
Environment: HBase-2.2.3
Java openjdk 1.8.0_222
Ubuntu 18.04
Reporter: Ctest
*Summary*
The configuration parameter `hbase.hstore.flusher.count` allows `0` (which
turns out to be a bad value after I understand the source code).
When we set `hbase.hstore.flusher.count` to 0, HMaster will fail in 200,000 ms
without any error message, but
```
java.lang.RuntimeException: Master not initialized after 200000ms
```
There’s no messages pinpointing `hbase.hstore.flusher.count` being the root
cause.
0 means `MemStoreFlusher` is not alive. During the initialization time of
HMaster, `isHealthy()` will be called and it will try to check if
`MemStoreFlusher` is alive or not. However, since we set
`hbase.hstore.flusher.count` to 0, there will be no flusher created at the
first place, which cause`isHealthy()` to return false. As a consequence,
HRegionServer does not enter its main loop.
*How To Reproduce*
The version of Hadoop: 2.2.3
# Set the value of configuration parameter `hbase.hstore.flusher.count` to `0`
in “conf/hbase-site.xml”
# Start hbase by running “bin/start-hbase.sh”
# Wait for 3-4 minutes
# Open the log file “logs/hbase-<username>-master-<pcname>.log”
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