Jieshan Bean created HBASE-5927:
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Summary: AM#unassign should handle local exceptions after calling
sendRegionClose
Key: HBASE-5927
URL: https://issues.apache.org/jira/browse/HBASE-5927
Project: HBase
Issue Type: Bug
Components: master
Affects Versions: 0.92.1, 0.96.0, 0.94.1
Reporter: Jieshan Bean
Assignee: Jieshan Bean
Fix For: 0.92.2, 0.96.0, 0.94.1
A possible exception: If the related regionserver was just killed(But HMaster
has not perceived that), then we will get a local exception "Connection reset
by peer". If this region belongs to a disabling table. what will happen?
ServerShutdownHandler will remove this region from AM#regions. So this region
is still existing in RIT. TimeoutMonitor will take care of it after it got
timeout. Then invoke unassign again. But it has been removed from AM#regions,
so it will return directly due to the below code:
public void unassign(HRegionInfo region, boolean force) {
// TODO: Method needs refactoring. Ugly buried returns throughout. Beware!
LOG.debug("Starting unassignment of region " +
region.getRegionNameAsString() + " (offlining)");
synchronized (this.regions) {
// Check if this region is currently assigned
if (!regions.containsKey(region)) {
LOG.debug("Attempted to unassign region " +
region.getRegionNameAsString() + " but it is not " +
"currently assigned anywhere");
return;
}
}
Then it leads to an end-less loop.
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