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https://issues.apache.org/jira/browse/HBASE-26235?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Duo Zhang updated HBASE-26235:
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Description:
The direct reason is that, after decoupling, HMaster does not extends
HRegionServer, so we do not have RegionServerAddressTracker now, so for backup
masters we do not have a way to get all the region server which means it can
not serve as connection registry any more, so we need to find a way to let
backup masters to also have a way to get the region server list.
But in general, since we already have a class in HMaster which is used to track
region servers, we'd better reuse it. And after this change, the backup masters
could also be used as the fallback servers for getting region server list in
HBASE-26220, which could also reduce the load of active master.
And this could also speed up the active master start process as we could save
one zookeeper scan when becoming active master.
was:
The direct reason is that, after decoupling, HMaster does not extends
HRegionServer, so we do not have RegionServerAddressTracker now, so for backup
masters we do not have a way to get all the region server which means it can
not serve as connection registry any more, so we need to find a way to let
backup masters to also have a way to get the region server list.
But in general, since we already have a class in HMaster which is used to track
region servers, we'd better reuse it. And after this change, the backup masters
could also be used as the fallback servers for getting region server list in
HBASE-26220, which could also reduce the load of active master.
> We could start RegionServerTracker before becoming active master
> ----------------------------------------------------------------
>
> Key: HBASE-26235
> URL: https://issues.apache.org/jira/browse/HBASE-26235
> Project: HBase
> Issue Type: Sub-task
> Components: master, Zookeeper
> Reporter: Duo Zhang
> Assignee: Duo Zhang
> Priority: Major
>
> The direct reason is that, after decoupling, HMaster does not extends
> HRegionServer, so we do not have RegionServerAddressTracker now, so for
> backup masters we do not have a way to get all the region server which means
> it can not serve as connection registry any more, so we need to find a way to
> let backup masters to also have a way to get the region server list.
> But in general, since we already have a class in HMaster which is used to
> track region servers, we'd better reuse it. And after this change, the backup
> masters could also be used as the fallback servers for getting region server
> list in HBASE-26220, which could also reduce the load of active master.
> And this could also speed up the active master start process as we could save
> one zookeeper scan when becoming active master.
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