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https://issues.apache.org/jira/browse/HBASE-20109?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Andrew Purtell updated HBASE-20109:
-----------------------------------
Description:
Right now the only public API available in branch-1 to the client to learn the
server name of the active master is Admin#getClusterStatus#getMaster, returning
ServerName. On a cluster of any size getClusterStatus is expensive, especially
if used only to retrieve the active master name.
Later versions have
{code}
ServerName Admin#getMaster()
{code}
for lightweight discovery of the active master location. Add this to branch-1.
was:
Right now the only public API available to the client to learn the server name
of the active master is Admin#getClusterStatus#getMaster, returning ServerName.
On a cluster of any size getClusterStatus is expensive, especially if used only
to retrieve the active master name.
Let's add a simple API
{code}
ServerName Admin#getMasterLocation()
{code}
for lightweight discovery of the active master location. This makes sense
because, weirdly, Admin already has a method getMasterInfoPort(), returning
int.
Internally the client has a notion of the active master because there is a
connection open to it, or one that can be reopened, or if for some reason it's
not easy to make a ServerName for that state, the ServerName can be
deserialized out of the znode tracking the active master location.
> Add Admin#getMaster API to branch-1
> -----------------------------------
>
> Key: HBASE-20109
> URL: https://issues.apache.org/jira/browse/HBASE-20109
> Project: HBase
> Issue Type: Improvement
> Components: Client
> Affects Versions: 1.4.2
> Reporter: Andrew Purtell
> Assignee: Andrew Purtell
> Priority: Minor
> Fix For: 1.5.0
>
>
> Right now the only public API available in branch-1 to the client to learn
> the server name of the active master is Admin#getClusterStatus#getMaster,
> returning ServerName. On a cluster of any size getClusterStatus is expensive,
> especially if used only to retrieve the active master name.
> Later versions have
> {code}
> ServerName Admin#getMaster()
> {code}
> for lightweight discovery of the active master location. Add this to branch-1.
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