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https://issues.apache.org/jira/browse/SLIDER-174?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14046101#comment-14046101
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Ted Yu commented on SLIDER-174:
-------------------------------
In HBase 1.0+, the master process is merged with region server process which
hosts hbase:meta.
This means that during the period when master starts on another node, clients
may have trouble communicating with the cluster.
> HBase Master needs data locality
> --------------------------------
>
> Key: SLIDER-174
> URL: https://issues.apache.org/jira/browse/SLIDER-174
> Project: Slider
> Issue Type: Task
> Reporter: Ted Yu
> Assignee: Ted Yu
>
> Currently:
> {code}
> // Master doesn't need data locality
> ROLES.add(new ProviderRole(HBaseKeys.ROLE_MASTER,
> KEY_MASTER,PlacementPolicy.NO_DATA_LOCALITY));
> {code}
> But in RoleHistory#findNodeForNewInstance():
> {code}
> if (role.getNoDataLocality()) {
> return null;
> }
> {code}
> This implies that HBase master instances might be scheduled on one host,
> obviating the goal for HA.
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