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https://issues.apache.org/jira/browse/PHOENIX-4903?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16613649#comment-16613649
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Josh Elser commented on PHOENIX-4903:
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{quote}To distribute the hash cache to region servers, the master node makes an
`AddServerCacheRequest` RPC to each region servers
{quote}
The HMaster does this? I thought this was coordinated by the client. Or maybe
the RS hosting system.catalog.
> Hash cache RPC uses O(N) memory on master
> -----------------------------------------
>
> Key: PHOENIX-4903
> URL: https://issues.apache.org/jira/browse/PHOENIX-4903
> Project: Phoenix
> Issue Type: Improvement
> Reporter: Marcell Ortutay
> Priority: Major
>
> To distribute the hash cache to region servers, the master node makes an
> `AddServerCacheRequest` RPC to each region servers. If there are N region
> servers, it makes N of these RPC's. For each of the region servers, it
> generates a serialized RPC message and sends it out. This happens
> concurrently, and the result is that it uses O(N) memory on the master.
> As an example, if the `AddServerCacheRequest` RPC message is 100MB, and you
> have a cluster of 100 nodes, it would use 10GB memory on the master,
> potentially resulting in an "OutOfMemory" exception.
> It would be better if the master could use O(1) memory for the RPC.
> I observed this behavior in Phoenix 4.14.1
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