[jira] [Commented] (HBASE-27355) Separate meta read requests from master and client

["ruanhui (Jira)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/HBASE-27355?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17614716#comment-17614716 ] 

ruanhui commented on HBASE-27355:
---------------------------------

Hi Duo

Do you think we can use an additional RpcExecutor to specifically serve all internal system table requests ?

Not only the master, the regionservers also accesses the system tables, like hbase:quota and hbase:replication. So if clients retry a lot, the replication maybe be blocked too(if we deploy hbase:meta and hbase:replication on same regionserver, which is common in our production to using a specific rsgroup to hold all system tables). Based on this consideration, is it better to seperate intenal requests (both from masters and regionservers, including the requests from CatalogJanitor) and client requests ?

> Separate meta read requests from master and client 
> ---------------------------------------------------
>
>                 Key: HBASE-27355
>                 URL: https://issues.apache.org/jira/browse/HBASE-27355
>             Project: HBase
>          Issue Type: Improvement
>          Components: IPC/RPC
>    Affects Versions: 3.0.0-alpha-3
>            Reporter: ruanhui
>            Assignee: ruanhui
>            Priority: Minor
>             Fix For: 3.0.0-alpha-4
>
>
> If we have a large number of store files in a single region or the response from hdfs is slow, the region transition can be slow, the client may put a lot of pressure on the meta server when retrying. This may block the master system read requests. Maybe we can set a special priority for the master request to isolate read requests from master and client.



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