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https://issues.apache.org/jira/browse/HBASE-23103?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16945030#comment-16945030
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Duo Zhang commented on HBASE-23103:
-----------------------------------
AsyncRpcRetryingCaller is the base class for retrying caller of normal
read/write.
And for altering meta, I do not think keep the state transient can solve all
the problems. It has inherent complexity. Master startup needs meta table
online as we need to scan meta, and here want to disable meta. Even if we
automatically make meta enabled, we may still hit problems, for example, the
ModifyTableProcedure is only half done and assume that meta table is disabled,
but after restarting, meta table is enabled, and the procedure can not
continue...
As now, altering a table does not need to disable the table, I suggest we still
keep meta always enabled, and add special logic to deal with meta table in
ModifyTableProcedure, SplitTableRegionProcedure, MergeTableRegionsProcedure,
etc.
Thanks.
> Survey incidence of table state queries
> ---------------------------------------
>
> Key: HBASE-23103
> URL: https://issues.apache.org/jira/browse/HBASE-23103
> Project: HBase
> Issue Type: Sub-task
> Reporter: Michael Stack
> Priority: Blocker
> Fix For: 3.0.0
>
>
> Task that comes of parent issue. Parent makes it so we go via Master to
> figure state of a table. It is the authority and since the parent issues adds
> being able to enable/disable hbase:meta, table state is now in two places --
> in hbase:meta table... and elsewhere for the hbase:meta's state. Rather than
> have client go to two locations dependent on which table is being asked
> about, parent made it so we went to master. Parent allows that this puts more
> load on the Master. [~zhangduo] brings up the valid concern that it might be
> too much or that dependent on the Master for state puts Master too much
> in-line with read/writes.
> This issue is a survey to figure how much load and how much state-in-master
> could mess up inline read/writes.
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