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https://issues.apache.org/jira/browse/HBASE-18109?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16041461#comment-16041461
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Yi Liang commented on HBASE-18109:
----------------------------------
Hi [~stack],
:(, another problem comes, in TableDescriptor, we already have a set of
Priority, but the priority is for RPC
{code}
/**
* Relative priority of the table used for rpc scheduling
*/
private static final int DEFAULT_PRIORITY = HConstants.NORMAL_QOS;
{code}
So, I am not sure it is good to add another set of priority.
After fully review the code, I think original author has already made meta and
system table assigned first.
He use a queue called FairQueue to schedule procedures, and there are two
factors that may affect the rate of procedure in the queue to be scheduled, one
is procedure priority and other is the position of the procedure in the
FairQueue, any procedures with high priority(he add priority in
MasterProcedureScheduler, not in table) will be scheduled with high rate and
also procedures in front/head of FairQueue also has high rate to be scheduled.
Since original author has already make sure "meta/system table will be assigned
first with higher rate"; I think that will be enough for this jira, or we need
to change how ProcedureExcutor schedule procedures. As for Phil's problem, we
can open another jira for it, cause it is not very related to AM, lets now
focus more on ProcedureV2 AM.
(My old patch just make simple distinction between system table and user table,
it will put system table in front/head of FairQueue, which can theoretically
help to assign system table first. If you like it, we can add it into current
implementation)
> Assign system tables first (priority)
> -------------------------------------
>
> Key: HBASE-18109
> URL: https://issues.apache.org/jira/browse/HBASE-18109
> Project: HBase
> Issue Type: Sub-task
> Components: Region Assignment
> Affects Versions: 2.0.0
> Reporter: stack
> Assignee: Yi Liang
> Priority: Critical
> Fix For: 2.0.0
>
> Attachments: HBASE-18109-V1.patch
>
>
> Need this for stuff like the RSGroup table, etc. Assign these ahead of
> user-space regions.
> From 'Handle sys table assignment first (e.g. acl, namespace, rsgroup);
> currently only hbase:meta is first.' of
> https://docs.google.com/document/d/1eVKa7FHdeoJ1-9o8yZcOTAQbv0u0bblBlCCzVSIn69g/edit#heading=h.oefcyphs0v0x
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