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https://issues.apache.org/jira/browse/HBASE-20828?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16547915#comment-16547915
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stack commented on HBASE-20828:
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Another idea (From [~Apache9] down in HBASE-20878: "Maybe we could introduce a
state called ABNORMALLY_CLOSED, which indicates that the region will be
processed by SCP."
Also, explain lasthost in hbase:meta. See comment in HBASE-20878 "The lastHost
should not be used for critical condition... (See HBASE-20792)". Or, explain
all fields in hbase:meta and how they change -- after consideration (e.g. in
the case of info:sn/lasthost, the prescription is not to rely on it).
> Finish-up AMv2 Design/List of Tenets/Specification of operation
> ---------------------------------------------------------------
>
> Key: HBASE-20828
> URL: https://issues.apache.org/jira/browse/HBASE-20828
> Project: HBase
> Issue Type: Umbrella
> Components: amv2
> Reporter: stack
> Priority: Major
>
> AMv2 is missing specification. There are too many grey-areas still. Also
> missing are a concise listing of the tenets of AMv2 operation. Here are some
> examples:
> * HBASE-19529 "Handle null states in AM": Asks how we should treat null
> state in hbase:meta. What does it 'mean'. We seem to treat it differently
> dependent on context. Needs clarification. [~Apache9] recently asked similar
> about the meaning of OFFLINE.
> * Logging needs to have a particular form to help trace Procedure progress;
> needs a write-up.
> Lets fill in items to address in this umbrella issue. Can address in
> subissues and produce specification doc too. We have the below but these are
> mostly (incomplete) description for devs on pv2 and amv2; the specification
> is missing:
> http://hbase.apache.org/book.html#pv2
> http://hbase.apache.org/book.html#amv2
> (Other areas include addressing what is up w/ rollback -- when, how much, and
> when it is not appropriate -- as well as recommendation on Procedures
> coarseness, locking -- is it ok to lock table in alter table procedure for
> the life of the procedure? -- and so on).
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