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Posted to dev@hbase.apache.org by "stack (JIRA)" <ji...@apache.org> on 2018/10/26 22:40:00 UTC
[jira] [Reopened] (HBASE-21191) Add a holding-pattern if no assign
for meta or namespace (Can happen if masterprocwals have been cleared).
[ https://issues.apache.org/jira/browse/HBASE-21191?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
stack reopened HBASE-21191:
---------------------------
Reopening so can backport to branch-2.0.
> Add a holding-pattern if no assign for meta or namespace (Can happen if masterprocwals have been cleared).
> ----------------------------------------------------------------------------------------------------------
>
> Key: HBASE-21191
> URL: https://issues.apache.org/jira/browse/HBASE-21191
> Project: HBase
> Issue Type: Sub-task
> Components: amv2
> Reporter: stack
> Assignee: stack
> Priority: Major
> Fix For: 2.1.1
>
> Attachments: HBASE-21191.branch-2.0.001.patch, HBASE-21191.branch-2.1.001.patch, HBASE-21191.branch-2.1.002.patch, HBASE-21191.branch-2.1.003.patch, HBASE-21191.branch-2.1.004.patch, HBASE-21191.branch-2.1.005.patch, HBASE-21191.branch-2.1.006.patch, HBASE-21191.branch-2.1.007.patch
>
>
> If the masterprocwals have been removed -- operator error, hdfs dataloss, or because we have gotten ourselves into a pathological state where we have hundreds of masterprocwals too process and it is taking too long so we just want to startover -- then master startup will have a dilemma. Master startup needs hbase:meta to be online. If the masterprocwals have been removed, there may be no outstanding assign or a servercrashprocedure with coverage for hbase:meta (I ran into this issue repeatedly in internal testing purging masterprocwals on a large test cluster). Worse, when master startup cannot find an online hbase:meta, it exits after exhausting the RPC retries.
> So, we need a holding-pattern for master startup if hbase:meta is not online if only so an operator can schedule an assign for meta or so they can assign fixup procedures (HBASE-21035 has discussion on why we cannot just auto-schedule an assign of meta).
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