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https://issues.apache.org/jira/browse/HBASE-25874?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Wellington Chevreuil resolved HBASE-25874.
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Release Note:
RegionsOnUnknownServersRecoverer parses the master log to identify unknown
servers with regions assigned with, in meta table. This condition may happen in
the event of recovering previously destroyed clusters, where new Master/RS
names completely differ from the previous ones currently stored in meta table
(see HBASE-24286).
NOTE: This tool is useful for clusters runing hbase versions lower than 2.2.7,
2.3.5 and 2.4.7.
For any of these versions or higher, HBCK2 'recoverUnknown' option can be used
as a much simpler solution.
This tool requires the master logs path as parameter. Assuming classpath is
properly set, can be run as follows:
$ hbase org.apache.hbase.RegionsOnUnknownServersRecoverer PATH_TO_MASTER_LOGS
[dryRun]
The dryRun optional parameter will just parse the logs and print the list of
unknown servers, without invoking hbck2 scheduleRecoveries command.
RegionsOnUnknownServersRecoverer parses master log file searching for specific
messages mentioning "unknown servers". Once "unknown servers" are found, it
then uses HBCK2.scheduleRecoveries to submit SCPs for each of these "unknown
servers".
Resolution: Fixed
> [hbase-operator-tools]Add tool for identifying "unknown servers" from master
> logs, then submit SCPs for each of those.
> ----------------------------------------------------------------------------------------------------------------------
>
> Key: HBASE-25874
> URL: https://issues.apache.org/jira/browse/HBASE-25874
> Project: HBase
> Issue Type: New Feature
> Affects Versions: hbase-operator-tools-1.1.0
> Reporter: Wellington Chevreuil
> Assignee: Wellington Chevreuil
> Priority: Major
> Fix For: hbase-operator-tools-1.2.0
>
>
> Mostly useful when reusing hbase data dir from a previously destroyed cluster
> to a new cluster definition (see HBASE-24286) with hbase versions prior to
> 2.2.7, 2.3.5 and 2.4.7, where there's no support for
> *scheduleSCPsForUnknownServers*.
> *HBCK2* has this *scheduleRecoveries* method, that submits SCPs for
> individual RS names passed as parameter, but it still requires operators to
> manually parse these unknown server names from master logs in order to build
> the command. This tool automates the parsing step, building the list of
> proper server names, then reusing *HBCK2.scheduleRecoveries* to trigger SCPs.
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