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From "Jim Kellerman (JIRA)" <j...@apache.org>
Subject [jira] Updated: (HBASE-773) Service Historian
Date Tue, 21 Oct 2008 22:32:44 GMT

     [ https://issues.apache.org/jira/browse/HBASE-773?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Jim Kellerman updated HBASE-773:
--------------------------------

    Fix Version/s: 0.20.0

> Service Historian
> -----------------
>
>                 Key: HBASE-773
>                 URL: https://issues.apache.org/jira/browse/HBASE-773
>             Project: Hadoop HBase
>          Issue Type: New Feature
>          Components: master
>    Affects Versions: 0.18.0
>            Reporter: Andrew Purtell
>            Priority: Minor
>             Fix For: 0.20.0
>
>
> The Region Historian (see HBASE-533) is very useful for debugging issues on the cluster
involving region splitting, assignment, etc. It would be additionally useful if the master
could keep a separate history of regionservers, when they:
> * start up and report in
> * quiesce/exit when the master tells them to
> * fail (and report error?) and exit
> * are declared dead after their lease expires
> * are assigned a region (some overlap with Region Historian but is a different view)
> * are asked to close a region  (some overlap with Region Historian but is a different
view)
> Maybe call it a Service Historian?
> There should be event logs per regionserver identity, available even if a regionserver
is offline. The logs can have a simple structure: Timestamp, Event, Description, like the
Region Historian tables. 
> Otherwise it is still necessary to comb through logs to determine if a regionserver was
flaky during a period of time. 
> Additionally, if regionservers can send an error string when they abort and restart,
such that the errors can be viewed in a service history table, that would be really helpful.
> Hyperlinks in the service history table would make it easy to follow a table and its
regions over the lifetime of the system, a reconstruction essentially of the client view of
the cluster over time. 

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