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From "Jonathan Gray (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HBASE-3168) Sanity date and time check when a region server joins the cluster
Date Mon, 01 Nov 2010 20:08:25 GMT

    [ https://issues.apache.org/jira/browse/HBASE-3168?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12927124#action_12927124
] 

Jonathan Gray commented on HBASE-3168:
--------------------------------------

I'd say because of the issues you point it, it makes more sense to use a new value rather
than the startCode.

> Sanity date and time check when a region server joins the cluster
> -----------------------------------------------------------------
>
>                 Key: HBASE-3168
>                 URL: https://issues.apache.org/jira/browse/HBASE-3168
>             Project: HBase
>          Issue Type: Improvement
>          Components: regionserver
>    Affects Versions: 0.89.20100924
>         Environment: RHEL 5.5 64bit, 1 Master 4 Region Servers
>            Reporter: Jeff Whiting
>         Attachments: HBASE-3168-trunk-v1.txt
>
>
> Introduce a sanity check when a RS joins the cluster to make sure its clock isn't too
far out of skew with the rest of the cluster.  If the RS's time is too far out of skew then
the master would prevent it from joining and RS would die and log the error. 
> Having a RS with even small differences in time can cause huge problems due to how bhase
stores values with timestamps.
> According to J-D in ServerManager we are already doing: 
> {code}
>     HServerInfo info = new HServerInfo(serverInfo);
>     checkIsDead(info.getServerName(), "STARTUP");
>     checkAlreadySameHostPort(info);
>     recordNewServer(info, false, null);
> {code}
> And that the new check would fit in nicely there.
> JG suggests we add a "ClockOutOfSync-like exception"

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