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https://issues.apache.org/jira/browse/HBASE-3168?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Jeff Whiting updated HBASE-3168:
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Attachment: HBASE-3168-trunk-v2.txt
Here is the latest patch with the new parameter "serverCurrentTime" added to
regionServerStartup. This patch was made against trunk.
A summary of some of the changes:
-Added "serverCurrentTime" to regionServerStartup
-I had to increment the HBaseRPCProtocolVersion because of the new parameter.
I'm unsure if this is a "big deal".
-Added a new configuration parameter: hbase.master.regionserver.maxClockSkewMS
and defaulted it to 30 sec (this may be too large).
-Added new exception: ClockOutOfSyncException
-Added TestClockSkewDetection to test the implementation
> 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
> Assignee: Jeff Whiting
> Fix For: 0.90.0
>
> Attachments: HBASE-3168-trunk-v1.txt, HBASE-3168-trunk-v2.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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