Sanity date and time check when a region server joins the cluster
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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
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}
JG suggests we add a "ClockOutOfSync-like exception"
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