You can add them to your hbase-site.xml Cheers
On Fri, Mar 15, 2013 at 5:24 PM, <yulin...@dell.com> wrote: > > Thanks very much Ted for the information. That's very helpful. > > Just wondering if you have any idea where to configure these two values? I > don't see these two parameters in any files under hbase/conf? > > Thanks, > > YuLing > -----Original Message----- > From: Ted Yu [mailto:yuzhih...@gmail.com] > Sent: Friday, March 15, 2013 5:13 PM > To: user@hbase.apache.org > Subject: Re: hbase time skew > > I just realized that if the clock on region server(s) drifts over > relatively long period of time (assuming region server stays up), the > following mechanism wouldn't work. > > FYI > > On Fri, Mar 15, 2013 at 5:07 PM, Ted Yu <yuzhih...@gmail.com> wrote: > > > When a region server reports to master the first time, ServerManager > > does the following check: > > > > * Checks if the clock skew between the server and the master. If > > the clock skew exceeds the > > > > * configured max, it will throw an exception; if it exceeds the > > configured warning threshold, > > > > * it will log a warning but start normally. > > The unit is in milliseconds. > > These two parameters are configurable. > > > > Please take a look at the source code if possible - the code should > > come with tar ball. > > > > Cheers > > > > On Fri, Mar 15, 2013 at 4:50 PM, <yulin...@dell.com> wrote: > > > >> Hi Ted, > >> > >> For the source code below, what's the unit of 30000? Is the maxSkew > >> 30 seconds? Also, what does Hbase do when the time skew exeeds 10 > >> seconds and > >> 30 seconds? Are these two values configurable? > >> > >> Thanks, > >> > >> YuLing > >> >maxSkew = c.getLong("hbase.master.maxclockskew", 30000); > >> > warningSkew = c.getLong("hbase.master.warningclockskew", > >> >10000); > >> >./src/main/java/org/apache/hadoop/hbase/master/ServerManager.java > >> > >> > >> -----Original Message----- > >> From: Ted Yu [mailto:yuzhih...@gmail.com] > >> Sent: Friday, March 15, 2013 4:28 PM > >> To: user@hbase.apache.org > >> Subject: Re: hbase time skew > >> > >> Please upgrade to 0.94.5, if possible. > >> > >> There have been a lot of bug fixes and performance improvements since > >> 0.94.1. > >> > >> On Fri, Mar 15, 2013 at 4:26 PM, <yulin...@dell.com> wrote: > >> > >> > Yes, I'm using 0.94.1. > >> > > >> > -----Original Message----- > >> > From: Ted Yu [mailto:yuzhih...@gmail.com] > >> > Sent: Friday, March 15, 2013 3:53 PM > >> > To: user@hbase.apache.org > >> > Subject: Re: hbase time skew > >> > > >> > Are you using 0.94.x ? > >> > > >> > If so, see the following: > >> > > >> > maxSkew = c.getLong("hbase.master.maxclockskew", 30000); > >> > warningSkew = c.getLong("hbase.master.warningclockskew", > >> > 10000); > >> > ./src/main/java/org/apache/hadoop/hbase/master/ServerManager.java > >> > > >> > Cheers > >> > > >> > On Fri, Mar 15, 2013 at 3:49 PM, <yulin...@dell.com> wrote: > >> > > >> > > Hi, > >> > > > >> > > We recently encountered the issue that HBase tables got into a > >> > > state that was not disabled nor enabled. We found that the root > >> > > cause was the linux clock skewed more than 5 hours. I googled and > >> > > understood that hbase can only handle about a couple of seconds > >> > > time skew. We were wondering if there's any configuration in > >> > > HBase that we can do so as to increase the number of seconds that > hbase could handle? > >> > > > >> > > Thanks very much, > >> > > > >> > > YuLing > >> > > > >> > > >> > > > > >
