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HBase, mail # user - hbase time skew


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Yuling_C@... 2013-03-15, 22:49
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Ted Yu 2013-03-15, 22:53
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Yuling_C@... 2013-03-15, 23:26
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Ted Yu 2013-03-15, 23:28
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Yuling_C@... 2013-03-15, 23:50
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Ted Yu 2013-03-16, 00:07
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Ted Yu 2013-03-16, 00:12
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Yuling_C@... 2013-03-16, 00:24
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Ted Yu 2013-03-16, 00:28
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Michel Segel 2013-03-16, 01:56
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Re: hbase time skew
Kevin O'dell 2013-03-16, 12:48
I am going to agree with Michael on this one.  Don't change the clock
skew, fix it.

On Fri, Mar 15, 2013 at 9:56 PM, Michel Segel <[EMAIL PROTECTED]> wrote:
> Create an ntp server local to the cluster? This will eliminate the skew in the first place.
>
> Sent from a remote device. Please excuse any typos...
>
> Mike Segel
>
> On Mar 15, 2013, at 3:53 PM, Ted Yu <[EMAIL PROTECTED]> wrote:
>
>> Are you using 0.94.x ?
>>
>> If so, see the following:
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>>    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, <[EMAIL PROTECTED]> 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
>>>

--
Kevin O'Dell
Customer Operations Engineer, Cloudera
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Yuling_C@... 2013-03-18, 18:39
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Michel Segel 2013-03-18, 21:29
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Yuling_C@... 2013-03-18, 22:06