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From Varun Sharma <va...@pinterest.com>
Subject Re: Balancer switch runs causing problems
Date Tue, 28 Jan 2014 03:51:08 GMT
Actually not sometimes but we are always seeing a large # of .META. reads
every 5 minutes.


On Mon, Jan 27, 2014 at 7:47 PM, Varun Sharma <varun@pinterest.com> wrote:

> The default one with 0.94.7... - I dont see any of those logs. Also we
> turned off the balancer switch - but looks like sometimes we still see a
> large number of requests to .META. table every 5 minutes.
>
> Varun
>
>
> On Mon, Jan 27, 2014 at 7:37 PM, Ted Yu <yuzhihong@gmail.com> wrote:
>
>> In HMaster#balance(), we have (same for 0.94 and 0.96):
>>
>>         for (RegionPlan plan: plans) {
>>           LOG.info("balance " + plan);
>>
>> Do you see such log in master log ?
>>
>>
>> On Mon, Jan 27, 2014 at 7:26 PM, Varun Sharma <varun@pinterest.com>
>> wrote:
>>
>> > We are seeing one other issue with high read latency (p99 etc.) on one
>> of
>> > our read heavy hbase clusters which is correlated with the balancer
>> runs -
>> > every 5 minutes.
>> >
>> > If there is no balancing to do, does the balancer only scan the table
>> every
>> > 5 minutes - does it do anything on top of that if the regions are
>> balanced
>> > ?
>> >
>> > Varun
>> >
>>
>
>

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