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From Esteban Gutierrez <este...@cloudera.com>
Subject Re: HBase stucks from time to time
Date Wed, 22 Apr 2015 17:42:24 GMT
Hi Serega,

How iostat looks like? are you seeing high utilization (above 60% across
the drives) or long await write times when its writing to the WAL? What
else do you see in the RS logs?

cheers,
esteban.





--
Cloudera, Inc.


On Wed, Apr 22, 2015 at 10:39 AM, Serega Sheypak <serega.sheypak@gmail.com>
wrote:

> Hi, we have 10 nodes cluster running HBase 0.98 CDH 5.2.1
> Sometimes HBase stucks.
> We have several apps constantly writing/reading data from it. Sometimes we
> see that apps response time dramatically increases. It means that app
> spends seconds to read/write from/to HBase. in 99% of time it takes 20ms.
>
> I suppose that compactions/major compactions could be the root cause. I see
> that compactions start at the same time when we have problems with app.
> Could it be so?
> So HBase can't write to WAL because compactions consumes all IO and apps
> stops to write data?
>

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