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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?


Cloudera, Inc.

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

> 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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