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From Jean-Marc Spaggiari <jean-m...@spaggiari.org>
Subject Re: HBase stucks from time to time
Date Wed, 22 Apr 2015 17:42:05 GMT
Hi Serega, can also be because of garbage collection.

Can you share the logs around the time this occurs?

Compacting regions will not block HBase to get writes and to write in the
WAL. But might impact your storage system regarding IOs.

JM

2015-04-22 13:39 GMT-04:00 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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