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From Frank Luo <j...@merkleinc.com>
Subject RE: HBase poor write performance
Date Tue, 08 Mar 2016 16:49:29 GMT

We have been suffering the issue for two years now without a good solution. From what I learned,
it is not really a good idea to do heavy online hbase puts. The first thing you encounter
will be performance caused by compact no matter how you tune parameters. Then later on you
will see job failures because hbase operation timeouts and/or region server crashes.

Light writes, heavy reads are generally OK.

For heavy puts, the best practice is to prepare tables offline, then turn it on for reads.

If online heavy puts not avoidable, you might get the best out of it if you manage compact/split
by yourself. Meaning when # of files per region reaches certain number, stops writing, performs
 compacts and splits with large regions; then resume writing.

I hope it helps.

Frank Luo

From: Akmal Abbasov [mailto:akmal.abbasov@icloud.com]
Sent: Tuesday, March 08, 2016 10:29 AM
To: user@hbase.apache.org
Subject: HBase poor write performance

I'm testing HBase to choose the right hardware configurations for a heavy write use case.
I'm testing using YCSB.
The cluster consist of 2 masters, and 5 regionservers(4 cores, 14GB ram, 4x512GB SSD).
I've created a new table in HBase, presplit it to 50 regions. I'm running 3 clients each running
50 threads, to insert data.
I'm using the default HBase settings. After running few tests, I can see that the cluster
is underutilized, in fact memory usage is around 30%.
The main problem I see for now is compactions, compactionQueueLength is growing very fast,
and compaction process is always running.
I found that there are hbase.regionserver.thread.compaction.small and hbase.regionserver.thread.compaction.large
but couldn't find information regarding their default values.
I am also planing to increase the regions number and the memstore size to increase utilization
of the cluster and performance.
Which other settings should be tuned to improve both utilization and performance?
Thank you.

I'm using HBase 0.98.7 and regionserver heap size is 7GB.

Regards, Akmal

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