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From Saad Mufti <saad.mu...@gmail.com>
Subject Slow sync cost
Date Mon, 25 Apr 2016 19:18:55 GMT

In our large HBase cluster based on CDH 5.5 in AWS, we're constantly seeing
the following messages in the region server logs:

2016-04-25 14:02:55,178 INFO
org.apache.hadoop.hbase.regionserver.wal.FSHLog: Slow sync cost: 258 ms,
current pipeline:

These happen regularly while HBase appear to be operating normally with
decent read and write performance. We do have occasional performance
problems when regions are auto-splitting, and at first I thought this was
related but now I se it happens all the time.

Can someone explain what this means really and should we be concerned? I
tracked down the source code that outputs it in


but after going through the code I think I'd need to know much more about
the code to glean anything from it or the associated JIRA ticket

Also, what is this "pipeline" the ticket and code talks about?

Thanks in advance for any information and/or clarification anyone can



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