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From Mark Tse <Mark....@D2L.com>
Subject Can adding additional DataNodes / RegionServers cause a spike in RegionServer requests?
Date Wed, 31 Aug 2016 14:37:51 GMT
I have an HBase cluster with 4 RegionServers that was serving ~3600 requests per second. After
adding two RegionServers / DataNodes at once, two of the pre-existing RegionServers went up
to ~55000 and ~96000 requests per second, and totaling about ~153000 requests per second across
all 6 RegionServers. The newly added RegionServers had the lowest requests per second.

After leaving it overnight, the total number of requests has gone back down to ~3600 requests
per second across all 6 RegionServers. As well, HDFS has distributed the blocks evenly so
that the new DataNodes now host a similar amount of blocks as the pre-existing DataNodes.

Not sure if relevant, but the "hbase:meta" table regions was not hosted on one of the RegionServers
that had the spike in requests per second.

Is it normal behaviour for existing RegionServers to have to work harder when new RegionServers
come online? If so, what is the reason for the (massive) increase?

Thanks,
Mark


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