huaxiangsun opened a new pull request #2570:
URL: https://github.com/apache/hbase/pull/2570
… load over meta replica regions
It adds load balance support. With "hbase.meta.replicas.use" set to true,
client support meta replica feature.
The existing mode is called HighAvailable, client sends scan request to the
primary meta replica region first,
if response is not back within a configured amount of time, it will send
scan requests to all meta replica regions and
take the first response. On top of the existing mode, a new mode LoadBalance
is added. In this mode, client first
choose a meta replica region to send scan request. If the response is stale,
it will send the scan request to the primary
meta region. In this mode, all meta replica regions serve scan requests.
Two new config knobs are added:
1. hbase.meta.replicas.mode
Valid value is "HighAvailable" and "LoadBalance".
2. hbase.meta.replicas.mode.loadbalance.replica.chooser
Implementation class for MetaReplicaChooser. Only
org.apache.hadoop.hbase.client.MetaReplicaLoadBalanceReplicaSimpleChooser.class
is supported for now, which is the default as well.
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