Hbase Region迁移过程详解

来源：互联网发布：金方绿方知乎编辑：程序博客网时间：2024/06/05 08:54

在生产上遇到有比较大的Region都是运行在同一个RegionSever上，有些RegionSever上的Requests比较少，明显的出现读请求不均衡；这个时候我们可以手动的移动Region到负载比较低的RegionSever上面

eg:
在hbase shell 执行如下：move ‘5f1e66c635f8a0ed278f609fa16d5a6e’,’slave2,16020,1507799449330’

通过查看查看日志发现迁移的过程如下：

最开始school表的region在RegionServer slave1上面，迁移到RegionServer slave2中；过程如下

1.RegionSever slave1中的state=open然后状态变为PENDING_CLOSE，此时ZK中把此region标记为
OFFLINED （Setting node as OFFLINED in ZooKeeper for region）

2.RegionSever slave1中的state此时的状态标记为OFFLINE

3.RegionSever slave2此时的状态为state= PENDING_OPEN，然后状态边为OPENING

4.通知master.RegionStates此时RegionSever slave1中的region已经Offlined

017-10-13 11:25:24,257 INFO  [RpcServer.FifoWFPBQ.default.handler=29,queue=2,port=16000] master.HMaster: Client=root/null move hri=school,,1507859275853.5f1e66c635f8a0ed278f609fa16d5a6e., src=slave1,16020,1507799439679, dest=slave2,16020,1507799449330, running balancer2017-10-13 11:25:24,262 INFO  [RpcServer.FifoWFPBQ.default.handler=29,queue=2,port=16000] master.RegionStates: Transition {**5f1e66c635f8a0ed278f609fa16d5a6e** state=**OPEN**, ts=1507864380924, server=slave1,16020,1507799439679} to {5f1e66c635f8a0ed278f609fa16d5a6e state=PENDING_CLOSE, ts=1507865124262, server=slave1,16020,1507799439679}2017-10-13 11:25:24,295 INFO  [AM.ZK.Worker-pool2-t61] master.RegionStates: Transition {5f1e66c635f8a0ed278f609fa16d5a6e state=**PENDING_CLOSE**, ts=1507865124262, server=slave1,16020,1507799439679} to {5f1e66c635f8a0ed278f609fa16d5a6e state=CLOSED, ts=1507865124295, server=slave1,16020,1507799439679}2017-10-13 11:25:24,295 INFO  [AM.ZK.Worker-pool2-t61] master.AssignmentManager: **Setting node as OFFLINED in ZooKeeper for region** {ENCODED => 5f1e66c635f8a0ed278f609fa16d5a6e, NAME => 'school,,1507859275853.5f1e66c635f8a0ed278f609fa16d5a6e.', STARTKEY => '', ENDKEY => ''}2017-10-13 11:25:24,295 INFO  [AM.ZK.Worker-pool2-t61] master.RegionStates: Transition {5f1e66c635f8a0ed278f609fa16d5a6e state=CLOSED, ts=1507865124295, server=slave1,16020,1507799439679} to {5f1e66c635f8a0ed278f609fa16d5a6e state=OFFLINE, ts=1507865124295, server=slave1,16020,1507799439679}2017-10-13 11:25:24,298 INFO  [AM.ZK.Worker-pool2-t61] master.AssignmentManager: Assigning school,,1507859275853.5f1e66c635f8a0ed278f609fa16d5a6e. to slave2,16020,15077994493302017-10-13 11:25:24,298 INFO  [AM.ZK.Worker-pool2-t61] master.RegionStates: Transition {5f1e66c635f8a0ed278f609fa16d5a6e state=OFFLINE, ts=1507865124295, server=slave1,16020,1507799439679} to {5f1e66c635f8a0ed278f609fa16d5a6e state=PENDING_OPEN, ts=1507865124298, server=slave2,16020,1507799449330}2017-10-13 11:25:24,310 INFO  [AM.ZK.Worker-pool2-t63] master.RegionStates: Transition {5f1e66c635f8a0ed278f609fa16d5a6e state=PENDING_OPEN, ts=1507865124298, server=slave2,16020,1507799449330} to {5f1e66c635f8a0ed278f609fa16d5a6e state=OPENING, ts=1507865124310, server=slave2,16020,1507799449330}2017-10-13 11:25:24,384 INFO  [AM.ZK.Worker-pool2-t64] master.RegionStates: Transition {5f1e66c635f8a0ed278f609fa16d5a6e state=OPENING, ts=1507865124310, server=slave2,16020,1507799449330} to {5f1e66c635f8a0ed278f609fa16d5a6e state=OPEN, ts=1507865124384, server=slave2,16020,1507799449330}2017-10-13 11:25:24,387 INFO  [AM.ZK.Worker-pool2-t66] master.RegionStates: Offlined 5f1e66c635f8a0ed278f609fa16d5a6e from slave1,16020,1507799439679

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