I feel like I'm missing too much information to be helpful, for example when the standby master comes up it needs to 13134 RIT. What happened there? I thought the regions were all assigned? What happened to the first master? How come 1306205940117 whent from 5841 regions to 0?
Thx for filling the gaps, J-D On Thu, Jun 23, 2011 at 6:35 PM, bijieshan <[email protected]> wrote: > Hi, > > I found the problem while the cluster couldn't balance. One node's regions > count is the double of the other nodes. And it didn't move regions anymore: > Address Start Code Load > 158-1-101-202:20030 1306205409671 requests=0, regions=2593, usedHeap=114, > maxHeap=8165 > 158-1-101-222:20030 1306205940117 requests=0, regions=5841, usedHeap=80, > maxHeap=8165 > 158-1-101-52:20030 1306205417261 requests=0, regions=2622, usedHeap=76, > maxHeap=8165 > 158-1-101-82:20030 1306205415714 requests=0, regions=2633, usedHeap=69, > maxHeap=8165 > Total: servers: 4 requests=0, regions=13689 > > > HBASE-3985-"Same Region could be picked out twice in LoadBalancer" was found > by my analysis on this problem. > But I'm afraid it's not the main cause of the problem. > > There's one active master, one standby master, four regionservers in our > cluster. > >>>10:57:41, the standby hamster 222 becomes the active one. > 2011-05-24 10:57:41,314 INFO org.apache.hadoop.hbase.master.HMaster: Master > startup proceeding: master failover > >>>4 regionservers was registered in 222 one by one. Only one regionserver >>>seemed some time late. > 2011-05-24 10:57:37,533 INFO : Registering > server=158-1-101-82,20020,1306205415714, regionCount=3388, userLoad=true > 2011-05-24 10:57:37,537 INFO : Registering > server=158-1-101-202,20020,1306205409671, regionCount=3453, userLoad=true > 2011-05-24 10:57:37,598 INFO : Registering > server=158-1-101-52,20020,1306205417261, regionCount=3411, userLoad=true > 2011-05-24 10:59:00,408 INFO : Registering > server=158-1-101-222,20020,1306205940117, regionCount=0, userLoad=false > >>>13134 regions needed to move after rebuildUserRegions(13689 regions in the >>>cluster during the time). > 2011-05-24 10:58:47,534 INFO > org.apache.hadoop.hbase.master.AssignmentManager: Failed-over master needs to > process 13134 regions in transition > >>>All the 13134 regions were opened, regions opened count in each server: > 158-1-101-222,20020,1306205940117 Count: 834 > 158-1-101-82,20020,1306205415714 Count: 4093 > 158-1-101-202,20020,1306205409671 Count: 4118 > 158-1-101-52,20020,1306205417261 Count: 4089 > >>>The nearest balancer calculate results: > 2011-05-24 11:12:11,076 INFO org.apache.hadoop.hbase.master.LoadBalancer: > Calculated a load balance in 19ms. Moving 5012 regions off of 3 overloaded > servers onto 1 less loaded servers > > "5012" is an unimaginable number here, for it is larger than the average > number "3424.5" > > > Jieshan Bean > > >
