Looking at this exception, can you check namenode log to see when / who the file was removed ?
1. Caused by: java.io.IOException: java.io.FileNotFoundException: File does not exist: /apps/hbase/data/data/default/E_MP_DAY_READ_20140315/603cefeda4cfc679c41d1896ceb30518/info/028214f3248f4989b731e268102ff72e On Wed, Apr 16, 2014 at 10:27 PM, Tao Xiao <xiaotao.cs....@gmail.com> wrote: > Take the region > E_MP_DAY_READ_20140315,,1396363260513.6886ac98a71a47dc78a9e0ab5b3f07cd for > example. > > I checked the master's log and the region server (*b05.jsepc.com > <http://b05.jsepc.com>*) log, and found that in the master log there are > just 4 logging lines about that region and the logging time was as early as > 2014-04-02. > > In the region server's log, there are more logging lines about that region, > but the logging time is quite recent, say 2014-04-16. It seems that the > master has lost control of that region for a long time, but the region > server is still managing that region although it cannot open it. > > The master log is here <http://pastebin.com/6J6v9tSg>, and the region > server log is here <http://pastebin.com/fbuu0RpC>. > > > 2014-04-17 9:34 GMT+08:00 Ted Yu <yuzhih...@gmail.com>: > > > You can pick a region which is stuck in transition, find which region > > server is hosting it and search region server log on that server. > > > > By correlating events from master and region server logs, you should see > > what is happening. > > > > > > On Wed, Apr 16, 2014 at 6:24 PM, Tao Xiao <xiaotao.cs....@gmail.com> > > wrote: > > > > > Actually, open that link and then click on the picture, it will zoom in > > and > > > become quite clear. > > > > > > I checked the HMaster UI just now and I am sure that these regions are > > > always in transition, I suppose there would be some exceptions > > happening. > > > How to prevent regions from being in transition for a long time ? > > > > > > > > > 2014-04-17 9:00 GMT+08:00 Ted Yu <yuzhih...@gmail.com>: > > > > > > > The picture is not very clear. > > > > I don't see E_MP_DAY_READ having regions in transition. > > > > > > > > Anyway, as long as there is region in transition, balancer would not > > run. > > > > > > > > Cheers > > > > > > > > > > > > On Wed, Apr 16, 2014 at 5:52 PM, Tao Xiao <xiaotao.cs....@gmail.com> > > > > wrote: > > > > > > > > > Ted, > > > > > > > > > > I can see some regions of other tables in transition now , but I'm > > not > > > > sure > > > > > how long have them been in transition and I will check the HBase > > master > > > > UI > > > > > later. Here is the > > > > > screenshot< > > > > > > > > > > > > > > > http://picpaste.com/Regions_in_Transition_-_2014-04-17_08-38-qyf5anz8.png > > > > > >. > > > > > From the screenshot, there is a region with state of FAILED_OPEN, > > which > > > > is > > > > > in red, and there are 9 regions in transition for more than 60 > > seconds. > > > > > > > > > > Note that the table whose regions all stay in 2 nodes is > > E_MP_DAY_READ, > > > > > while the other tables shown in the screenshot are named as > > > > > E_MP_DAY_READ_20140315, E_MP_DAY_READ_20140322, > > E_MP_DAY_READ_20140324, > > > > and > > > > > so on. > > > > > > > > > > Thanks. > > > > > > > > > > > > > > > 2014-04-16 23:10 GMT+08:00 Ted Yu <yuzhih...@gmail.com>: > > > > > > > > > > > bq. found some regions of other tables in transition, not of this > > > > table. > > > > > > > > > > > > That can explain why "balancer" command returned false. > > > > > > Are those regions stuck in transition ? > > > > > > > > > > > > Cheers > > > > > > > > > > > > > > > > > > On Tue, Apr 15, 2014 at 10:47 PM, Tao Xiao < > > xiaotao.cs....@gmail.com > > > > > > > > > > wrote: > > > > > > > > > > > > > The command "balance_switch true" returns true, but the command > > > > > > "balancer" > > > > > > > returns false. I checked the HMaster UI and found some regions > of > > > > other > > > > > > > tables in transition, not of this table. > > > > > > > > > > > > > > This table's name is E_MP_DAY_READ, I did grep it in the master > > log > > > > and > > > > > > > found only the following lines: > > > > > > > > > > > > > > 2014-04-15 15:50:59,925 INFO > > > [MASTER_SERVER_OPERATIONS-b03:60000-1] > > > > > > > handler.ServerShutdownHandler: Skip assigning region > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > E_MP_DAY_READ,160001123745_2014-01-25:00:00:00,1395753408476.ba5c8291f8dad37d5b9621b7334c17b0. > > > > > > > because it has been opened in a04.jsepc.com > ,60020,1397548219084 > > > > > > > 2014-04-15 15:50:59,926 INFO > > > [MASTER_SERVER_OPERATIONS-b03:60000-1] > > > > > > > handler.ServerShutdownHandler: Skip assigning region > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > E_MP_DAY_READ,300007915618_2014-03-13:00:00:00,1395994146202.ec4e397baffd1cc40bdc18ce0ab2f28a. > > > > > > > because it has been opened in a04.jsepc.com > ,60020,1397548219084 > > > > > > > 2014-04-15 15:50:59,926 INFO > > > [MASTER_SERVER_OPERATIONS-b03:60000-1] > > > > > > > handler.ServerShutdownHandler: Skip assigning region > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > E_MP_DAY_READ,300013608840_2014-02-21:00:00:00,1395749573711.744bab52befec279a7ee97497801e10f. > > > > > > > because it has been opened in a04.jsepc.com > ,60020,1397548219084 > > > > > > > 2014-04-15 15:50:59,937 INFO > > > [MASTER_SERVER_OPERATIONS-b03:60000-2] > > > > > > > handler.ServerShutdownHandler: Skip assigning region > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > E_MP_DAY_READ,300000497780_2014-01-23:00:00:00,1395746363941.79b831e698053b1005f7a97c9f2a6ddc. > > > > > > > because it has been opened in a04.jsepc.com > ,60020,1397548219084 > > > > > > > 2014-04-15 15:50:59,938 INFO > > > [MASTER_SERVER_OPERATIONS-b03:60000-2] > > > > > > > handler.ServerShutdownHandler: Skip assigning region > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > E_MP_DAY_READ,300008188567_2014-03-04:00:00:00,1395756104426.eb1806c2dc5833152b6b5e7b5e4a88b8. > > > > > > > because it has been opened in a04.jsepc.com > ,60020,1397548219084 > > > > > > > 2014-04-15 15:50:59,940 INFO > > > [MASTER_SERVER_OPERATIONS-b03:60000-2] > > > > > > > handler.ServerShutdownHandler: Skip assigning region > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > E_MP_DAY_READ,300016987143_2014-01-21:00:00:00,1395986789897.e4d143865d354bdc2a427c1f00df6ad7. > > > > > > > because it has been opened in a04.jsepc.com > ,60020,1397548219084 > > > > > > > > > > > > > > so few logging lines about it, looks strange ? > > > > > > > > > > > > > > > > > > > > > BTW, I can spread the regions of this table evenly across the > > whole > > > > > > cluster > > > > > > > after I shutdown the two region servers where the regions of > this > > > > table > > > > > > > resided originally. > > > > > > > > > > > > > > > > > > > > > 2014-04-15 19:47 GMT+08:00 Ted Yu <yuzhih...@gmail.com>: > > > > > > > > > > > > > > > Is load balancer enabled ? > > > > > > > > > > > > > > > > Can you grep this table in master log and pastebin what you > > > found ? > > > > > > > > > > > > > > > > Cheers > > > > > > > > > > > > > > > > On Apr 15, 2014, at 4:40 AM, Tao Xiao < > > xiaotao.cs....@gmail.com> > > > > > > wrote: > > > > > > > > > > > > > > > > > I am using HDP 2.0.6, which has 18 nodes(region servers). > One > > > of > > > > my > > > > > > > HBase > > > > > > > > > tables has 50 regions but I found that the 50 regions all > > stay > > > in > > > > > > just > > > > > > > > two > > > > > > > > > nodes, not spread evenly in the 18 nodes. I did not > > pre-create > > > > > splits > > > > > > > so > > > > > > > > > this table was gradually split into 50 regions itself. > > > > > > > > > > > > > > > > > > I'd like to know why all the regions stay in just two > nodes, > > > not > > > > > the > > > > > > 18 > > > > > > > > > nodes of the cluster, and how to spread the regions evenly > > > across > > > > > all > > > > > > > the > > > > > > > > > region servers. Thanks. > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > >
