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From Tao Xiao <xiaotao.cs....@gmail.com>
Subject Re: All regions stay on two nodes out of 18 nodes
Date Thu, 17 Apr 2014 00:52:50 GMT
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 <yuzhihong@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.nju@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 <yuzhihong@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.nju@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.
> > >
> >
>

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