I've personally never seen a flaky tableExists() but it's not something I've used heavily.
Could you do the same operations you did below in the shell but also run: scan '.META.' > -----Original Message----- > From: Karthik Kambatla [mailto:[email protected]] > Sent: Tuesday, July 20, 2010 3:26 PM > To: [email protected] > Subject: Re: Flaky tableExists() > > Thanks Ryan for understanding the pain :) > > Is there a work-around for the time being? I haven't experienced any > such > issues with earlier versions of HBase. Was I just lucky or would it > make > sense to revert to earlier questions? > > Thanks > Karthik > > On Tue, Jul 20, 2010 at 2:54 PM, Ryan Rawson <[email protected]> > wrote: > > > This sucks, and there are being substantial reworks to master > > functions in 0.90 :-) > > > > Hopefully that will permanently address these kinds of bugs. > > > > Hopefully within a few weeks there'll be a developer preview (0.89 > > series) that has that code. > > > > -ryan > > > > On Tue, Jul 20, 2010 at 2:52 PM, Karthik Kambatla > > <[email protected]> wrote: > > > Hi all > > > > > > I have been noticing a slightly flaky behavior with respect to > > > HBaseAdmin.tableExists(). After I have created the table, it > returns > > > true/false every time when called. In hbase shell, the list command > > prints > > > out all the tables sometimes, and shows no tables on other > occasions. Any > > > ideas as to why this happens? > > > > > > The master on my cluster runs the HDFS - namenode, secondary > namenode; > > HBase > > > - HMaster, HQuorumPeer. The 12 slaves run the HDFS datanode and > HBase > > > HRegionServer. Below is the transcript of operations on hbase > shell... > > Every > > > time I exit and enter hbase shell, the output changes. > > > > > > Thanks > > > Karthik > > > > > > hbase(main):002:0> count 'SUBSCRIPTIONS' > > > 0 row(s) in 6.0560 seconds > > > hbase(main):003:0> create 'Test' > > > 0 row(s) in 1.0840 seconds > > > hbase(main):004:0> list > > > SUBSCRIPTIONS > > > > > > > > > 1 row(s) in 0.0090 seconds > > > > > > hbase(main):010:0> create 'Test' > > > NativeException: org.apache.hadoop.hbase.TableExistsException: > > > org.apache.hadoop.hbase.TableExistsException: Test > > > at > > org.apache.hadoop.hbase.master.HMaster.createTable(HMaster.java:798) > > > at > > org.apache.hadoop.hbase.master.HMaster.createTable(HMaster.java:762) > > > at sun.reflect.GeneratedMethodAccessor13.invoke(Unknown Source) > > > at > > > > > > sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccesso > rImpl.java:25) > > > at java.lang.reflect.Method.invoke(Method.java:597) > > > at > org.apache.hadoop.hbase.ipc.HBaseRPC$Server.call(HBaseRPC.java:657) > > > at > > > > org.apache.hadoop.hbase.ipc.HBaseServer$Handler.run(HBaseServer.java:91 > 5) > > > > > > > > > hbase(main):011:0> list > > > SUBSCRIPTIONS > > > > > > 1 row(s) in 0.0070 seconds > > > hbase(main):012:0> exit > > > > > > [kamba...@mercado-2 ~]$ hbase shell > > > HBase Shell; enter 'help<RETURN>' for list of supported commands. > > > Version: 0.20.5, rUnknown, Thu Jul 15 22:27:05 PDT 2010 > > > hbase(main):001:0> list > > > TOPICS > > > > > > Test > > > > > > TestTable > > > > > > USERS > > > > > > 4 row(s) in 0.0930 seconds > > > hbase(main):005:0> exit > > > > > > [kamba...@mercado-2 ~]$ hbase shell > > > HBase Shell; enter 'help<RETURN>' for list of supported commands. > > > Version: 0.20.5, rUnknown, Thu Jul 15 22:27:05 PDT 2010 > > > hbase(main):001:0> list > > > EVENTS > > > > > > SUBSCRIPTIONS > > > > > > TOPICS > > > > > > TestTable > > > > > > USERS > > > > > > 5 row(s) in 0.1000 seconds > > > > >
