I have tried 0.20.4 and it behaves the same way. Finally, I am back to 0.20.1, and it works fine.
Thanks Karthik On Wed, Jul 21, 2010 at 10:43 AM, Karthik Kambatla <[email protected]>wrote: > Thanks a lot for the prompt help. [I had sent an immediate reply but from > the wrong address... hopefully, you would receive this.] > > > I am running HBase 0.20.5. I have cleaned the whole cluster and re-setup > everything (HDFS, MapReduce, and HBase). Here is the transcript -- from when > the HBase cluster has been started. > > > [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 > 0 row(s) in 0.0910 seconds > > hbase(main):002:0> create 'Test' > 0 row(s) in 1.0990 seconds > > hbase(main):003:0> list > Test > > > 1 row(s) in 0.0070 seconds > > hbase(main):004:0> 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 > 0 row(s) in 0.0860 seconds > > hbase(main):004:0> scan '.META.' > ROW > COLUMN+CELL > > Test,,1279665697803 column=info:server, timestamp=1279668781099, > value=15.25.119.96:60020 > Test,,1279665697803 column=info:serverstartcode, > timestamp=1279668781099, value=1279665651801 > 1 row(s) in 0.0260 seconds > > hbase(main):005:0> create 'Test1' > 0 row(s) in 1.1050 seconds > > hbase(main):006:0> list > 0 row(s) in 0.0060 seconds > > hbase(main):007:0> scan '.META.' > ROW > COLUMN+CELL > > Test,,1279665697803 column=info:server, timestamp=1279668781099, > value=15.25.119.96:60020 > Test,,1279665697803 column=info:serverstartcode, > timestamp=1279668781099, value=1279665651801 > 1 row(s) in 0.0100 seconds > > hbase(main):008:0> 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 > 0 row(s) in 0.0900 seconds > > hbase(main):002:0> scan '.META.' > ROW > COLUMN+CELL > > 0 row(s) in 0.0130 seconds > > hbase(main):003:0> scan '.META.' > ROW > COLUMN+CELL > > 0 row(s) in 0.0070 seconds > > Thanks > Karthik > > > On Tue, Jul 20, 2010 at 4:15 PM, Jonathan Gray <[email protected]> wrote: > >> Also, I'm not sure this will be fixed with the master changes. >> >> tableExists() actually makes a call to listTables() and then checks if the >> table you are looking for is in the list. >> >> listTables() uses a MetaScanner/MetaVisitor. Though the master changes >> de-emphasize the general use of meta scanning, it would not necessarily >> change the implementation of these client (to RS) calls. >> >> Hard to say what would make this flakey besides some of the older bugs >> around lots of META StoreFiles. >> >> What version of HBase are you running? >> >> JG >> >> > -----Original Message----- >> > From: Jonathan Gray [mailto:[email protected]] >> > Sent: Tuesday, July 20, 2010 4:06 PM >> > To: [email protected] >> > Subject: RE: Flaky tableExists() >> > >> > 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 >> > > > > >> > > > >> > >
