If someone can share the commandline for running RowCounter, that would be great.
Also, hbase shell count doesn't require column name. Why does RowCounter require it ? Thanks On Thu, Jul 29, 2010 at 4:55 PM, Ryan Rawson <[email protected]> wrote: > Hi, > > That table appears to be empty. Eg: > > 10/07/29 22:38:43 INFO mapred.JobClient: Map input records=0 > > > So back to the count issue... Counting in databases is a classic > problem. Unless your DB system is keeping stats on how many > inserts/deletes and thus how big it thinks the table is, you have to > count all the rows by reading them. HBase is no different, and a > little harder, because we have a variable length data format, so we > can't just estimate row sizes from file sizes. Keeping distributed > stats is not impossible, but certainly not on any priority list to be > implemented - of course JIRAs/patches welcome etc. > > -ryan > > > On Thu, Jul 29, 2010 at 3:48 PM, Ted Yu <[email protected]> wrote: > > We use HBase 0.20.5 > > > > Here is the snippet from RowCounter output: > > > > 10/07/29 22:38:42 DEBUG client.HTable$ClientScanner: Finished with > scanning > > at REGION => {NAME => > > > '2__HB_NOINC_ORCL_SQLLDR_0728-THREEGPPSPEECHCALLS-1280408509541-0,DFF46493EB352D0E31CBFA4652E6EC06,1280412540858', > > STARTKEY => 'DFF46493EB352D0E31CBFA4652E6EC06', ENDKEY => '', ENCODED => > > 1375318608, TABLE => {{NAME => > > '2__HB_NOINC_ORCL_SQLLDR_0728-THREEGPPSPEECHCALLS-1280408509541-0', > FAMILIES > > => [{NAME => 'd', COMPRESSION => 'GZ', VERSIONS => '2', TTL => > '31536000', > > BLOCKSIZE => '65536', IN_MEMORY => 'false', BLOCKCACHE => 'false'}, {NAME > => > > 'i', COMPRESSION => 'GZ', VERSIONS => '2', TTL => '31536000', BLOCKSIZE > => > > '65536', IN_MEMORY => 'false', BLOCKCACHE => 'false'}, {NAME => 'v', > > COMPRESSION => 'GZ', VERSIONS => '2', TTL => '31536000', BLOCKSIZE => > > '65536', IN_MEMORY => 'false', BLOCKCACHE => 'false'}]}} > > 10/07/29 22:38:42 INFO mapred.TaskRunner: > Task:attempt_local_0001_m_000000_0 > > is done. And is in the process of commiting > > 10/07/29 22:38:42 INFO mapred.LocalJobRunner: > > 10/07/29 22:38:42 INFO mapred.TaskRunner: Task > attempt_local_0001_m_000000_0 > > is allowed to commit now > > 10/07/29 22:38:42 INFO mapred.FileOutputCommitter: Saved output of task > > 'attempt_local_0001_m_000000_0' to > > file:/usr/local/hadoop/trunk.80-275066/hbase-0.20.5/rc > > 10/07/29 22:38:42 INFO mapred.LocalJobRunner: > > 10/07/29 22:38:42 INFO mapred.TaskRunner: Task > > 'attempt_local_0001_m_000000_0' done. > > 10/07/29 22:38:43 INFO mapred.JobClient: map 100% reduce 0% > > 10/07/29 22:38:43 INFO mapred.JobClient: Job complete: job_local_0001 > > 10/07/29 22:38:43 INFO mapred.JobClient: Counters: 6 > > 10/07/29 22:38:43 INFO mapred.JobClient: FileSystemCounters > > 10/07/29 22:38:43 INFO mapred.JobClient: FILE_BYTES_READ=1592883 > > 10/07/29 22:38:43 INFO mapred.JobClient: FILE_BYTES_WRITTEN=1624956 > > 10/07/29 22:38:43 INFO mapred.JobClient: Map-Reduce Framework > > 10/07/29 22:38:43 INFO mapred.JobClient: Map input records=0 > > 10/07/29 22:38:43 INFO mapred.JobClient: Spilled Records=0 > > 10/07/29 22:38:43 INFO mapred.JobClient: Map input bytes=0 > > 10/07/29 22:38:43 INFO mapred.JobClient: Map output records=0 > > > > [sjc1-hadoop8.sjc1:hadoop 3705]ls -l > > /usr/local/hadoop/trunk.80-275066/hbase-0.20.5/rc/part-00000 > > -rwxrwxrwx 1 hadoop users 0 Jul 29 22:38 > > /usr/local/hadoop/trunk.80-275066/hbase-0.20.5/rc/part-00000 > > > > But there are many records in the table I was querying. > > > > Can someone comment ? > > > > On Thu, Jul 29, 2010 at 2:26 PM, Jean-Daniel Cryans <[email protected] > >wrote: > > > >> In 0.89 you can specify CACHE for the count command. Set it higher (it > >> defaults to 10 rows per call). > >> > >> Also you can use the RowCounter MR job. > >> > >> J-D > >> > >> On Thu, Jul 29, 2010 at 2:22 PM, Ted Yu <[email protected]> wrote: > >> > Hi, > >> > The count method in HBase shell is quite slow. > >> > Is there a way to obtain count faster ? > >> > > >> > Thanks > >> > > >> > > >
