Hi, Thanks for the help.
I am going forward with writing my own filter - but having some trouble running it. What I did was simply copied SingleValueColumnFilter, renamed it, and ran. But I got... Exception in thread "main" org.apache.hadoop.hbase.client.RetriesExhaustedException: Failed after attempts=10, exceptions: Thu Nov 01 11:18:29 PDT 2012, org.apache.hadoop.hbase.client.ScannerCallable@2be2befa, java.io.IOException: IPC server unable to read call parameters: Error in readFields Thu Nov 01 11:18:30 PDT 2012, org.apache.hadoop.hbase.client.ScannerCallable@2be2befa, java.io.IOException: IPC server unable to read call parameters: Error in readFields Thu Nov 01 11:18:31 PDT 2012, org.apache.hadoop.hbase.client.ScannerCallable@2be2befa, java.io.IOException: IPC server unable to read call parameters: Error in readFields Here is how I run it... java -cp Graph/bin:$HADOOP_CLASSPATH test This runs fine when I use SingleColumnValueFilter, but I get the above error messages when I use my copy of that class. Maybe I am not running this correctly? Thanks, Jon On Wed, Oct 31, 2012 at 11:38 PM, Anoop John <[email protected]> wrote: > You have one CF such that all rows will have KVs for that CF? > You need to implement your own filter. > Your scan can select the above CF and the on which u need the filtering. > Have a look at the QualifierFilter.. similar approach you might need to do > in the new filter.. Good luck :) > > -Anoop- > > On Thu, Nov 1, 2012 at 8:08 AM, anil gupta <[email protected]> wrote: > > > Hi Jonathan, > > > > Then in that case SingleColumnValueFilter will not work. > > SingleColumnValueFilter works on the value of a cell rather than > > ColumnQualifier name. > > I have never heard of a built-in filter in HBase which can give you are > all > > rows where a certain column family does not have any column qualifier. > > > > You can have a look at QualifierFilter: > > > > > http://hbase.apache.org/apidocs/org/apache/hadoop/hbase/filter/QualifierFilter.html > > . > > If QualifierFilter does suffices then you might have to implement by your > > own. > > > > HTH, > > Anil > > > > On Wed, Oct 31, 2012 at 4:07 PM, Jonathan Bishop <[email protected] > > >wrote: > > > > > When I created the table I created column families, one of which is say > > > "xyz". > > > > > > Now I would like to find all rows for which "xyz" is empty - in other > > words > > > no puts were made to that column family for that row. > > > > > > My column qualifiers are all "". > > > > > > > > > On Wed, Oct 31, 2012 at 3:22 PM, anil gupta <[email protected]> > > wrote: > > > > > > > Hi Jonathan, > > > > > > > > Do you mean that cell value is ""? or column qualifier is ""? I am > > > confused > > > > by your description. > > > > If you were talking about cell value, at the time of put which object > > do > > > > you use for cell value? String? > > > > > > > > Thanks, > > > > Anil > > > > > > > > On Wed, Oct 31, 2012 at 2:49 PM, Jonathan Bishop < > > [email protected] > > > > >wrote: > > > > > > > > > Hi, > > > > > > > > > > I am trying to use SingleColumnValueFilter to find only those rows > > > which > > > > > have a particular column which is empty. Not sure what to use for > the > > > > value > > > > > (4th arg in const). It does not take null, and I tried something > > > like... > > > > > > > > > > byte[] v = new byte[0]; > > > > > > > > > > but that does not seem to work. > > > > > > > > > > Thanks, > > > > > > > > > > Jon > > > > > > > > > > > > > > > > > > > > > -- > > > > Thanks & Regards, > > > > Anil Gupta > > > > > > > > > > > > > > > -- > > Thanks & Regards, > > Anil Gupta > > >
