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From Ryan Rawson <ryano...@gmail.com>
Subject Re: Help with Map/Reduce program
Date Wed, 10 Jun 2009 23:13:03 GMT
Hey,

A scanner's lease expires in 60 seconds.  I'm not sure what version you are
using, but try:
table.setScannerCaching(1);

This way you won't retrieve 60 rows that each take 1-2 seconds to process.

This is the new default value in 0.20, but I don't know if it ended up in
0.19.x anywhere.


On Wed, Jun 10, 2009 at 2:14 PM, llpind <sonny_heer@hotmail.com> wrote:

>
> Okay, I think I got it figured out.
>
> although when scanning large row keys I do get the following exception:
>
> NativeException: java.lang.RuntimeException:
> org.apache.hadoop.hbase.UnknownScannerException:
> org.apache.hadoop.hbase.UnknownScannerException: -4424757523660246367
>        at
>
> org.apache.hadoop.hbase.regionserver.HRegionServer.close(HRegionServer.java:1745)
>        at sun.reflect.GeneratedMethodAccessor12.invoke(Unknown Source)
>        at
>
> sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
>        at java.lang.reflect.Method.invoke(Method.java:597)
>        at
> org.apache.hadoop.hbase.ipc.HBaseRPC$Server.call(HBaseRPC.java:632)
>        at
> org.apache.hadoop.hbase.ipc.HBaseServer$Handler.run(HBaseServer.java:912)
>
>        from org/apache/hadoop/hbase/client/HTable.java:1741:in `hasNext'
>        from sun/reflect/NativeMethodAccessorImpl.java:-2:in `invoke0'
>        from sun/reflect/NativeMethodAccessorImpl.java:39:in `invoke'
>        from sun/reflect/DelegatingMethodAccessorImpl.java:25:in `invoke'
>        from java/lang/reflect/Method.java:597:in `invoke'
>        from org/jruby/javasupport/JavaMethod.java:298:in
> `invokeWithExceptionHandling'
>        from org/jruby/javasupport/JavaMethod.java:259:in `invoke'
>        from org/jruby/java/invokers/InstanceMethodInvoker.java:36:in `call'
>        from org/jruby/runtime/callsite/CachingCallSite.java:73:in `call'
>        from org/jruby/ast/CallNoArgNode.java:61:in `interpret'
>        from org/jruby/ast/WhileNode.java:124:in `interpret'
>        from org/jruby/ast/NewlineNode.java:101:in `interpret'
>        from org/jruby/ast/BlockNode.java:68:in `interpret'
>        from org/jruby/internal/runtime/methods/DefaultMethod.java:156:in
> `interpretedCall'
>        from org/jruby/internal/runtime/methods/DefaultMethod.java:133:in
> `call'
>        from org/jruby/internal/runtime/methods/DefaultMethod.java:246:in
> `call'
> ... 108 levels...
>        from org/jruby/internal/runtime/methods/DynamicMethod.java:226:in
> `call'
>        from org/jruby/internal/runtime/methods/CompiledMethod.java:216:in
> `call'
>        from org/jruby/internal/runtime/methods/CompiledMethod.java:71:in
> `call'
>        from org/jruby/runtime/callsite/CachingCallSite.java:260:in
> `cacheAndCall'
>        from org/jruby/runtime/callsite/CachingCallSite.java:75:in `call'
>        from home/hadoop/hbase193/bin/$_dot_dot_/bin/hirb.rb:441:in
> `__file__'
>        from home/hadoop/hbase193/bin/$_dot_dot_/bin/hirb.rb:-1:in
> `__file__'
>        from home/hadoop/hbase193/bin/$_dot_dot_/bin/hirb.rb:-1:in `load'
>        from org/jruby/Ruby.java:564:in `runScript'
>        from org/jruby/Ruby.java:467:in `runNormally'
>        from org/jruby/Ruby.java:340:in `runFromMain'
>        from org/jruby/Main.java:214:in `run'
>        from org/jruby/Main.java:100:in `run'
>        from org/jruby/Main.java:84:in `main'
>        from /home/hadoop/hbase193/bin/../bin/hirb.rb:346:in `scan'
>
>
> ===================================================
>
> Is there an easy way around this problem?
>
>
>
>
> Billy Pearson-2 wrote:
> >
> > Yes that's what scanners are good for they will return all the
> > columns:lables combos for a row
> > What does the MR job stats say for rows processed for the maps and
> > reduces?
> >
> > Billy Pearson
> >
> >
> >
> > "llpind" <sonny_heer@hotmail.com> wrote in
> > message news:23967196.post@talk.nabble.com...
> >>
> >> also,
> >>
> >> I think what we want is a way to wildcard everything after colFam1:
> >> (e.g.
> >> colFam1:*).  Is there a way to do this in HBase?
> >>
> >> This is assuming we dont know the column name, we want them all.
> >>
> >>
> >> llpind wrote:
> >>>
> >>> Thanks.
> >>>
> >>> Yea I've got that colFam for sure in the HBase table:
> >>>
> >>> {NAME => 'tableA', FAMILIES => [{NAME => 'colFam1', VERSIONS =>
'3',
> >>> COMPRESSION => 'NONE', LENGTH => '2147483647',
> >>>  TTL => '-1', IN_MEMORY => 'false', BLOCKCACHE => 'false'}, {NAME
=>
> >>> 'colFam2', VERSIONS => '3', COMPRESSION =>
> >>>  'NONE', LENGTH => '2147483647', TTL => '-1', IN_MEMORY => 'false',
> >>> BLOCKCACHE => 'false'}]}
> >>>
> >>>
> >>> I've been trying to play with rowcounter, and not having much luck
> >>> either.
> >>>
> >>> I run the command:
> >>> hadoop19/bin/hadoop org.apache.hadoop.hbase.mapred.Driver rowcounter
> >>> /home/hadoop/dev/rowcounter7 tableA colFam1:
> >>>
> >>>
> >>> The map/reduce finishes just like it does with my own program, but with
> >>> all part files empty in /home/hadoop/dev/rowcounter7.
> >>>
> >>> Any Ideas?
> >>>
> >>>
> >>
> >> --
> >> View this message in context:
> >>
> http://www.nabble.com/Help-with-Map-Reduce-program-tp23952252p23967196.html
> >> Sent from the HBase User mailing list archive at Nabble.com.
> >>
> >>
> >
> >
> >
> >
>
> --
> View this message in context:
> http://www.nabble.com/Help-with-Map-Reduce-program-tp23952252p23971190.html
> Sent from the HBase User mailing list archive at Nabble.com.
>
>

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