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From Julian Wissmann <julian.wissm...@sdace.de>
Subject Re: BigDecimalColumnInterpreter
Date Wed, 05 Sep 2012 20:30:11 GMT
Thank you!
So this looks like the missing link here.
I'll see if I can get it working, tomorrow morning.

Cheers

2012/9/5 Ted Yu <yuzhihong@gmail.com>

> I added one review comment on
> HBASE-6669<https://issues.apache.org/jira/browse/HBASE-6669>
> .
>
> Thanks Julian for reminding me.
>
> On Wed, Sep 5, 2012 at 12:49 PM, Julian Wissmann
> <julian.wissmann@sdace.de>wrote:
>
> > I get supplied with doubles from sensors, but in the end I loose too much
> > precision if I do my aggregations on double, otherwise I'd go for it.
> > I use 0.92.1, from Cloudera CDH4.
> > I've done some initial testing with LongColumnInterpreter on a dataset
> that
> > I've generated, to do some testing and get accustomed to stuff, but that
> > worked like a charm after some initial stupidity on my side.
> > So now I'm trying to do some testing with the real data, which comes in
> as
> > double and gets parsed to BigDecimal before writing.
> >
> > 2012/9/5 Ted Yu <yuzhihong@gmail.com>
> >
> > > And your HBase version is ?
> > >
> > > Since you use Double.parseDouble(), looks like it would be more
> efficient
> > > to develop DoubleColumnInterpreter.
> > >
> > > On Wed, Sep 5, 2012 at 12:07 PM, Julian Wissmann
> > > <julian.wissmann@sdace.de>wrote:
> > >
> > > > Hi,
> > > > the schema looks like this:
> > > > RowKey: id,timerange_timestamp,offset (String)
> > > > Qualifier: Offset (long)
> > > > Timestamp: timestamp (long)
> > > > Value:number (BigDecimal)
> > > >
> > > > Or as code when I read data from csv:byte[] value =
> > > > Bytes.toBytes(BigDecimal.valueOf(Double.parseDouble(cData[2])));
> > > >
> > > > Cheers,
> > > >
> > > > Julian
> > > >
> > > > 2012/9/5 Ted Yu <yuzhihong@gmail.com>
> > > >
> > > > > You haven't told us the schema of your table yet.
> > > > > Your table should have column whose value can be interpreted by
> > > > > BigDecimalColumnInterpreter.
> > > > >
> > > > > Cheers
> > > > >
> > > > > On Wed, Sep 5, 2012 at 9:17 AM, Julian Wissmann <
> > > > julian.wissmann@sdace.de
> > > > > >wrote:
> > > > >
> > > > > > Hi,
> > > > > >
> > > > > > I am currently experimenting with the BigDecimalColumnInterpreter
> > > from
> > > > > > https://issues.apache.org/jira/browse/HBASE-6669.
> > > > > >
> > > > > > I was thinking the best way for me to work with it would be
to
> use
> > > the
> > > > > Java
> > > > > > class and just use that as is.
> > > > > >
> > > > > > Imported it into my project and tried to work with it as is,
by
> > just
> > > > > > instantiating the ColumnInterpreter as
> BigDecimalColumnInterpreter.
> > > > Okay,
> > > > > > threw errors and also complained about not knowing where to
find
> > > such a
> > > > > > class.
> > > > > >
> > > > > > So I did some reading and found out, that I'd need to have an
> > > Endpoint
> > > > > for
> > > > > > it. So I imported AggregateImplementation and AggregateProtocol
> > into
> > > my
> > > > > > workspace, renamed them, and refactored them where necessary
to
> > take
> > > > > > BigDecimal. Re-exported the jar, then and had another try.
> > > > > >
> > > > > > So when I call:
> > > > > > ------
> > > > > > final Scan scan = new Scan((metricID + "," +
> > > > basetime_begin).getBytes(),
> > > > > > (metricID + "," + basetime_end).getBytes());
> > > > > > scan.addFamily(family.getBytes());
> > > > > > final ColumnInterpreter<BigDecimal, BigDecimal> ci = new
> > > > > > BigDecimalColumnInterpreter();
> > > > > > Map<byte[], BigDecimal> results =
> > > > > > table.coprocessorExec(BigDecimalProtocol.class, null, null,
> > > > > >     new Batch.Call<BigDecimalProtocol,BigDecimal>() {
> > > > > >       public BigDecimal call(BigDecimalProtocol instance)throws
> > > > > > IOException{
> > > > > >         return instance.getMax(ci, scan);
> > > > > >       }
> > > > > >     });
> > > > > > ------
> > > > > > I get errors in the log again, that it can't find
> > > > > > BigDecimalColumnInterpreter... okay, so I tried
> > > > > > ------
> > > > > > Scan scan = new Scan((metricID + "," +
> basetime_begin).getBytes(),
> > > > > > (metricID + "," + basetime_end).getBytes());
> > > > > > scan.addFamily(family.getBytes());
> > > > > > final ColumnInterpreter<BigDecimal, BigDecimal> ci = new
> > > > > > BigDecimalColumnInterpreter();
> > > > > > AggregationClient ag = new AggregationClient(config);
> > > > > > BigDecimal max = ag.max(Bytes.toBytes(tableName), ci, scan);
> > > > > > ------
> > > > > > I don't get errors recored in the log anymore, but a load of
Java
> > > error
> > > > > > output:
> > > > > > ------
> > > > > >
> > > > > > java.util.concurrent.ExecutionException:
> > > > > > org.apache.hadoop.hbase.client.RetriesExhaustedException: Failed
> > > after
> > > > > > attempts=10, exceptions:
> > > > > > Wed Sep 05 18:13:43 CEST 2012,
> > > > > > org.apache.hadoop.hbase.ipc.ExecRPCInvoker$1@50502819,
> > > > > > java.io.IOException:
> > > > > > IPC server unable to read call parameters: Error in readFields
> > > > > > Wed Sep 05 18:13:44 CEST 2012,
> > > > > > org.apache.hadoop.hbase.ipc.ExecRPCInvoker$1@50502819,
> > > > > > java.io.IOException:
> > > > > > IPC server unable to read call parameters: Error in readFields
> > > > > > Wed Sep 05 18:13:45 CEST 2012,
> > > > > > org.apache.hadoop.hbase.ipc.ExecRPCInvoker$1@50502819,
> > > > > > java.io.IOException:
> > > > > > IPC server unable to read call parameters: Error in readFields
> > > > > > Wed Sep 05 18:13:46 CEST 2012,
> > > > > > org.apache.hadoop.hbase.ipc.ExecRPCInvoker$1@50502819,
> > > > > > java.io.IOException:
> > > > > > IPC server unable to read call parameters: Error in readFields
> > > > > > Wed Sep 05 18:13:49 CEST 2012,
> > > > > > org.apache.hadoop.hbase.ipc.ExecRPCInvoker$1@50502819,
> > > > > > java.io.IOException:
> > > > > > IPC server unable to read call parameters: Error in readFields
> > > > > > Wed Sep 05 18:13:51 CEST 2012,
> > > > > > org.apache.hadoop.hbase.ipc.ExecRPCInvoker$1@50502819,
> > > > > > java.io.IOException:
> > > > > > IPC server unable to read call parameters: Error in readFields
> > > > > > Wed Sep 05 18:13:55 CEST 2012,
> > > > > > org.apache.hadoop.hbase.ipc.ExecRPCInvoker$1@50502819,
> > > > > > java.io.IOException:
> > > > > > IPC server unable to read call parameters: Error in readFields
> > > > > > Wed Sep 05 18:13:59 CEST 2012,
> > > > > > org.apache.hadoop.hbase.ipc.ExecRPCInvoker$1@50502819,
> > > > > > java.io.IOException:
> > > > > > IPC server unable to read call parameters: Error in readFields
> > > > > > Wed Sep 05 18:14:07 CEST 2012,
> > > > > > org.apache.hadoop.hbase.ipc.ExecRPCInvoker$1@50502819,
> > > > > > java.io.IOException:
> > > > > > IPC server unable to read call parameters: Error in readFields
> > > > > > Wed Sep 05 18:14:23 CEST 2012,
> > > > > > org.apache.hadoop.hbase.ipc.ExecRPCInvoker$1@50502819,
> > > > > > java.io.IOException:
> > > > > > IPC server unable to read call parameters: Error in readFields
> > > > > >
> > > > > > at
> > java.util.concurrent.FutureTask$Sync.innerGet(FutureTask.java:252)
> > > > > > at java.util.concurrent.FutureTask.get(FutureTask.java:111)
> > > > > > at
> > > > > >
> > > > > >
> > > > >
> > > >
> > >
> >
> org.apache.hadoop.hbase.client.HConnectionManager$HConnectionImplementation.processExecs(HConnectionManager.java:1434)
> > > > > > at
> > > > >
> > org.apache.hadoop.hbase.client.HTable.coprocessorExec(HTable.java:1263)
> > > > > > at
> > > > > >
> > > > > >
> > > > >
> > > >
> > >
> >
> org.apache.hadoop.hbase.client.coprocessor.AggregationClient.sum(AggregationClient.java:259)
> > > > > > at
> > > > > >
> > > > > >
> > > > >
> > > >
> > >
> >
> helpers.HbaseReaderBigDecimal.getWeeksumSCAN(HbaseReaderBigDecimal.java:360)
> > > > > > at
> > helpers.HbaseReaderBigDecimal.main(HbaseReaderBigDecimal.java:81)
> > > > > > Caused by:
> > org.apache.hadoop.hbase.client.RetriesExhaustedException:
> > > > > Failed
> > > > > > after attempts=10, exceptions:
> > > > > > Wed Sep 05 18:13:43 CEST 2012,
> > > > > > org.apache.hadoop.hbase.ipc.ExecRPCInvoker$1@50502819,
> > > > > > java.io.IOException:
> > > > > > IPC server unable to read call parameters: Error in readFields
> > > > > > Wed Sep 05 18:13:44 CEST 2012,
> > > > > > org.apache.hadoop.hbase.ipc.ExecRPCInvoker$1@50502819,
> > > > > > java.io.IOException:
> > > > > > IPC server unable to read call parameters: Error in readFields
> > > > > > Wed Sep 05 18:13:45 CEST 2012,
> > > > > > org.apache.hadoop.hbase.ipc.ExecRPCInvoker$1@50502819,
> > > > > > java.io.IOException:
> > > > > > IPC server unable to read call parameters: Error in readFields
> > > > > > Wed Sep 05 18:13:46 CEST 2012,
> > > > > > org.apache.hadoop.hbase.ipc.ExecRPCInvoker$1@50502819,
> > > > > > java.io.IOException:
> > > > > > IPC server unable to read call parameters: Error in readFields
> > > > > > Wed Sep 05 18:13:49 CEST 2012,
> > > > > > org.apache.hadoop.hbase.ipc.ExecRPCInvoker$1@50502819,
> > > > > > java.io.IOException:
> > > > > > IPC server unable to read call parameters: Error in readFields
> > > > > > Wed Sep 05 18:13:51 CEST 2012,
> > > > > > org.apache.hadoop.hbase.ipc.ExecRPCInvoker$1@50502819,
> > > > > > java.io.IOException:
> > > > > > IPC server unable to read call parameters: Error in readFields
> > > > > > Wed Sep 05 18:13:55 CEST 2012,
> > > > > > org.apache.hadoop.hbase.ipc.ExecRPCInvoker$1@50502819,
> > > > > > java.io.IOException:
> > > > > > IPC server unable to read call parameters: Error in readFields
> > > > > > Wed Sep 05 18:13:59 CEST 2012,
> > > > > > org.apache.hadoop.hbase.ipc.ExecRPCInvoker$1@50502819,
> > > > > > java.io.IOException:
> > > > > > IPC server unable to read call parameters: Error in readFields
> > > > > > Wed Sep 05 18:14:07 CEST 2012,
> > > > > > org.apache.hadoop.hbase.ipc.ExecRPCInvoker$1@50502819,
> > > > > > java.io.IOException:
> > > > > > IPC server unable to read call parameters: Error in readFields
> > > > > > Wed Sep 05 18:14:23 CEST 2012,
> > > > > > org.apache.hadoop.hbase.ipc.ExecRPCInvoker$1@50502819,
> > > > > > java.io.IOException:
> > > > > > IPC server unable to read call parameters: Error in readFields
> > > > > >
> > > > > > at
> > > > > >
> > > > > >
> > > > >
> > > >
> > >
> >
> org.apache.hadoop.hbase.client.ServerCallable.withRetries(ServerCallable.java:183)
> > > > > > at
> > > > > >
> > > >
> > org.apache.hadoop.hbase.ipc.ExecRPCInvoker.invoke(ExecRPCInvoker.java:79)
> > > > > > at $Proxy7.getSum(Unknown Source)
> > > > > > at
> > > > > >
> > > > > >
> > > > >
> > > >
> > >
> >
> org.apache.hadoop.hbase.client.coprocessor.AggregationClient$4.call(AggregationClient.java:263)
> > > > > > at
> > > > > >
> > > > > >
> > > > >
> > > >
> > >
> >
> org.apache.hadoop.hbase.client.coprocessor.AggregationClient$4.call(AggregationClient.java:260)
> > > > > > at
> > > > > >
> > > > > >
> > > > >
> > > >
> > >
> >
> org.apache.hadoop.hbase.client.HConnectionManager$HConnectionImplementation$4.call(HConnectionManager.java:1422)
> > > > > > at
> > java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:334)
> > > > > > at java.util.concurrent.FutureTask.run(FutureTask.java:166)
> > > > > > at
> > > > > >
> > > > > >
> > > > >
> > > >
> > >
> >
> java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1110)
> > > > > > at
> > > > > >
> > > > > >
> > > > >
> > > >
> > >
> >
> java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:603)
> > > > > > at java.lang.Thread.run(Thread.java:679)
> > > > > > org.apache.hadoop.hbase.client.RetriesExhaustedException: Failed
> > > after
> > > > > > attempts=10, exceptions:
> > > > > > Wed Sep 05 18:13:43 CEST 2012,
> > > > > > org.apache.hadoop.hbase.ipc.ExecRPCInvoker$1@50502819,
> > > > > > java.io.IOException:
> > > > > > IPC server unable to read call parameters: Error in readFields
> > > > > > Wed Sep 05 18:13:44 CEST 2012,
> > > > > > org.apache.hadoop.hbase.ipc.ExecRPCInvoker$1@50502819,
> > > > > > java.io.IOException:
> > > > > > IPC server unable to read call parameters: Error in readFields
> > > > > > Wed Sep 05 18:13:45 CEST 2012,
> > > > > > org.apache.hadoop.hbase.ipc.ExecRPCInvoker$1@50502819,
> > > > > > java.io.IOException:
> > > > > > IPC server unable to read call parameters: Error in readFields
> > > > > > Wed Sep 05 18:13:46 CEST 2012,
> > > > > > org.apache.hadoop.hbase.ipc.ExecRPCInvoker$1@50502819,
> > > > > > java.io.IOException:
> > > > > > IPC server unable to read call parameters: Error in readFields
> > > > > > Wed Sep 05 18:13:49 CEST 2012,
> > > > > > org.apache.hadoop.hbase.ipc.ExecRPCInvoker$1@50502819,
> > > > > > java.io.IOException:
> > > > > > IPC server unable to read call parameters: Error in readFields
> > > > > > Wed Sep 05 18:13:51 CEST 2012,
> > > > > > org.apache.hadoop.hbase.ipc.ExecRPCInvoker$1@50502819,
> > > > > > java.io.IOException:
> > > > > > IPC server unable to read call parameters: Error in readFields
> > > > > > Wed Sep 05 18:13:55 CEST 2012,
> > > > > > org.apache.hadoop.hbase.ipc.ExecRPCInvoker$1@50502819,
> > > > > > java.io.IOException:
> > > > > > IPC server unable to read call parameters: Error in readFields
> > > > > > Wed Sep 05 18:13:59 CEST 2012,
> > > > > > org.apache.hadoop.hbase.ipc.ExecRPCInvoker$1@50502819,
> > > > > > java.io.IOException:
> > > > > > IPC server unable to read call parameters: Error in readFields
> > > > > > Wed Sep 05 18:14:07 CEST 2012,
> > > > > > org.apache.hadoop.hbase.ipc.ExecRPCInvoker$1@50502819,
> > > > > > java.io.IOException:
> > > > > > IPC server unable to read call parameters: Error in readFields
> > > > > > Wed Sep 05 18:14:23 CEST 2012,
> > > > > > org.apache.hadoop.hbase.ipc.ExecRPCInvoker$1@50502819,
> > > > > > java.io.IOException:
> > > > > > IPC server unable to read call parameters: Error in readFields
> > > > > >
> > > > > > at
> > > > > >
> > > > > >
> > > > >
> > > >
> > >
> >
> org.apache.hadoop.hbase.client.ServerCallable.withRetries(ServerCallable.java:183)
> > > > > > at
> > > > > >
> > > >
> > org.apache.hadoop.hbase.ipc.ExecRPCInvoker.invoke(ExecRPCInvoker.java:79)
> > > > > > at $Proxy7.getSum(Unknown Source)
> > > > > > at
> > > > > >
> > > > > >
> > > > >
> > > >
> > >
> >
> org.apache.hadoop.hbase.client.coprocessor.AggregationClient$4.call(AggregationClient.java:263)
> > > > > > at
> > > > > >
> > > > > >
> > > > >
> > > >
> > >
> >
> org.apache.hadoop.hbase.client.coprocessor.AggregationClient$4.call(AggregationClient.java:260)
> > > > > > at
> > > > > >
> > > > > >
> > > > >
> > > >
> > >
> >
> org.apache.hadoop.hbase.client.HConnectionManager$HConnectionImplementation$4.call(HConnectionManager.java:1422)
> > > > > > at
> > java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:334)
> > > > > > at java.util.concurrent.FutureTask.run(FutureTask.java:166)
> > > > > > at
> > > > > >
> > > > > >
> > > > >
> > > >
> > >
> >
> java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1110)
> > > > > > at
> > > > > >
> > > > > >
> > > > >
> > > >
> > >
> >
> java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:603)
> > > > > > at java.lang.Thread.run(Thread.java:679)
> > > > > >
> > > > > > ------
> > > > > >
> > > > > > I'm not really sure about what I'm doing wrong. Does anyone
have
> a
> > > hint
> > > > > > towards the right direction?
> > > > > >
> > > > >
> > > >
> > >
> >
>

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