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From Alfonso Nishikawa <alfonso.nishik...@gmail.com>
Subject Re: Need Urgent Help with Giraph-Gora
Date Wed, 04 Oct 2017 09:03:56 GMT
Hi,

Generically speaking, you can't add data writing directly a row with "put
...". You should create a small program that creates the entity and persist
it.
The fields at HBase are encoded and serialized (depending on the case).

Your exact error is because an issue reading 'vertices:vertexId': the long
is expected to be 8 bytes when read with #fromBytes().
When being written with Gora, it is converted to bytes with HBase's method
Byte.toBytes() [1]. As you can see, it actually writes 8 bytes.

Maybe something like:

    put 'graphGiraph', '0', 'vertices:vertexId', '\0\0\0\0\0\0\0\0'

could work, but I assuume that you will face further problems reading
'vertices:edges'.
My recomendation is the one from the beginning: write a small program to
write that value through Gora.

[1]-
https://github.com/apache/hbase/blob/master/hbase-common/src/main/java/org/apache/hadoop/hbase/util/Bytes.java#L758

Regards,

Alffonso Nishikawa


2017-10-04 7:31 GMT-01:00 Adhish Singla <adhish.singla@research.iiit.ac.in>:

> This is the Stack Trace to the issue mentioned in the previous reply :
>
> java.lang.IllegalArgumentException: offset (0) + length (8) exceed the
> capacity of the array: 1
>         at org.apache.hadoop.hbase.util.Bytes.explainWrongLengthOrOffset(
> Bytes.java:543)
>         at org.apache.hadoop.hbase.util.Bytes.toLong(Bytes.java:521)
>         at org.apache.hadoop.hbase.util.Bytes.toLong(Bytes.java:494)
>         at org.apache.gora.hbase.util.HBaseByteInterface.fromBytes(
> HBaseByteInterface.java:88)
>         at org.apache.gora.hbase.store.HBaseStore.setField(
> HBaseStore.java:715)
>         at org.apache.gora.hbase.store.HBaseStore.setField(
> HBaseStore.java:681)
>         at org.apache.gora.hbase.store.HBaseStore.newInstance(
> HBaseStore.java:627)
>         at org.apache.gora.hbase.query.HBaseResult.readNext(
> HBaseResult.java:48)
>         at org.apache.gora.hbase.query.HBaseScannerResult.nextInner(
> HBaseScannerResult.java:54)
>         at org.apache.gora.query.impl.ResultBase.next(ResultBase.java:114)
>         at org.apache.giraph.io.gora.GoraVertexInputFormat$
> GoraVertexReader.nextVertex(GoraVertexInputFormat.java:227)
>         at org.apache.giraph.io.internal.WrappedVertexReader.nextVertex(
> WrappedVertexReader.java:84)
>         at org.apache.giraph.worker.VertexInputSplitsCallable.
> readInputSplit(VertexInputSplitsCallable.java:169)
>         at org.apache.giraph.worker.InputSplitsCallable.loadInputSplit(
> InputSplitsCallable.java:267)
>         at org.apache.giraph.worker.InputSplitsCallable.call(
> InputSplitsCallable.java:212)
>         at org.apache.giraph.worker.InputSplitsCallable.call(
> InputSplitsCallable.java:60)
>         at org.apache.giraph.utils.LogStacktraceCallable.call(
> LogStacktraceCallable.java:51)
>         at java.util.concurrent.FutureTask.run(FutureTask.java:262)
>         at java.util.concurrent.ThreadPoolExecutor.runWorker(
> ThreadPoolExecutor.java:1145)
>         at java.util.concurrent.ThreadPoolExecutor$Worker.run(
> ThreadPoolExecutor.java:615)
>         at java.lang.Thread.run(Thread.java:745)
>
> ----- Original Message -----
> From: "Adhish Singla" <adhish.singla@research.iiit.ac.in>
> To: user@gora.apache.org
> Sent: Wednesday, October 4, 2017 12:57:21 PM
> Subject: Re: Need Urgent Help with Giraph-Gora
>
> I need to have a readable dummy entry in Hbase to start my computation,
> and the Gora object reader is not able to read it.
>
> I try to add a dummy entry to HBase using this shell command :
>
> "put 'graphGiraph', '0', 'vertices:vertexId', '0'"
>
> And when I run my code, I get this error in the Logs :
>
> 2017-10-04 07:16:06,210 ERROR [load-0] gora.GoraVertexInputFormat
> (GoraVertexInputFormat.java:nextVertex(231)) - Error transforming
> vertices.
> 2017-10-04 07:16:06,210 ERROR [load-0] gora.GoraVertexInputFormat
> (GoraVertexInputFormat.java:nextVertex(232)) - offset (0) + length (8)
> exceed the capacity of the array: 1
>
> ----- Original Message -----
> From: "lewismc" <lewismc@apache.org>
> To: "Adhish Singla" <adhish.singla@research.iiit.ac.in>,
> user@gora.apache.org
> Sent: Wednesday, October 4, 2017 12:48:39 PM
> Subject: Re: Need Urgent Help with Giraph-Gora
>
> What exactly is thebissue you are having here?
> From what I can tell all of the code looks good... is a log being
> generated? Are you seeing errors? If so can you provide them?
> Always remember you need to make sure any changes in your Avro schema are
> compiled with the GoraCompiler.
> Thanks
>
> On Tue, Oct 3, 2017 at 10:37 PM Adhish Singla <
> adhish.singla@research.iiit.ac.in> wrote:
>
> > Hi,
> >
> > I have attached the screenshots to the Avro schema,
> gora-hbase-mapping.xml
> > and the gora-object-reader. Kindly point out to my mistake which I
> probably
> > think is in the gora-hbase-mapping.xml.
> >
> > Thanks and regards,
> > Adhish
> >
> > ----- Original Message -----
> > From: "lewis john mcgibbney" <lewismc@apache.org>
> > To: "<user@gora.apache.org>" <user@gora.apache.org>
> > Sent: Wednesday, October 4, 2017 2:56:28 AM
> > Subject: Re: Need Urgent Help with Giraph-Gora
> >
> > Can you send a link to your current gora-hbase-mapping.xml and Avro
> schema?
> > If not then merely paste them below.
> > Lewis
> >
> > On Tue, Oct 3, 2017 at 8:28 AM, Adhish Singla <
> > adhish.singla@research.iiit.ac.in> wrote:
> >
> > > Hi,
> > >
> > > I was able to resolve the issue by adding the resources to the JAR
> > itself.
> > > Now, I am stuck at writing the gora-hbase-mapping.xml since my avro
> > schema
> > > uses a nested records i.e. one record stores another record. Kindly
> help
> > me
> > > with the same.
> > >
> > > I would like to contribute to update giraph to use the latest version
> of
> > > gora once I am able to cover up with my coming deadline.
> > >
> > > Thanks for the help.
> > > Regards,
> > > Adhish
> > >
>
> --
> http://home.apache.org/~lewismc/
> @hectorMcSpector
> http://www.linkedin.com/in/lmcgibbney
>

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