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Posted to dev@accumulo.apache.org by "panqingcui@163.com" <pa...@163.com> on 2014/12/11 03:14:11 UTC
accumulo Scanner
HI
Scanner full table, but need the data in each row, is the rowkey of the same
data, save data to JavaBean.
<http://apache-accumulo.1065345.n5.nabble.com/file/n12506/accumulo.png>
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Re: accumulo Scanner
Posted by Ryan Leary <ry...@bbn.com>.
One option is to implement a class extending the RowEncodingIterator:
http://accumulo.apache.org/1.6/apidocs/org/apache/accumulo/core/iterators/user/RowEncodingIterator.html <http://accumulo.apache.org/1.6/apidocs/org/apache/accumulo/core/iterators/user/RowEncodingIterator.html>
I personally have implementations that will automatically return a serialized protocol buffer or thrift object based on keys in the data. I think it should be possible to implement an iterator with rowEncoder and rowDecoder methods to convert to a JavaBean.
> On Dec 10, 2014, at 9:55 PM, Russ Weeks <rw...@newbrightidea.com> wrote:
>
> You can use the WholeRowIterator to get a map of all key/value pairs for a
> single row. It works as long as your row is small enough to fit in memory.
>
> I don't know of any libraries convert between a row and a JavaBean. Typo[2]
> is the closest project I know of.
>
> -Russ
>
> 1:
> http://accumulo.apache.org/1.6/apidocs/org/apache/accumulo/core/iterators/user/WholeRowIterator.html
> 2:https://github.com/keith-turner/typo
>
> On Wed, Dec 10, 2014 at 6:14 PM, panqingcui@163.com <pa...@163.com>
> wrote:
>
>> HI
>> Scanner full table, but need the data in each row, is the rowkey of the
>> same
>> data, save data to JavaBean.
>>
>> <http://apache-accumulo.1065345.n5.nabble.com/file/n12506/accumulo.png>
>>
>>
>>
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>> View this message in context:
>> http://apache-accumulo.1065345.n5.nabble.com/accumulo-Scanner-tp12506.html
>> Sent from the Developers mailing list archive at Nabble.com.
>>
Re: accumulo Scanner
Posted by "panqingcui@163.com" <pa...@163.com>.
Thank you for your reply, have time to Chinese play.
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Re: accumulo Scanner
Posted by Corey Nolet <cj...@gmail.com>.
You're going to want to use WholeRowIterator.decodeRow(entry.getKey(),
entry.getValue()) for that one. You can do:
for(Entry<Key,Value> entry : scanner) {
for(Entry<Key,Value> actualEntry :
WholeRowIterator.decodeRow(entry.getKey(), entry.getValue()).entrySet()) {
// do something with actualEntry
}
}
On Thu, Dec 11, 2014 at 10:24 PM, panqingcui@163.com <pa...@163.com>
wrote:
> I try to use the WholeRowIterator, the same rowkey data into a line, Now,
> Value contains ColumnFamily, ColumnQualifier, value，but the value of Value
> should be how to analysis?
>
> for (Entry<Key, Value> entry : scanner) {
> log.info("" + entry.getKey() + "," + entry.getValue());
> }
>
>
>
>
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> View this message in context:
> http://apache-accumulo.1065345.n5.nabble.com/accumulo-Scanner-tp12506p12552.html
> Sent from the Developers mailing list archive at Nabble.com.
>
Re: accumulo Scanner
Posted by "panqingcui@163.com" <pa...@163.com>.
I try to use the WholeRowIterator, the same rowkey data into a line, Now,
Value contains ColumnFamily, ColumnQualifier, value，but the value of Value
should be how to analysis?
for (Entry<Key, Value> entry : scanner) {
log.info("" + entry.getKey() + "," + entry.getValue());
}
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Re: accumulo Scanner
Posted by Russ Weeks <rw...@newbrightidea.com>.
You can use the WholeRowIterator to get a map of all key/value pairs for a
single row. It works as long as your row is small enough to fit in memory.
I don't know of any libraries convert between a row and a JavaBean. Typo[2]
is the closest project I know of.
-Russ
1:
http://accumulo.apache.org/1.6/apidocs/org/apache/accumulo/core/iterators/user/WholeRowIterator.html
2:https://github.com/keith-turner/typo
On Wed, Dec 10, 2014 at 6:14 PM, panqingcui@163.com <pa...@163.com>
wrote:
> HI
> Scanner full table, but need the data in each row, is the rowkey of the
> same
> data, save data to JavaBean.
>
> <http://apache-accumulo.1065345.n5.nabble.com/file/n12506/accumulo.png>
>
>
>
> --
> View this message in context:
> http://apache-accumulo.1065345.n5.nabble.com/accumulo-Scanner-tp12506.html
> Sent from the Developers mailing list archive at Nabble.com.
>