Hello,

Can anyone give me a example to construct the  HFileReaderV2 object to
read the HFile content.

Thanks!

Yong

On Fri, Mar 16, 2012 at 9:01 AM, yonghu <[EMAIL PROTECTED]> wrote:
> Hello,
>
> Can anyone give me a example to construct the  HFileReaderV2 object to
> read the HFile content.
>
> Thanks!
>

See http://hbase.apache.org/xref/org/apache/hadoop/hbase/io/hfile/HFile.html#499

St.Ack

Thanks for your information.

Regards!

Yong

On Fri, Mar 16, 2012 at 5:39 PM, Stack <[EMAIL PROTECTED]> wrote:
> On Fri, Mar 16, 2012 at 9:01 AM, yonghu <[EMAIL PROTECTED]> wrote:
>> Hello,
>>
>> Can anyone give me a example to construct the  HFileReaderV2 object to
>> read the HFile content.
>>
>> Thanks!
>>
>
> See http://hbase.apache.org/xref/org/apache/hadoop/hbase/io/hfile/HFile.html#499
>
> St.Ack

I implemented the code like this way. My Hbase version is 0.92.0.

                Configuration conf = new Configuration();
CacheConfig cconf = new CacheConfig(conf);
FileSystem fs = FileSystem.get(conf);
Path path = new
Path("hdfs://localhost:8020/hbase/test/97366a27a98e0f43dfcecf9b63abd630/Course/33b6235defe44f69bda69c04e87fc7a9");
HFile.Reader reader = HFile.createReader(fs, path, cconf);
HFileScanner hscanner = reader.getScanner(false, false, false);
hscanner.seekTo();
KeyValue kv = hscanner.getKeyValue();
System.out.println(kv.toString() + "+" + kv.getValue().toString());
while(hscanner.next()){
kv = hscanner.getKeyValue();
System.out.println(kv.toString() + "+" + kv.getValue().toString());
               }

I have already flush the data from the memstore into the disk. But I
got the error information, Exception in thread "main"
java.io.IOException: Cannot open filename
/hbase/test/97366a27a98e0f43dfcecf9b63abd630/Course/33b6235defe44f69bda69c04e87fc7a9.

I can see the results from the command line. I want to know that why
its code dose not work?

Regards!

Yong

On Fri, Mar 16, 2012 at 5:50 PM, yonghu <[EMAIL PROTECTED]> wrote:
> Thanks for your information.
>
> Regards!
>
> Yong
>
> On Fri, Mar 16, 2012 at 5:39 PM, Stack <[EMAIL PROTECTED]> wrote:
>> On Fri, Mar 16, 2012 at 9:01 AM, yonghu <[EMAIL PROTECTED]> wrote:
>>> Hello,
>>>
>>> Can anyone give me a example to construct the  HFileReaderV2 object to
>>> read the HFile content.
>>>
>>> Thanks!
>>>
>>
>> See http://hbase.apache.org/xref/org/apache/hadoop/hbase/io/hfile/HFile.html#499
>>
>> St.Ack

I noticed the problem is that somehow I lost the data from hdfs. The
code is ok.

Regards!

Yong

On Fri, Mar 16, 2012 at 5:59 PM, yonghu <[EMAIL PROTECTED]> wrote:
> I implemented the code like this way. My Hbase version is 0.92.0.
>
>                Configuration conf = new Configuration();
>                CacheConfig cconf = new CacheConfig(conf);
>                FileSystem fs = FileSystem.get(conf);
>                Path path = new
> Path("hdfs://localhost:8020/hbase/test/97366a27a98e0f43dfcecf9b63abd630/Course/33b6235defe44f69bda69c04e87fc7a9");
>                HFile.Reader reader = HFile.createReader(fs, path, cconf);
>                HFileScanner hscanner = reader.getScanner(false, false, false);
>                hscanner.seekTo();
>                KeyValue kv = hscanner.getKeyValue();
>                System.out.println(kv.toString() + "+" + kv.getValue().toString());
>                while(hscanner.next()){
>                        kv = hscanner.getKeyValue();
>                        System.out.println(kv.toString() + "+" + kv.getValue().toString());
>               }
>
> I have already flush the data from the memstore into the disk. But I
> got the error information, Exception in thread "main"
> java.io.IOException: Cannot open filename
> /hbase/test/97366a27a98e0f43dfcecf9b63abd630/Course/33b6235defe44f69bda69c04e87fc7a9.
>
> I can see the results from the command line. I want to know that why
> its code dose not work?
>
> Regards!
>
> Yong
>
> On Fri, Mar 16, 2012 at 5:50 PM, yonghu <[EMAIL PROTECTED]> wrote:
>> Thanks for your information.
>>
>> Regards!
>>
>> Yong
>>
>> On Fri, Mar 16, 2012 at 5:39 PM, Stack <[EMAIL PROTECTED]> wrote:
>>> On Fri, Mar 16, 2012 at 9:01 AM, yonghu <[EMAIL PROTECTED]> wrote:
>>>> Hello,
>>>>
>>>> Can anyone give me a example to construct the  HFileReaderV2 object to
>>>> read the HFile content.
>>>>
>>>> Thanks!
>>>>
>>>
>>> See http://hbase.apache.org/xref/org/apache/hadoop/hbase/io/hfile/HFile.html#499
>>>
>>> St.Ack

On Fri, Mar 16, 2012 at 10:12 AM, yonghu <[EMAIL PROTECTED]> wrote:
> I noticed the problem is that somehow I lost the data from hdfs. The
> code is ok.
>
> Regards!
>

Why write code?  The hfile tool,
http://hbase.apache.org/book.html#hfile_tool2, gives a pretty rich
summary on file content (or you can ask it dump it for you).

St.Ack