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From Nanheng Wu <nanhen...@gmail.com>
Subject Re: Use loadtable.rb with compressed data?
Date Fri, 28 Jan 2011 18:41:45 GMT
Sorry, by dumping the metadata did you mean running the same HFile
tool on ".region" file in each region?

On Fri, Jan 28, 2011 at 10:25 AM, Stack <stack@duboce.net> wrote:
> If you dump the metadata, does it claim GZIP compressor?  If so, yeah,
> seems to be mismatch between what data is and what metadata is.
> St.Ack
>
> On Fri, Jan 28, 2011 at 9:58 AM, Nanheng Wu <nanhengwu@gmail.com> wrote:
>> Awesome. I ran it on one of the hfiles and got this:
>> 11/01/28 09:57:15 INFO compress.CodecPool: Got brand-new decompressor
>> java.io.IOException: Not in GZIP format
>>        at java.util.zip.GZIPInputStream.readHeader(GZIPInputStream.java:137)
>>        at java.util.zip.GZIPInputStream.<init>(GZIPInputStream.java:58)
>>        at java.util.zip.GZIPInputStream.<init>(GZIPInputStream.java:68)
>>        at org.apache.hadoop.io.compress.GzipCodec$GzipInputStream$ResetableGZIPInputStream.<init>(GzipCodec.java:92)
>>        at org.apache.hadoop.io.compress.GzipCodec$GzipInputStream.<init>(GzipCodec.java:101)
>>        at org.apache.hadoop.io.compress.GzipCodec.createInputStream(GzipCodec.java:169)
>>        at org.apache.hadoop.io.compress.GzipCodec.createInputStream(GzipCodec.java:179)
>>        at org.apache.hadoop.hbase.io.hfile.Compression$Algorithm.createDecompressionStream(Compression.java:168)
>>        at org.apache.hadoop.hbase.io.hfile.HFile$Reader.decompress(HFile.java:1013)
>>        at org.apache.hadoop.hbase.io.hfile.HFile$Reader.readBlock(HFile.java:966)
>>        at org.apache.hadoop.hbase.io.hfile.HFile$Reader$Scanner.seekTo(HFile.java:1291)
>>        at org.apache.hadoop.hbase.io.hfile.HFile.main(HFile.java:1740)
>>
>> So the problem could be that HFile writer is not writing properly
>> gzipped outputs?
>>
>>
>> On Fri, Jan 28, 2011 at 9:41 AM, Stack <stack@duboce.net> wrote:
>>> The section in 0.90 book on hfile tool should apply to 0.20.6:
>>> http://hbase.apache.org/ch08s02.html#hfile_tool  It might help you w/
>>> your explorations.
>>>
>>> St.Ack
>>>
>>> On Fri, Jan 28, 2011 at 9:38 AM, Nanheng Wu <nanhengwu@gmail.com> wrote:
>>>> Hi Stack,
>>>>
>>>>  Get doesn't work either. It was a fresh table created by
>>>> loadtable.rb. Finally, the uncompressed version had the same number of
>>>> regions (8 total). I totally understand you guys shouldn't be patching
>>>> the older version, upgrading for me is an option but will be pretty
>>>> painful. I wonder if I can figure something out by comparing the two
>>>> version's Hfile. Thanks again!
>>>>
>>>> On Fri, Jan 28, 2011 at 9:14 AM, Stack <stack@duboce.net> wrote:
>>>>> On Thu, Jan 27, 2011 at 9:35 PM, Nanheng Wu <nanhengwu@gmail.com>
wrote:
>>>>>> In the compressed case, there are 8 regions and the region start/end
>>>>>> keys do line up. Which actually is confusing to me, how can hbase
read
>>>>>> the files if they are compressed? does each hfile have some metadata
>>>>>> in it that has compression info?
>>>>>
>>>>> You got it.
>>>>>
>>>>>> Anyway, the regions are the same
>>>>>> (numbers and boundaries are same) in both compressed and uncompressed
>>>>>> version. So what else should I look into to fix this? Thanks again!
>>>>>
>>>>> You can't scan. Can you Get from the table at all?  Try getting start
>>>>> key from a few of the regions you see in .META.
>>>>>
>>>>> Did this table preexist or was this a fresh creation?
>>>>>
>>>>> When you created this table uncompressed, how many regions was it?
>>>>>
>>>>> How about just running uncompressed while you are on 0.20.6?  We'd
>>>>> rather be fixing bugs in the new stuff, not the version that we are
>>>>> leaving behind?
>>>>>
>>>>> Thanks,
>>>>> St.Ack
>>>>>
>>>>
>>>
>>
>

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