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From "Tim Sears (JIRA)" <j...@apache.org>
Subject [jira] [Comment Edited] (BEAM-683) Make BZIP compressed files splittable
Date Thu, 29 Sep 2016 04:10:20 GMT

    [ https://issues.apache.org/jira/browse/BEAM-683?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15531719#comment-15531719
] 

Tim Sears edited comment on BEAM-683 at 9/29/16 4:09 AM:
---------------------------------------------------------

I worked on this a bitt, adding a {{seek(byte_offset) }} and {{get_block()}} method to the
_CompressedFile class (see [commit|https://github.com/tim1357/incubator-beam/commit/891bf0a6f064698422a7612c04659e8ac2b2494d]).



was (Author: tim1357):
I worked on this a bitt, adding a {{seek(byte_offset)} and {{get_block()}} method to the _CompressedFile
class (see [commit|https://github.com/tim1357/incubator-beam/commit/891bf0a6f064698422a7612c04659e8ac2b2494d]).


> Make BZIP compressed files splittable 
> --------------------------------------
>
>                 Key: BEAM-683
>                 URL: https://issues.apache.org/jira/browse/BEAM-683
>             Project: Beam
>          Issue Type: Wish
>            Reporter: Tim Sears
>            Priority: Minor
>   Original Estimate: 10h
>  Remaining Estimate: 10h
>
> Bzip2 is compressed as blocks, so it should be possible to do dynamic splitting. To do
this: Seek to a location in the bzip, then keep seeking until you find the 6 byte block-start
sequence 0x314159265359 (which is the 12 digit approximation of pi). You can use a bzip2 decompressor
from that point onwards.



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