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Re: WARNING! Object DB conversion (was Re: [PATCH] write-tree performance problems)

From
MUMartin Uecker <muecker@gmx.de>
Date
Apr 20, 2005, 16:33 UTC
Message-ID
<20050420163342.GA14434@macavity>
In-Reply-To
<20050420155734.GA13575@macavity>
On Wed, Apr 20, 2005 at 05:57:34PM +0200, Martin Uecker wrote:
Show 10 quoted lines
> On Wed, Apr 20, 2005 at 11:28:20AM -0400, C. Scott Ananian wrote:
> 
> > Yes, I guess this is the detail I was going to abandon. =)
> > 
> > I viewed the fact that the top-level hash was dependent on the exact chunk 
> > makeup a 'misfeature', because it doesn't allow easy interoperability with 
> > existing non-chunked repos.
> 
> I thought this as a misfeature too before I realized how
> many advantages this has.

To make it more clear: Ofcourse it is a bug if the hash depends on unimportant implementation details.

But a hash which is calculated recusively from subhashes is a lot more usefull than a hash which can only be calculated from the entire data at once. And if this hash can be recalculated cheaply from subhashes even if some data was inserted somewhere this is an even more usefull thing.

Martin
-- 
One night, when little Giana from Milano was fast asleep,
she had a strange dream.
Previous: Martin UeckerNext: C. Scott Ananian
Message 21 of 54 in “write-tree performance problems”
  1. write-tree performance problemsChris Mason, Apr 19, 2005
  2. Linus TorvaldsApr 19, 2005
  3. Chris MasonApr 19, 2005
  4. Linus TorvaldsApr 19, 2005
  5. Chris MasonApr 19, 2005
  6. Linus TorvaldsApr 19, 2005
  7. Chris MasonApr 20, 2005
  8. Linus TorvaldsApr 20, 2005
  9. Linus TorvaldsApr 20, 2005
  10. H. Peter AnvinApr 20, 2005
  11. WARNING! Object DB conversion (was Re: [PATCH] write-tree performance problems)Linus Torvalds, Apr 20, 2005
  12. Ingo MolnarApr 20, 2005
  13. Jon SeymourApr 20, 2005
  14. Martin UeckerApr 20, 2005
  15. Morten WelinderApr 20, 2005
  16. Jon SeymourApr 20, 2005
  17. C. Scott AnanianApr 20, 2005
  18. Martin UeckerApr 20, 2005
  19. C. Scott AnanianApr 20, 2005
  20. Martin UeckerApr 20, 2005
  21. Martin UeckerApr 20, 2005
  22. Blob chunking code. [First look.]C. Scott Ananian, Apr 20, 2005
  23. Blob chunking code. [Second look]C. Scott Ananian, Apr 20, 2005
  24. David WoodhouseApr 20, 2005
  25. Linus TorvaldsApr 20, 2005
  26. David WoodhouseApr 20, 2005
  27. Chris MasonApr 20, 2005
  28. C. Scott AnanianApr 20, 2005
  29. Linus TorvaldsApr 20, 2005
  30. C. Scott AnanianApr 20, 2005
  31. Linus TorvaldsApr 20, 2005
  32. Linus TorvaldsApr 20, 2005
  33. David WillmoreApr 20, 2005
  34. Linus TorvaldsApr 20, 2005
  35. Linus TorvaldsApr 20, 2005
  36. Chris MasonApr 20, 2005
  37. Linus TorvaldsApr 20, 2005
  38. Chris MasonApr 20, 2005
  39. Linus TorvaldsApr 20, 2005
  40. Chris MasonApr 20, 2005
  41. Linus TorvaldsApr 20, 2005
  42. Linus TorvaldsApr 20, 2005
  43. David S. MillerApr 20, 2005
  44. David LangApr 19, 2005
  45. Linus TorvaldsApr 19, 2005
  46. David LangApr 19, 2005
  47. Linus TorvaldsApr 19, 2005
  48. David LangApr 19, 2005
  49. Linus TorvaldsApr 19, 2005
  50. Christopher LiApr 19, 2005
  51. Olivier GalibertApr 19, 2005
  52. C. Scott AnanianApr 19, 2005
  53. Linus TorvaldsApr 20, 2005
  54. C. Scott AnanianApr 20, 2005

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