Useful advice for OOM during smart server command?

[John Arbash Meinel]

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On 03/10/2011 02:12 AM, Martin (gzlist) wrote:
> What's most practical suggestion to give to a user who hits an out of
> memory situation, particularly when the problem occurs on a remote
> server? I'm looking to add some documentation[1] that's more helpful
> than generic "upgrade bzr" or "buy more ram" responses.
> 
> It's obviously a condition users run into in practice, and not all of
> them of the Don't Do That Then "trying to commit my 4GB raw video"
> kind of thing. Though unlike other projects[2], bzr doesn't really
> have a good story for those people.
> 
> A number of the bug reports seem to be during auto-repacking[3][4],
> such as a repo with a 68MB file on a vm with 256MB memory allocated[5]
> during push.
> 
> Possible options I've seen suggested in the past:
> 
> * Rewrite history to omit the giant file
> * Retry the operation with nosmart+
> * Run `bzr pack nosmart+<url>`
> 
> The first is probably the best solution in many circumstances, but
> isn't trivial and I'm not sure what existing documentation we have for
> the process.
> 
> Martin
> 
> 
> [1]: "Proposal to merge branch"
> https://code.launchpad.net/~gz/bzr/smarter_smart_error_reporting_full_722416/+merge/51969
> [2]: "Large file management with git-annex"
> http://lwn.net/Articles/419241/
> [3]: "Out of memory error in _ensure_content on auto repacking"
> https://bugs.launchpad.net/bzr/+bug/602614
> [4]: "AssertionError in
> bzrlib._groupcompress_pyx.DeltaIndex._populate_first_index"
> https://bugs.launchpad.net/bzr/+bug/633336
> [5]: "out of memory in
> bzrlib._groupcompress_pyx.DeltaIndex._populate_first_index"
> https://bugs.launchpad.net/bzr/+bug/721897
> 

I don't think we have much ability for (1). There is something like
fast-export + filter + fast-import. But I don't have a great
understanding of how that can work.

John
=:->
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