'AbsentContentFactory' object has no attribute 'get_bytes_as' errors with CHK repository on write operations

[Tommaso R. Donnarumma]

When a 2a format 'autopacks' (approximately 1 in 10 commits, some pushes, etc), it will error with 'AbsentContentFactory'. This occurs when *writing* to a repository.

Workaround
=======

Run 'bzr pack' to prevent autopack kicking in.

Fixes
=====

bzr 1.17 and 1.16.1 will include the fix, or bzr.dev rev 4470 has a fix for this bug.

[Andrew Bennetts (spiv)]

There was some chat about this on the mailing list, and stacked branches are not involved. So this is not a duplicate of bug 354036, despite the similar symptom.

[Robert Collins (lifeless)]

Are you doing concurrent operations when this happens? We really need some way to reproduce - perhaps a copy of the project when the error is happening before you pack-to-fix. You could take that copy locally and then we could give you some analysis scripts to run on it.

[Tommaso R. Donnarumma (tawmas)]

Robert, I'm developing solo and I'm doing just one operation at a time.

I'll be glad to run any analysis scripts you will throw at me so long as I can keep the code private. As soon as the error happens again, I'll take a copy of the repository and branches for later dissection. Please, let me know if a recursive copy or rsync is suitable for that.

[Robert Collins (lifeless)]

On Thu, 2009-06-11 at 20:01 +0000, Tommaso R. Donnarumma wrote:
> Robert, I'm developing solo and I'm doing just one operation at a time.
>
> I'll be glad to run any analysis scripts you will throw at me so long as
> I can keep the code private. As soon as the error happens again, I'll
> take a copy of the repository and branches for later dissection. Please,
> let me know if a recursive copy or rsync is suitable for that.

rsync is fine - if you have a shared repository be sure to rsync the
whole repository. What we want is a state where you can trigger the
problem at will; that will let us get to grips with it.

-Rob

[Papadakos Panagiotis (papadako)]

I think I have the same problem. This happens while 'bzr branch' to a shared repository.
I get:

bzr: ERROR: exceptions.AttributeError: 'AbsentContentFactory' object has no attribute 'get_bytes_as'

Traceback (most recent call last):
  File "/usr/lib/python2.5/site-packages/bzrlib/commands.py", line 831, in exception_to_return_code
    return the_callable(*args, **kwargs)
  File "/usr/lib/python2.5/site-packages/bzrlib/commands.py", line 1026, in run_bzr
    ret = run(*run_argv)
  File "/usr/lib/python2.5/site-packages/bzrlib/commands.py", line 643, in run_argv_aliases
    return self.run(**all_cmd_args)
  File "/usr/lib/python2.5/site-packages/bzrlib/builtins.py", line 1173, in run
    source_branch=br_from)
  File "/usr/lib/python2.5/site-packages/bzrlib/bzrdir.py", line 1176, in sprout
    result_repo.fetch(source_repository, revision_id=revision_id)
  File "/usr/lib/python2.5/site-packages/bzrlib/repository.py", line 1552, in fetch
    find_ghosts=find_ghosts, fetch_spec=fetch_spec)
  File "/usr/lib/python2.5/site-packages/bzrlib/decorators.py", line 192, in write_locked
    result = unbound(self, *args, **kwargs)
  File "/usr/lib/python2.5/site-packages/bzrlib/repository.py", line 3184, in fetch
    pb=pb, find_ghosts=find_ghosts)
  File "/usr/lib/python2.5/site-packages/bzrlib/fetch.py", line 79, in __init__
    self.__fetch()
  File "/usr/lib/python2.5/site-packages/bzrlib/fetch.py", line 105, in __fetch
    self._fetch_everything_for_search(search)
  File "/usr/lib/python2.5/site-packages/bzrlib/fetch.py", line 133, in _fetch_everything_for_search
    stream, from_format, [])
  File "/usr/lib/python2.5/site-packages/bzrlib/repository.py", line 3948, in insert_stream
    return self._locked_insert_stream(stream, src_format, is_resume)
  File "/usr/lib/python2.5/site-packages/bzrlib/repository.py", line 4037, in _locked_insert_stream
    self.target_repo.commit_write_group()
  File "/usr/lib/python2.5/site-packages/bzrlib/repository.py", line 1416, in commit_write_group
    self._commit_write_group()
  File "/usr/lib/python2.5/site-packages/bzrlib/repofmt/pack_repo.py", line 2287, in _commit_write_group
    return self._pack_collection._commit_write_group()
  File "/usr/lib/python2.5/site-packages/bzrlib/repofmt/pack_repo.py", line 2097, in _commit_write_group
    if not self.autopack():
  File "/usr/lib/python2.5/site-packages/bzrlib/repofmt/pack_repo.py", line 1466, in autopack
    return self._do_autopack()
  File "/usr/lib/python2.5/site-packages/bzrlib/repofmt/pack_repo.py", line 1506, in _do_autopack
    reload_func=self._restart_autopack)
  File "/usr/lib/python2.5/site-packages/bzrlib/repofmt/groupcompress_repo.py", line 584,...

[Papadakos Panagiotis (papadako)]

Running 'bzr pack' returns:

bzr: ERROR: zlib.error: Error -3 while decompressing: incorrect data check

Traceback (most recent call last):
  File "/usr/lib/python2.5/site-packages/bzrlib/commands.py", line 831, in exception_to_return_code
    return the_callable(*args, **kwargs)
  File "/usr/lib/python2.5/site-packages/bzrlib/commands.py", line 1026, in run_bzr
    ret = run(*run_argv)
  File "/usr/lib/python2.5/site-packages/bzrlib/commands.py", line 643, in run_argv_aliases
    return self.run(**all_cmd_args)
  File "/usr/lib/python2.5/site-packages/bzrlib/builtins.py", line 4164, in run
    repository.pack()
  File "/usr/lib/python2.5/site-packages/bzrlib/decorators.py", line 192, in write_locked
    result = unbound(self, *args, **kwargs)
  File "/usr/lib/python2.5/site-packages/bzrlib/repofmt/pack_repo.py", line 2357, in pack
    self._pack_collection.pack()
  File "/usr/lib/python2.5/site-packages/bzrlib/repofmt/pack_repo.py", line 1580, in pack
    self._execute_pack_operations(pack_operations, OptimisingPacker)
  File "/usr/lib/python2.5/site-packages/bzrlib/repofmt/groupcompress_repo.py", line 584, in _execute_pack_operations
    packer.pack()
  File "/usr/lib/python2.5/site-packages/bzrlib/repofmt/pack_repo.py", line 754, in pack
    return self._create_pack_from_packs()
  File "/usr/lib/python2.5/site-packages/bzrlib/repofmt/groupcompress_repo.py", line 459, in _create_pack_from_packs
    self._copy_text_texts()
  File "/usr/lib/python2.5/site-packages/bzrlib/repofmt/groupcompress_repo.py", line 442, in _copy_text_texts
    'text', self._get_progress_stream, 4)
  File "/usr/lib/python2.5/site-packages/bzrlib/repofmt/groupcompress_repo.py", line 394, in _copy_stream
    reuse_blocks=False):
  File "/usr/lib/python2.5/site-packages/bzrlib/groupcompress.py", line 1451, in _insert_record_stream
    bytes = record.get_bytes_as('fulltext')
  File "/usr/lib/python2.5/site-packages/bzrlib/groupcompress.py", line 419, in get_bytes_as
    self._manager._...

[Jonathan Lange (jml)]

We've landed the fix on our bzr branch, waiting for the reroll.

[Martin Pool (mbp)]

Was released in 1.16.1