[Checkins] [zopefoundation/ZODB] 3807ac: fstail: print the txn offset and header size, inst...

[GitHub]

  Branch: refs/heads/fstail-offset
  Home:   https://github.com/zopefoundation/ZODB
  Commit: 3807ace862f54a244a7658242bc50ea55ef40e83
      https://github.com/zopefoundation/ZODB/commit/3807ace862f54a244a7658242bc50ea55ef40e83
  Author: Julien Muchembled <jm at nexedi.com>
  Date:   2016-07-12 (Tue, 12 Jul 2016)

  Changed paths:
    M src/ZODB/fstools.py
    M src/ZODB/scripts/fstail.py
    M src/ZODB/scripts/tests/fstail.txt
    M src/ZODB/scripts/tests/test_doc.py

  Log Message:
  -----------
  fstail: print the txn offset and header size, instead of only the data offset

Before:

    2016-07-01 09:41:50.416574: hash=d7101c5ee7b8e412d7b6d54873204421e09b7f34
    user='' description='' length=1629 offset=58990284

After:

    2016-07-01 09:41:50.416574: hash=d7101c5ee7b8e412d7b6d54873204421e09b7f34
    user='' description='' length=1629 offset=58990261 (+23)

The structure of a FileStorage DB is such that it's easy to revert the last
transactions, by truncating the file at the right offset. With the above
change, `fstail` can now be used to get this offset.

In the above example:

    truncate -s 58990261 Data.fs

would delete the transaction and all those after.


  Commit: 4392f902a066d0746cd9d682648f5f3bd0af812b
      https://github.com/zopefoundation/ZODB/commit/4392f902a066d0746cd9d682648f5f3bd0af812b
  Author: Julien Muchembled <jm at nexedi.com>
  Date:   2016-07-13 (Wed, 13 Jul 2016)

  Changed paths:
    M CHANGES.rst

  Log Message:
  -----------
  Changelog for PR #88


Compare: https://github.com/zopefoundation/ZODB/compare/cec4ba761260...4392f902a066