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Coin database checks #2145

merged 3 commits into from Jan 11, 2013
Commits on Jan 3, 2013
  1. Make DisconnectBlock fault-tolerant

    sipa committed Dec 30, 2012
  2. Add checksums to undo data

    sipa committed Dec 30, 2012
    This should be compatible with older code that didn't write checksums.
Commits on Jan 4, 2013
  1. New database check routine

    sipa committed Jan 3, 2013
    -checklevel gets a new meaning:
    0: verify blocks can be read from disk (like before)
    1: verify (contextless) block validity (like before)
    2: verify undo files can be read and have good checksums
    3: verify coin database is consistent with the last few blocks
       (close to level 6 before)
    4: verify all validity rules of the last few blocks
    Level 3 is the new default, as it's reasonably fast. As level 3 and
    4 are implemented using an in-memory rollback of the database, they
    are limited to as many blocks as possible without exceeding the
    limits set by -dbcache. The default of -dbcache=25 allows for some
    150-200 blocks to be rolled back.
    In case an error is found, the application quits with a message
    instructing the user to restart with -reindex. Better instructions,
    and automatic recovery (when possible) or automatic reindexing are
    left as future work.