A corrupt index

[Adam Sjøgren]

  Hi,


We have an index which is around 1.1 TB on disk, which has started
giving an error when I try to replace or delete a single, specific
document:

    [M] DELETE DOCUMENT FROM INDEX 10491876
    Operation "eq": no method found,
            left argument in overloaded package Search::Xapian::DatabaseError,
            right argument has no overloaded magic at /usr/share/perl5/MCE/Signal.pm line 306, <__ANONIO__> line 1290.

Running xapian-check gives:

    $ xapian-check ./index
    record:
    baseA blocksize=8K items=10442915 lastblock=221214 revision=5434326 levels=3 root=1332
    B-tree checked okay
    record table structure checked OK

    termlist:
    baseA blocksize=8K items=20885830 lastblock=10207839 revision=5434326 levels=3 root=7090
    Failed to check B-tree: DatabaseError: Key >= right dividing key in level above
    postlist:
    baseA blocksize=8K items=827807972 lastblock=17007553 revision=5434326 levels=4 root=755
    B-tree checked okay
    postlist table structure checked OK

    position:
    baseA blocksize=8K items=13525517523 lastblock=118173891 revision=5434326 levels=4 root=6551
    Failed to check B-tree: DatabaseError: Table entry count says 13525517523 but actually counted 13525517278
    spelling:
    Lazily created, and not yet used.

    synonym:
    Lazily created, and not yet used.

    Total errors found: 2

Is there any chance to fix this without starting over?

If I can just delete some thousands of documents and redo those, it
would be much better for me than having to recreate the entire index.

(We have had some problems recently with the introduction of a new kind
of error, making the indexing program crash in "interesting" ways, so I
am not in doubt that this is a "self-inflicted wound").

I think the index is chert (there is an 'iamchert' file), it's on an
Ubuntu 18.04 server with libxapian30 1.4.5-1ubuntu0.1.


  Best regards,

    Adam

-- 
 "It's the Disneyland-law                                   Adam Sjøgren
  So far out it makes anarchy a bore"                  asjo at koldfront.dk