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Asked: 2026-05-20T02:10:47+00:00

The ZODB blobstorage directory contains a .layout file with the string ‘lawn’, ‘bushy’. What

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The ZODB blobstorage directory contains a .layout file with the string ‘lawn’, ‘bushy’.

What is the difference between the various blob storage directory formats?

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  1. Editorial Team

    It is explained here: https://github.com/zopefoundation/ZODB/blob/master/src/ZODB/tests/blob_layout.txt

    FTA:

    ======================
    Blob directory layouts

    The internal structure of the blob directories is governed by so called
    layouts. The current default layout is called bushy.

    The original blob implementation used a layout that we now call lawn and
    which is still available for backwards compatibility.

    Layouts implement two methods: one for computing a relative path for an
    OID and one for turning a relative path back into an OID.

    Our terminology is roughly the same as used in DirectoryStorage.

    It also explains the formats in detail.

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