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docs/internals: note segment size limitation

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Marian Beermann 2017-08-22 17:48:48 +02:00
parent 1ac49380b1
commit 10a7b6b727
1 changed files with 4 additions and 1 deletions
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docs/internals/data-structures.rst
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@ -96,7 +96,7 @@ files manually.
A segment starts with a magic number (``BORG_SEG`` as an eight byte ASCII string), A segment starts with a magic number (``BORG_SEG`` as an eight byte ASCII string),
followed by a number of log entries. Each log entry consists of: followed by a number of log entries. Each log entry consists of:
* size of the entry * 32-bit size of the entry
* CRC32 of the entire entry (for a PUT this includes the data) * CRC32 of the entire entry (for a PUT this includes the data)
* entry tag: PUT, DELETE or COMMIT * entry tag: PUT, DELETE or COMMIT
* PUT and DELETE follow this with the 32 byte key * PUT and DELETE follow this with the 32 byte key
@ -118,6 +118,9 @@ When a repository is opened any ``PUT`` or ``DELETE`` operations not
followed by a ``COMMIT`` tag are discarded since they are part of a followed by a ``COMMIT`` tag are discarded since they are part of a
partial/uncommitted transaction. partial/uncommitted transaction.
The size of individual segments is limited to 4 GiB, since the offset of entries
within segments is stored in a 32-bit unsigned integer in the repository index.
Index, hints and integrity Index, hints and integrity
~~~~~~~~~~~~~~~~~~~~~~~~~~ ~~~~~~~~~~~~~~~~~~~~~~~~~~