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[t:2785] Correct comments in block_table to properly describe checkpointing

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git-svn-id: file:///svn/toku/tokudb@22014 c7de825b-a66e-492c-adef-691d508d4ae1
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Yoni Fogel 2013-04-16 23:59:20 -04:00
parent 79db8f76cd
commit c2162500af
1 changed files with 5 additions and 2 deletions
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7
newbrt/block_table.c
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@ -44,12 +44,15 @@ static const DISKOFF diskoff_unused = (DISKOFF)-2; // value of block_translati
*
* checkpointed Is initialized by deserializing from disk,
* and is the only version ever read from disk.
* It is immutable. Once read from disk it is never changed.
* When read from disk it is copied to current.
* It is immutable. It can be replaced by an inprogress btt.
*
* inprogress Is only filled by copying from current,
* and is the only version ever serialized to disk.
* (It is serialized to disk on checkpoint and clean shutdown.)
* It is immutable. Once copied from current it is never changed.
* At end of checkpoint it replaces 'checkpointed'.
* During a checkpoint, any 'pending' dirty writes will update
* inprogress.
*
* current Is initialized by copying from checkpointed,
* is the only version ever modified while the database is in use,