svn commit: r1073749 - /subversion/trunk/notes/wc-ng/pristine-store

[da...@apache.org]

Author: danielsh
Date: Wed Feb 23 14:04:24 2011
New Revision: 1073749

URL: http://svn.apache.org/viewvc?rev=1073749&view=rev
Log:
* notes/wc-ng/pristine-store: Add a concurrency reminder and remove a typo.

Modified:
    subversion/trunk/notes/wc-ng/pristine-store

Modified: subversion/trunk/notes/wc-ng/pristine-store
URL: http://svn.apache.org/viewvc/subversion/trunk/notes/wc-ng/pristine-store?rev=1073749&r1=1073748&r2=1073749&view=diff
==============================================================================
--- subversion/trunk/notes/wc-ng/pristine-store (original)
+++ subversion/trunk/notes/wc-ng/pristine-store Wed Feb 23 14:04:24 2011
@@ -77,6 +77,9 @@ rationale.)
        pristine text is in the store and its metadata is in the row; if
        not, the pristine text is not currently in the store.
 
+       NOTE: If the reader doesn't have an appropriate lock, the pristine
+       text may be removed from the store at any later time.
+
 (d) To read a pristine text, the reader must:
     1. Query the SDB and open the file within the same SDB txn (to ensure
        that no pristine-remove txn (A-3(b)) is in progress at the same
@@ -125,7 +128,7 @@ rationale.)
 
 (c) In both the 'add' (a) and 'remove' (b) txns, we need to acquire a lock
     that blocks both readers and writers (an SQLite 'RESERVED' lock)
-    before adding or removing the file on disk.  We could aquire this
+    before adding or removing the file on disk.  We could acquire this
     explicitly (e.g. by starting the txn with 'BEGIN IMMEDIATE');
     alternatively SQLite will upgrade the default 'SHARED' lock to
     'RESERVED' the first time we write to a table.