src/doc: remove anchortable.txt

The anchor table is long gone.

Signed-off-by: John Spray <john.spray@redhat.com>

diff --git a/src/doc/anchortable.txt b/src/doc/anchortable.txt
deleted file mode 100644 (file)
index d9c0fef..0000000
--- a/src/doc/anchortable.txt
+++ /dev/null
@@ -1,54 +0,0 @@
-
-ANCHOR TABLE PROTOCOL
-
-MDS sends an update PREPARE to the anchortable MDS.  The prepare is
-identified by the ino and operation type; only one for each type
-(create, update, destroy) can be pending at any time.  Both parties
-may actually be the same local node, but for simplicity we treat that
-situation the same.  (That is, we act as if they may fail
-independently, even if they can't.)
-
-The anchortable journals the proposed update, and responds with an
-AGREE and a version number.  This uniquely identifies the request.
-
-The MDS can then update the filesystem metadata however it sees fit.  
-When it is finished (and the results journaled), it sends a COMMIT to
-the anchortable.  The table journals the commit, frees any state from
-the transaction, and sends an ACK.  The initiating MDS should then
-journal the ACK to complete the transaction.
-
-
-ANCHOR TABLE FAILURE
-
-If the AT fails before journaling the PREPARE and sending the AGREE,
-the initiating MDS will simply retry the request.
-
-If the AT fails after journaling PREPARE but before journaling COMMIT,
-it will resend AGREE to the initiating MDS.
-
-If the AT fails after the COMMIT, the transaction has been closed, and it
-takes no action.  If it receives a COMMIT for which it has no open
-transaction, it will reply with ACK.
-
-
-INITIATING MDS FAILURE
-
-If the MDS fails before the metadata update has been journaled, no
-action is taken, since nothing is known about the previously proposed
-transaction.  If an AGREE message is received and there is no
-corresponding PREPARE or pending-commit state, and ROLLBACK is sent to
-the anchor table.
-
-If the MDS fails after journaling the metadata update but before
-journaling the ACK, it resends COMMIT to the anchor table.  If it
-receives an AGREE after resending the COMMIT, it simply ignores the
-AGREE.  The anchortable will respond with an ACK, allowing the
-initiating MDS to journal the final ACK and close out the transaction
-locally.  
-
-On journal replay, each metadata update (EMetaBlob) encountered that
-includes an anchor transaction is noted in the AnchorClient by adding
-it to the pending_commit list, and each journaled ACK is removed from
-that list.  Journal replay may enounter ACKs with no prior metadata
-update; these are ignored.  When recovery finishes, a COMMIT is sent
-for all outstanding transactions.