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authorPranith Kumar K <pranithk@gluster.com>2012-04-14 14:33:53 +0530
committerAnand Avati <avati@redhat.com>2012-05-18 20:30:30 -0700
commitfa90243e20eeef91eda5a5bb249bed05066852e3 (patch)
tree7add1693e67dc25e69b8c1f8ed6d6e096c84461f /xlators/cluster/afr/src/afr.h
parent24c1cbf4f7afd54a506a8265de9d22ce2b2e670f (diff)
cluster/afr: Enforce order in pre/post op
The xattrop order in pre/post op on all the subvols is client-0, client-1... client-n where n is (replica-count - 1). This order can lead to invalid split-brains if the brick dies in the middle of xattrops. Example: transaction completed pre-op, so on all the subvolumes xattrs have '1' changelog. Now post-op is sent to both the subvols. On subvol-0 change-log of client-0 is decremented to 0, before decrementing change-log of client-1 to 0 the brick dies. This change-log status on subvol-0 gives the meaning that a change is done on subvol-0 successfully but on subvol-1 it failed. Which is not what happened. Changes done when the subvol-0 was down will lead to pending change-log on subvol-1 for subvol-0. Which is correct. When the subvol-0 is brought back up, the change-log will be in split-brain state even when it is not a legitimate split-brain. If the brick dies in the middle of xattrops it should remain fool. Pre-op should perform xattrop of the local change-log first and post-op should perform xattrop of the local change-log last. In case of optimistic changelogs txn_changelog should be done last on local if it succeeds, first if it fails. Change-Id: Ib6eeb20cdc49b0b1fd2f454f25a9c8e08388c6e7 BUG: 765194 Signed-off-by: Pranith Kumar K <pranithk@gluster.com> Reviewed-on: http://review.gluster.com/3226 Tested-by: Gluster Build System <jenkins@build.gluster.com> Reviewed-by: Anand Avati <avati@redhat.com>
Diffstat (limited to 'xlators/cluster/afr/src/afr.h')
-rw-r--r--xlators/cluster/afr/src/afr.h7
1 files changed, 1 insertions, 6 deletions
diff --git a/xlators/cluster/afr/src/afr.h b/xlators/cluster/afr/src/afr.h
index dfad29de117..27cb83a5791 100644
--- a/xlators/cluster/afr/src/afr.h
+++ b/xlators/cluster/afr/src/afr.h
@@ -670,12 +670,7 @@ typedef struct _afr_local {
afr_transaction_type type;
- int success_count;
- int erase_pending;
- int failure_count;
-
- int last_tried;
- int32_t *child_errno;
+ int32_t **txn_changelog;//changelog after pre+post ops
unsigned char *pre_op;
call_frame_t *main_frame;