From cae76bad7a31c60a3bf17fa1e5005ec5975bf91e Mon Sep 17 00:00:00 2001 From: Ravishankar N Date: Fri, 5 Feb 2016 15:10:06 +0530 Subject: afr:Don't wind reads for files in metadata split-brain Backport of http://review.gluster.org/#/c/13389/ Problem: For a read on a file in metadata split-brain: 1.lookup_done resets event_generation to zero. 2. readv is issued, goes to inode refresh due to mismatching event_gen. 3. After refresh is successful, we update event_generation, data and metdata readable. 3. We then call afr_read_txn_refresh_done() which in turn calls afr_inode_get_readable() but doesn't check for EIO. So afr_readv_wind is called with local->readable (which is populated with data_readable), thus winding the read to a brick. 4. Also, further parallel reads that come directly go to the wind path because there is no inode_refresh needed. Fix: 1.For any afr_read_txn(), readable must be an intersection of data and metadata readable. 2.Check for EIO in afr_read_txn_refresh_done(). Change-Id: I22dd221fdfaf96d7aced2f474e28ed1337d69f0e BUG: 1349879 Signed-off-by: Ravishankar N (cherry picked from commit 7a1c1e2904701496968ed14b6d7479fb706c3188) Reviewed-on: http://review.gluster.org/14790 Smoke: Gluster Build System NetBSD-regression: NetBSD Build System CentOS-regression: Gluster Build System Reviewed-by: Pranith Kumar Karampuri --- tests/bugs/replicate/bug-977797.t | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) (limited to 'tests/bugs/replicate/bug-977797.t') diff --git a/tests/bugs/replicate/bug-977797.t b/tests/bugs/replicate/bug-977797.t index 72c616ba68e..ea9a98adc23 100755 --- a/tests/bugs/replicate/bug-977797.t +++ b/tests/bugs/replicate/bug-977797.t @@ -53,7 +53,9 @@ TEST chmod 757 $M0/a/file TEST $CLI volume start $V0 force EXPECT_WITHIN $CHILD_UP_TIMEOUT "1" afr_child_up_status $V0 1; -TEST dd if=$M0/a/file of=/dev/null bs=1024k +dd if=$M0/a/file of=/dev/null bs=1024k +#read fails, but heal is triggered. +TEST [ $? -ne 0 ] EXPECT_WITHIN $HEAL_TIMEOUT "00000000" \ afr_get_specific_changelog_xattr $B0/$V0"1"/a/file trusted.afr.$V0-client-0 "data" -- cgit