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authorRavishankar N <ravishankar@redhat.com>2016-02-05 15:10:06 +0530
committerPranith Kumar Karampuri <pkarampu@redhat.com>2016-06-24 04:26:01 -0700
commit7a1c1e2904701496968ed14b6d7479fb706c3188 (patch)
tree8322bbab49c56e19246ee1bde1e8a67edb058065 /rpc
parentbeaa5d104a3eec1b0b87fac648b028f77fc2e80b (diff)
afr:Don't wind reads for files in metadata split-brain
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: 1305031 Signed-off-by: Ravishankar N <ravishankar@redhat.com> Reviewed-on: http://review.gluster.org/13389 Reviewed-by: Ashish Pandey <aspandey@redhat.com> Smoke: Gluster Build System <jenkins@build.gluster.org> NetBSD-regression: NetBSD Build System <jenkins@build.gluster.org> CentOS-regression: Gluster Build System <jenkins@build.gluster.org> Reviewed-by: Pranith Kumar Karampuri <pkarampu@redhat.com>
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