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Diffstat (limited to 'tests/bugs/glusterfs/bug-853690.t')
-rwxr-xr-x | tests/bugs/glusterfs/bug-853690.t | 91 |
1 files changed, 91 insertions, 0 deletions
diff --git a/tests/bugs/glusterfs/bug-853690.t b/tests/bugs/glusterfs/bug-853690.t new file mode 100755 index 00000000000..d81be011438 --- /dev/null +++ b/tests/bugs/glusterfs/bug-853690.t @@ -0,0 +1,91 @@ +#!/bin/bash +# +# Bug 853690 - Test that short writes do not lead to corruption. +# +# Mismanagement of short writes in AFR leads to corruption and immediately +# detectable split-brain. Write a file to a replica volume using error-gen +# to cause short writes on one replica. +# +# Short writes are also possible during heal. If ignored, the files are marked +# consistent and silently differ. After reading the file, cause a lookup, wait +# for self-heal and verify that the afr xattrs do not match. +# +######## + +. $(dirname $0)/../../include.rc +. $(dirname $0)/../../volume.rc + +cleanup; + +TEST mkdir -p $B0/test{1,2} + +# Our graph is a two brick replica with 100% frequency of short writes on one +# side of the replica. This guarantees a single write fop leads to an out-of-sync +# situation. +cat > $B0/test.vol <<EOF +volume test-posix-0 + type storage/posix + option directory $B0/test1 +end-volume + +volume test-error-0 + type debug/error-gen + option failure 100 + option enable writev + option error-no GF_ERROR_SHORT_WRITE + subvolumes test-posix-0 +end-volume + +volume test-locks-0 + type features/locks + subvolumes test-error-0 +end-volume + +volume test-posix-1 + type storage/posix + option directory $B0/test2 +end-volume + +volume test-locks-1 + type features/locks + subvolumes test-posix-1 +end-volume + +volume test-replicate-0 + type cluster/replicate + option background-self-heal-count 0 + subvolumes test-locks-0 test-locks-1 +end-volume +EOF + +TEST glusterd + +TEST glusterfs --volfile=$B0/test.vol --attribute-timeout=0 --entry-timeout=0 $M0 + +# Send a single write, guaranteed to be short on one replica, and attempt to +# read the data back. Failure to detect the short write results in different +# file sizes and immediate split-brain (EIO). +TEST dd if=/dev/zero of=$M0/file bs=128k count=1 +TEST dd if=$M0/file of=/dev/null bs=128k count=1 +######## +# +# Test self-heal with short writes... +# +######## + +# Cause a lookup and wait a few seconds for posterity. This self-heal also fails +# due to a short write. +TEST ls $M0/file +# Verify the attributes on the healthy replica do not reflect consistency with +# the other replica. +xa=`getfattr -n trusted.afr.test-locks-0 -e hex $B0/test2/file 2>&1 | grep = | cut -f2 -d=` +EXPECT_NOT 0x000000000000000000000000 echo $xa + +TEST rm -f $M0/file +EXPECT_WITHIN $UMOUNT_TIMEOUT "Y" force_umount $M0 + +rm -f $B0/test.vol +rm -rf $B0/test1 $B0/test2 + +cleanup; + |