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From 307074330db6e9f14941dfbabbe6f299cf841533 Mon Sep 17 00:00:00 2001
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From: karthik-us <ksubrahm@redhat.com>
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Date: Mon, 10 Jun 2019 23:58:16 +0530
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Subject: [PATCH 178/178] Cluster/afr: Don't treat all bricks having metadata
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pending as split-brain
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Backport of: https://review.gluster.org/#/c/glusterfs/+/22831/
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Problem:
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We currently don't have a roll-back/undoing of post-ops if quorum is not met.
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Though the FOP is still unwound with failure, the xattrs remain on the disk.
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Due to these partial post-ops and partial heals (healing only when 2 bricks
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are up), we can end up in metadata split-brain purely from the afr xattrs
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point of view i.e each brick is blamed by atleast one of the others for
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metadata. These scenarios are hit when there is frequent connect/disconnect
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of the client/shd to the bricks.
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Fix:
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Pick a source based on the xattr values. If 2 bricks blame one, the blamed
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one must be treated as sink. If there is no majority, all are sources. Once
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we pick a source, self-heal will then do the heal instead of erroring out
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due to split-brain.
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This patch also adds restriction of all the bricks to be up to perform
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metadata heal to avoid any metadata loss.
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Removed the test case tests/bugs/replicate/bug-1468279-source-not-blaming-sinks.t
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as it was doing metadata heal even when only 2 of 3 bricks were up.
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Change-Id: I02064ecb7d68d498f75a353af64f75249a633508
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fixes: bz#1715438
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Signed-off-by: karthik-us <ksubrahm@redhat.com>
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Reviewed-on: https://code.engineering.redhat.com/gerrit/172935
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Tested-by: RHGS Build Bot <nigelb@redhat.com>
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Reviewed-by: Sunil Kumar Heggodu Gopala Acharya <sheggodu@redhat.com>
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---
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.../bug-1468279-source-not-blaming-sinks.t | 64 ----------
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.../bug-1717819-metadata-split-brain-detection.t | 130 +++++++++++++++++++++
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xlators/cluster/afr/src/afr-self-heal-common.c | 4 +-
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xlators/cluster/afr/src/afr-self-heal-metadata.c | 2 +-
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4 files changed, 133 insertions(+), 67 deletions(-)
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delete mode 100644 tests/bugs/replicate/bug-1468279-source-not-blaming-sinks.t
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create mode 100644 tests/bugs/replicate/bug-1717819-metadata-split-brain-detection.t
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diff --git a/tests/bugs/replicate/bug-1468279-source-not-blaming-sinks.t b/tests/bugs/replicate/bug-1468279-source-not-blaming-sinks.t
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deleted file mode 100644
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index 054a4ad..0000000
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--- a/tests/bugs/replicate/bug-1468279-source-not-blaming-sinks.t
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+++ /dev/null
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@@ -1,64 +0,0 @@
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-#!/bin/bash
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-. $(dirname $0)/../../include.rc
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-. $(dirname $0)/../../volume.rc
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-cleanup;
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-
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-TEST glusterd
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-TEST pidof glusterd
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-TEST $CLI volume create $V0 replica 3 $H0:$B0/${V0}{0,1,2}
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-TEST $CLI volume start $V0
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-TEST $CLI volume set $V0 cluster.self-heal-daemon off
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-TEST $CLI volume set $V0 cluster.metadata-self-heal off
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-TEST $GFS --volfile-id=$V0 --volfile-server=$H0 --attribute-timeout=0 --entry-timeout=0 $M0;
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-TEST touch $M0/file
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-
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-# Kill B1, create a pending metadata heal.
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-TEST kill_brick $V0 $H0 $B0/${V0}0
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-TEST setfattr -n user.xattr -v value1 $M0/file
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-EXPECT "0000000000000010000000" get_hex_xattr trusted.afr.$V0-client-0 $B0/${V0}1/file
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-EXPECT "0000000000000010000000" get_hex_xattr trusted.afr.$V0-client-0 $B0/${V0}2/file
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-
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-# Kill B2, heal from B3 to B1.
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-TEST $CLI volume start $V0 force
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-EXPECT_WITHIN $CHILD_UP_TIMEOUT "1" afr_child_up_status $V0 0
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-TEST kill_brick $V0 $H0 $B0/${V0}1
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-TEST $CLI volume set $V0 cluster.self-heal-daemon on
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-EXPECT_WITHIN $CHILD_UP_TIMEOUT "1" afr_child_up_status_in_shd $V0 2
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-EXPECT_WITHIN $CHILD_UP_TIMEOUT "1" afr_child_up_status_in_shd $V0 0
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-$CLI volume heal $V0
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-EXPECT_WITHIN $HEAL_TIMEOUT "00000000" afr_get_specific_changelog_xattr $B0/${V0}2/file trusted.afr.$V0-client-0 "metadata"
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-TEST $CLI volume set $V0 cluster.self-heal-daemon off
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-
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-# Create another pending metadata heal.
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-TEST setfattr -n user.xattr -v value2 $M0/file
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-EXPECT "0000000000000010000000" get_hex_xattr trusted.afr.$V0-client-1 $B0/${V0}0/file
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-EXPECT "0000000000000010000000" get_hex_xattr trusted.afr.$V0-client-1 $B0/${V0}2/file
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-
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-# Kill B1, heal from B3 to B2
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-TEST $CLI volume start $V0 force
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-EXPECT_WITHIN $CHILD_UP_TIMEOUT "1" afr_child_up_status $V0 1
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-TEST kill_brick $V0 $H0 $B0/${V0}0
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-TEST $CLI volume set $V0 cluster.self-heal-daemon on
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-EXPECT_WITHIN $CHILD_UP_TIMEOUT "1" afr_child_up_status_in_shd $V0 2
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-EXPECT_WITHIN $CHILD_UP_TIMEOUT "1" afr_child_up_status_in_shd $V0 1
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-$CLI volume heal $V0
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-EXPECT_WITHIN $HEAL_TIMEOUT "00000000" afr_get_specific_changelog_xattr $B0/${V0}2/file trusted.afr.$V0-client-1 "metadata"
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-TEST $CLI volume set $V0 cluster.self-heal-daemon off
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-
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-# ALL bricks up again.
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-TEST $CLI volume start $V0 force
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-EXPECT_WITHIN $CHILD_UP_TIMEOUT "1" afr_child_up_status $V0 1
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-EXPECT_WITHIN $PROCESS_UP_TIMEOUT "1" afr_child_up_status $V0 1
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-# B1 and B2 blame each other, B3 doesn't blame anyone.
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-EXPECT "0000000000000010000000" get_hex_xattr trusted.afr.$V0-client-1 $B0/${V0}0/file
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-EXPECT "0000000000000010000000" get_hex_xattr trusted.afr.$V0-client-0 $B0/${V0}1/file
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-EXPECT "0000000000000000000000" get_hex_xattr trusted.afr.$V0-client-0 $B0/${V0}2/file
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-EXPECT "0000000000000000000000" get_hex_xattr trusted.afr.$V0-client-1 $B0/${V0}2/file
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-TEST $CLI volume set $V0 cluster.self-heal-daemon on
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-EXPECT_WITHIN $CHILD_UP_TIMEOUT "1" afr_child_up_status_in_shd $V0 0
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-EXPECT_WITHIN $CHILD_UP_TIMEOUT "1" afr_child_up_status_in_shd $V0 1
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-EXPECT_WITHIN $CHILD_UP_TIMEOUT "1" afr_child_up_status_in_shd $V0 2
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-TEST $CLI volume heal $V0
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-EXPECT_WITHIN $HEAL_TIMEOUT "^0$" get_pending_heal_count $V0
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-
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-cleanup;
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diff --git a/tests/bugs/replicate/bug-1717819-metadata-split-brain-detection.t b/tests/bugs/replicate/bug-1717819-metadata-split-brain-detection.t
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new file mode 100644
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index 0000000..94b8bf3
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--- /dev/null
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+++ b/tests/bugs/replicate/bug-1717819-metadata-split-brain-detection.t
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@@ -0,0 +1,130 @@
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+#!/bin/bash
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+
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+. $(dirname $0)/../../include.rc
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+. $(dirname $0)/../../volume.rc
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+. $(dirname $0)/../../afr.rc
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+
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+cleanup;
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+
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+## Start and create a volume
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+TEST glusterd;
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+TEST pidof glusterd;
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+TEST $CLI volume info;
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+
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+TEST $CLI volume create $V0 replica 3 $H0:$B0/${V0}{0,1,2};
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+TEST $CLI volume start $V0;
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+EXPECT 'Started' volinfo_field $V0 'Status';
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+TEST $CLI volume heal $V0 disable
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+TEST $GFS --volfile-id=/$V0 --volfile-server=$H0 $M0
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+
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+###############################################################################
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+# Case of 2 bricks blaming the third and the third blaming the other two.
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+
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+TEST mkdir $M0/dir
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+
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+# B0 and B2 must blame B1
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+TEST kill_brick $V0 $H0 $B0/$V0"1"
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+TEST setfattr -n user.metadata -v 1 $M0/dir
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+EXPECT "00000001" afr_get_specific_changelog_xattr $B0/${V0}0/dir trusted.afr.$V0-client-1 metadata
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+EXPECT "00000001" afr_get_specific_changelog_xattr $B0/${V0}2/dir trusted.afr.$V0-client-1 metadata
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+CLIENT_XATTR=$(getfattr -n 'user.metadata' --absolute-names --only-values $M0/dir)
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+
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+# B1 must blame B0 and B2
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+setfattr -n trusted.afr.$V0-client-0 -v 0x000000000000000100000000 $B0/$V0"1"/dir
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+setfattr -n trusted.afr.$V0-client-2 -v 0x000000000000000100000000 $B0/$V0"1"/dir
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+
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+# Launch heal
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+TEST $CLI volume start $V0 force
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+EXPECT_WITHIN $PROCESS_UP_TIMEOUT "^1$" brick_up_status $V0 $H0 $B0/${V0}1
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+TEST $CLI volume heal $V0 enable
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+EXPECT_WITHIN $PROCESS_UP_TIMEOUT "^Y$" glustershd_up_status
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+EXPECT_WITHIN $CHILD_UP_TIMEOUT "^1$" afr_child_up_status_in_shd $V0 0
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+EXPECT_WITHIN $CHILD_UP_TIMEOUT "^1$" afr_child_up_status_in_shd $V0 1
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+EXPECT_WITHIN $CHILD_UP_TIMEOUT "^1$" afr_child_up_status_in_shd $V0 2
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+TEST $CLI volume heal $V0
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+EXPECT_WITHIN $HEAL_TIMEOUT "^0$" get_pending_heal_count $V0
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+
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+B0_XATTR=$(getfattr -n 'user.metadata' --absolute-names --only-values $B0/${V0}0/dir)
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+B1_XATTR=$(getfattr -n 'user.metadata' --absolute-names --only-values $B0/${V0}1/dir)
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+B2_XATTR=$(getfattr -n 'user.metadata' --absolute-names --only-values $B0/${V0}2/dir)
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+
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+TEST [ "$CLIENT_XATTR" == "$B0_XATTR" ]
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+TEST [ "$CLIENT_XATTR" == "$B1_XATTR" ]
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+TEST [ "$CLIENT_XATTR" == "$B2_XATTR" ]
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+TEST setfattr -x user.metadata $M0/dir
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+
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+###############################################################################
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+# Case of each brick blaming the next one in a cyclic manner
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+
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+TEST $CLI volume heal $V0 disable
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+TEST `echo "hello" >> $M0/dir/file`
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+# Mark cyclic xattrs and modify metadata directly on the bricks.
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+setfattr -n trusted.afr.$V0-client-1 -v 0x000000000000000100000000 $B0/$V0"0"/dir/file
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+setfattr -n trusted.afr.$V0-client-2 -v 0x000000000000000100000000 $B0/$V0"1"/dir/file
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+setfattr -n trusted.afr.$V0-client-0 -v 0x000000000000000100000000 $B0/$V0"2"/dir/file
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+
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+setfattr -n user.metadata -v 1 $B0/$V0"0"/dir/file
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+setfattr -n user.metadata -v 2 $B0/$V0"1"/dir/file
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+setfattr -n user.metadata -v 3 $B0/$V0"2"/dir/file
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+
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+# Add entry to xattrop dir to trigger index heal.
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+xattrop_dir0=$(afr_get_index_path $B0/$V0"0")
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+base_entry_b0=`ls $xattrop_dir0`
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+gfid_str=$(gf_gfid_xattr_to_str $(gf_get_gfid_xattr $B0/$V0"0"/dir/file))
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+ln $xattrop_dir0/$base_entry_b0 $xattrop_dir0/$gfid_str
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+EXPECT_WITHIN $HEAL_TIMEOUT "^1$" get_pending_heal_count $V0
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+
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+# Launch heal
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+TEST $CLI volume heal $V0 enable
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+TEST $CLI volume heal $V0
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+EXPECT_WITHIN $HEAL_TIMEOUT "^0$" get_pending_heal_count $V0
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+
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+B0_XATTR=$(getfattr -n 'user.metadata' --absolute-names --only-values $B0/${V0}0/dir/file)
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+B1_XATTR=$(getfattr -n 'user.metadata' --absolute-names --only-values $B0/${V0}1/dir/file)
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+B2_XATTR=$(getfattr -n 'user.metadata' --absolute-names --only-values $B0/${V0}2/dir/file)
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+
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+TEST [ "$B0_XATTR" == "$B1_XATTR" ]
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+TEST [ "$B0_XATTR" == "$B2_XATTR" ]
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+TEST rm -f $M0/dir/file
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+
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+###############################################################################
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+# Case of 2 bricks having quorum blaming and the other having only one blaming.
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+
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+TEST $CLI volume heal $V0 disable
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+TEST `echo "hello" >> $M0/dir/file`
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+# B0 and B2 must blame B1
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+TEST kill_brick $V0 $H0 $B0/$V0"1"
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+TEST setfattr -n user.metadata -v 1 $M0/dir/file
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+EXPECT "00000001" afr_get_specific_changelog_xattr $B0/${V0}0/dir/file trusted.afr.$V0-client-1 metadata
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+EXPECT "00000001" afr_get_specific_changelog_xattr $B0/${V0}2/dir/file trusted.afr.$V0-client-1 metadata
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+
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+# B1 must blame B0 and B2
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+setfattr -n trusted.afr.$V0-client-0 -v 0x000000000000000100000000 $B0/$V0"1"/dir/file
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+setfattr -n trusted.afr.$V0-client-2 -v 0x000000000000000100000000 $B0/$V0"1"/dir/file
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+
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+# B0 must blame B2
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+setfattr -n trusted.afr.$V0-client-2 -v 0x000000000000000100000000 $B0/$V0"0"/dir/file
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+
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+# Modify the metadata directly on the bricks B1 & B2.
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+setfattr -n user.metadata -v 2 $B0/$V0"1"/dir/file
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+setfattr -n user.metadata -v 3 $B0/$V0"2"/dir/file
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+
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+# Launch heal
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+TEST $CLI volume start $V0 force
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+EXPECT_WITHIN $PROCESS_UP_TIMEOUT "^1$" brick_up_status $V0 $H0 $B0/${V0}1
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+TEST $CLI volume heal $V0 enable
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+EXPECT_WITHIN $PROCESS_UP_TIMEOUT "^Y$" glustershd_up_status
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+EXPECT_WITHIN $CHILD_UP_TIMEOUT "^1$" afr_child_up_status_in_shd $V0 0
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|
233933 |
+EXPECT_WITHIN $CHILD_UP_TIMEOUT "^1$" afr_child_up_status_in_shd $V0 1
|
|
|
233933 |
+EXPECT_WITHIN $CHILD_UP_TIMEOUT "^1$" afr_child_up_status_in_shd $V0 2
|
|
|
233933 |
+
|
|
|
233933 |
+B0_XATTR=$(getfattr -n 'user.metadata' --absolute-names --only-values $B0/${V0}0/dir/file)
|
|
|
233933 |
+B1_XATTR=$(getfattr -n 'user.metadata' --absolute-names --only-values $B0/${V0}1/dir/file)
|
|
|
233933 |
+B2_XATTR=$(getfattr -n 'user.metadata' --absolute-names --only-values $B0/${V0}2/dir/file)
|
|
|
233933 |
+
|
|
|
233933 |
+TEST [ "$B0_XATTR" == "$B1_XATTR" ]
|
|
|
233933 |
+TEST [ "$B0_XATTR" == "$B2_XATTR" ]
|
|
|
233933 |
+
|
|
|
233933 |
+###############################################################################
|
|
|
233933 |
+
|
|
|
233933 |
+cleanup
|
|
|
233933 |
diff --git a/xlators/cluster/afr/src/afr-self-heal-common.c b/xlators/cluster/afr/src/afr-self-heal-common.c
|
|
|
233933 |
index 595bed4..5157e7d 100644
|
|
|
233933 |
--- a/xlators/cluster/afr/src/afr-self-heal-common.c
|
|
|
233933 |
+++ b/xlators/cluster/afr/src/afr-self-heal-common.c
|
|
|
233933 |
@@ -1590,7 +1590,7 @@ afr_selfheal_find_direction(call_frame_t *frame, xlator_t *this,
|
|
|
233933 |
}
|
|
|
233933 |
}
|
|
|
233933 |
|
|
|
233933 |
- if (type == AFR_DATA_TRANSACTION) {
|
|
|
233933 |
+ if (type == AFR_DATA_TRANSACTION || type == AFR_METADATA_TRANSACTION) {
|
|
|
233933 |
min_participants = priv->child_count;
|
|
|
233933 |
} else {
|
|
|
233933 |
min_participants = AFR_SH_MIN_PARTICIPANTS;
|
|
|
233933 |
@@ -1656,7 +1656,7 @@ afr_selfheal_find_direction(call_frame_t *frame, xlator_t *this,
|
|
|
233933 |
}
|
|
|
233933 |
}
|
|
|
233933 |
|
|
|
233933 |
- if (type == AFR_DATA_TRANSACTION)
|
|
|
233933 |
+ if (type == AFR_DATA_TRANSACTION || type == AFR_METADATA_TRANSACTION)
|
|
|
233933 |
afr_selfheal_post_op_failure_accounting(priv, accused, sources,
|
|
|
233933 |
locked_on);
|
|
|
233933 |
|
|
|
233933 |
diff --git a/xlators/cluster/afr/src/afr-self-heal-metadata.c b/xlators/cluster/afr/src/afr-self-heal-metadata.c
|
|
|
233933 |
index ba43341..ecfa791 100644
|
|
|
233933 |
--- a/xlators/cluster/afr/src/afr-self-heal-metadata.c
|
|
|
233933 |
+++ b/xlators/cluster/afr/src/afr-self-heal-metadata.c
|
|
|
233933 |
@@ -398,7 +398,7 @@ afr_selfheal_metadata(call_frame_t *frame, xlator_t *this, inode_t *inode)
|
|
|
233933 |
ret = afr_selfheal_inodelk(frame, this, inode, this->name, LLONG_MAX - 1, 0,
|
|
|
233933 |
data_lock);
|
|
|
233933 |
{
|
|
|
233933 |
- if (ret < AFR_SH_MIN_PARTICIPANTS) {
|
|
|
233933 |
+ if (ret < priv->child_count) {
|
|
|
233933 |
ret = -ENOTCONN;
|
|
|
233933 |
goto unlock;
|
|
|
233933 |
}
|
|
|
233933 |
--
|
|
|
233933 |
1.8.3.1
|
|
|
233933 |
|