[Tarantool-patches] [PATCH rfc v2] memtx: fix out of memory handling for rtree
Olga Arkhangelskaia
arkholga at tarantool.org
Mon Dec 9 16:48:51 MSK 2019
When tarantool tries to recover rtree from a snapshot and memtx_memory value is
lower than it has been when the snapshot was created, server suffers from
segmentation fault. This happens because there is no out of memory error
handling in rtree lib. In another words, we do not check the result of
malloc operation.
To prevent this behaviour we simply reserve memory before replace operation for
rtree. And if there is not enough memory to be reserved - server will fail
gently with the "Failed to allocate" error message.
Closes #4619
---
Branch: https://github.com/tarantool/tarantool/tree/OKriw/gh-RTREE-doesnt-handle-OOM-properly
Issue:https://github.com/tarantool/tarantool/issues/4619
v1:https://lists.tarantool.org/pipermail/tarantool-patches/2019-November/012391.html
Changes in v2:
- changed way of error handling, now we reserve pages before go to rtree
lib
- changed test
- changed commit msg
src/box/memtx_engine.h | 12 +++++
src/box/memtx_rtree.c | 7 +++
src/box/memtx_space.c | 12 -----
test/box/cfg.result | 101 +++++++++++++++++++++++++++++++++++++++++
test/box/cfg.test.lua | 28 ++++++++++++
5 files changed, 148 insertions(+), 12 deletions(-)
diff --git a/src/box/memtx_engine.h b/src/box/memtx_engine.h
index fcf595e79..fc6aa083e 100644
--- a/src/box/memtx_engine.h
+++ b/src/box/memtx_engine.h
@@ -87,6 +87,18 @@ enum memtx_recovery_state {
/** Memtx extents pool, available to statistics. */
extern struct mempool memtx_index_extent_pool;
+enum memtx_reserve_extents_num{
+ /**
+ * This number is calculated based on the
+ * max (realistic) number of insertions
+ * a deletion from a B-tree or an R-tree
+ * can lead to, and, as a result, the max
+ * number of new block allocations.
+ */
+ RESERVE_EXTENTS_BEFORE_DELETE = 8,
+ RESERVE_EXTENTS_BEFORE_REPLACE = 16
+};
+
/**
* The size of the biggest memtx iterator. Used with
* mempool_create. This is the size of the block that will be
diff --git a/src/box/memtx_rtree.c b/src/box/memtx_rtree.c
index 8badad797..799438241 100644
--- a/src/box/memtx_rtree.c
+++ b/src/box/memtx_rtree.c
@@ -227,6 +227,13 @@ memtx_rtree_index_replace(struct index *base, struct tuple *old_tuple,
(void)mode;
struct memtx_rtree_index *index = (struct memtx_rtree_index *)base;
struct rtree_rect rect;
+ /* There is no error handling in rtree lib. We need to be sure that
+ * alloc does not fail.
+ */
+ struct memtx_engine *memtx = (struct memtx_engine *)base->engine;
+ if (memtx_index_extent_reserve(memtx,
+ RESERVE_EXTENTS_BEFORE_REPLACE) != 0)
+ return -1;
if (new_tuple) {
if (extract_rectangle(&rect, new_tuple, base->def) != 0)
return -1;
diff --git a/src/box/memtx_space.c b/src/box/memtx_space.c
index cf29cf328..300417001 100644
--- a/src/box/memtx_space.c
+++ b/src/box/memtx_space.c
@@ -103,18 +103,6 @@ memtx_space_replace_no_keys(struct space *space, struct tuple *old_tuple,
return -1;
}
-enum {
- /**
- * This number is calculated based on the
- * max (realistic) number of insertions
- * a deletion from a B-tree or an R-tree
- * can lead to, and, as a result, the max
- * number of new block allocations.
- */
- RESERVE_EXTENTS_BEFORE_DELETE = 8,
- RESERVE_EXTENTS_BEFORE_REPLACE = 16
-};
-
/**
* A short-cut version of replace() used during bulk load
* from snapshot.
diff --git a/test/box/cfg.result b/test/box/cfg.result
index 5370bb870..4ed8c9efe 100644
--- a/test/box/cfg.result
+++ b/test/box/cfg.result
@@ -580,3 +580,104 @@ test_run:cmd("cleanup server cfg_tester6")
| ---
| - true
| ...
+
+--
+-- gh-4619-RTREE-doesn't-handle-OOM-properly
+--
+test_run:cmd('create server rtree with script = "box/lua/cfg_test1.lua"')
+ | ---
+ | - true
+ | ...
+test_run:cmd("start server rtree")
+ | ---
+ | - true
+ | ...
+test_run:cmd('switch rtree')
+ | ---
+ | - true
+ | ...
+box.cfg{memtx_memory = 3221225472}
+ | ---
+ | ...
+math = require("math")
+ | ---
+ | ...
+rtreespace = box.schema.create_space('rtree', {if_not_exists = true})
+ | ---
+ | ...
+rtreespace:create_index('pk', {if_not_exists = true})
+ | ---
+ | - unique: true
+ | parts:
+ | - type: unsigned
+ | is_nullable: false
+ | fieldno: 1
+ | id: 0
+ | space_id: 512
+ | type: TREE
+ | name: pk
+ | ...
+rtreespace:create_index('target', {type='rtree', dimension = 3, parts={2, 'array'},unique = false, if_not_exists = true,})
+ | ---
+ | - parts:
+ | - type: array
+ | is_nullable: false
+ | fieldno: 2
+ | dimension: 3
+ | id: 1
+ | type: RTREE
+ | space_id: 512
+ | name: target
+ | ...
+count = 2e6
+ | ---
+ | ...
+for i = 1, count do box.space.rtree:insert{i, {(i + 1) -\
+ math.floor((i + 1)/7000) * 7000, (i + 2) - math.floor((i + 2)/7000) * 7000,\
+ (i + 3) - math.floor((i + 3)/7000) * 7000}} end
+ | ---
+ | ...
+rtreespace:count()
+ | ---
+ | - 2000000
+ | ...
+box.snapshot()
+ | ---
+ | - ok
+ | ...
+test_run:cmd('switch default')
+ | ---
+ | - true
+ | ...
+test_run:cmd("stop server rtree")
+ | ---
+ | - true
+ | ...
+test_run:cmd("start server rtree with crash_expected=True")
+ | ---
+ | - false
+ | ...
+fio = require('fio')
+ | ---
+ | ...
+fh = fio.open(fio.pathjoin(fio.cwd(), 'cfg_test1.log'), {'O_RDONLY'})
+ | ---
+ | ...
+size = fh:seek(0, 'SEEK_END')
+ | ---
+ | ...
+fh:seek(-256, 'SEEK_END')
+ | ---
+ | - 11155
+ | ...
+line = fh:read(256)
+ | ---
+ | ...
+fh:close()
+ | ---
+ | - true
+ | ...
+string.match(line, 'Failed to allocate') ~= nil
+ | ---
+ | - true
+ | ...
diff --git a/test/box/cfg.test.lua b/test/box/cfg.test.lua
index 56ccb6767..b13f10c65 100644
--- a/test/box/cfg.test.lua
+++ b/test/box/cfg.test.lua
@@ -141,3 +141,31 @@ test_run:cmd("start server cfg_tester6")
test_run:grep_log('cfg_tester6', 'set \'vinyl_memory\' configuration option to 1073741824', 1000)
test_run:cmd("stop server cfg_tester6")
test_run:cmd("cleanup server cfg_tester6")
+
+--
+-- gh-4619-RTREE-doesn't-handle-OOM-properly
+--
+test_run:cmd('create server rtree with script = "box/lua/cfg_test1.lua"')
+test_run:cmd("start server rtree")
+test_run:cmd('switch rtree')
+box.cfg{memtx_memory = 3221225472}
+math = require("math")
+rtreespace = box.schema.create_space('rtree', {if_not_exists = true})
+rtreespace:create_index('pk', {if_not_exists = true})
+rtreespace:create_index('target', {type='rtree', dimension = 3, parts={2, 'array'},unique = false, if_not_exists = true,})
+count = 2e6
+for i = 1, count do box.space.rtree:insert{i, {(i + 1) -\
+ math.floor((i + 1)/7000) * 7000, (i + 2) - math.floor((i + 2)/7000) * 7000,\
+ (i + 3) - math.floor((i + 3)/7000) * 7000}} end
+rtreespace:count()
+box.snapshot()
+test_run:cmd('switch default')
+test_run:cmd("stop server rtree")
+test_run:cmd("start server rtree with crash_expected=True")
+fio = require('fio')
+fh = fio.open(fio.pathjoin(fio.cwd(), 'cfg_test1.log'), {'O_RDONLY'})
+size = fh:seek(0, 'SEEK_END')
+fh:seek(-256, 'SEEK_END')
+line = fh:read(256)
+fh:close()
+string.match(line, 'Failed to allocate') ~= nil
--
2.20.1 (Apple Git-117)
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