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fix: Temporary fix for loading plain lists

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**The Issue**

We do not serialize lists in PLAIN format well today. We're working on
getting it right, but existing wire format simply doesn't work.

**The (temporary) fix**

This PR attempts to load lists as usual, but upon failure it reverts to
loading a plain list format. This is not a perfect solution, and in some
extreme edge cases it could fail. But.. it's temporary.
This commit is contained in:
shahar 2024-10-10 16:16:03 +03:00
parent 4785767661
commit 4959bef8d1
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GPG key ID: 2ED7F7EDC7FDCCA4
2 changed files with 24 additions and 6 deletions
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9
src/server/list_family_test.cc
View file

@ -372,6 +372,15 @@ TEST_F(ListFamilyTest, LRem) {
ASSERT_THAT(Run({"lrem", "nexists", "0", "elem"}), IntArg(0));
}
TEST_F(ListFamilyTest, DumpRestorePlain) {
const string kValue(10'000, '#');
EXPECT_EQ(CheckedInt({"LPUSH", kKey1, kValue}), 1);
auto buffer = Run({"DUMP", kKey1}).GetBuf();
EXPECT_EQ(Run({"RESTORE", kKey2, "0", ToSV(buffer)}), "OK");
EXPECT_EQ(CheckedInt({"LLEN", kKey2}), 1);
EXPECT_EQ(Run({"LRANGE", kKey2, "0", "1"}), kValue);
}
TEST_F(ListFamilyTest, LTrim) {
Run({"rpush", kKey1, "a", "b", "c", "d"});
ASSERT_EQ(Run({"ltrim", kKey1, "-2", "-1"}), "OK");

21
src/server/rdb_load.cc
View file

@ -722,13 +722,19 @@ void RdbLoaderBase::OpaqueObjLoader::CreateList(const LoadTrace* ltrace) {
if (ec_)
return false;
uint8_t* lp = nullptr;
auto load_plain = [&]() {
lp = (uint8_t*)zmalloc(sv.size());
::memcpy(lp, (uint8_t*)sv.data(), sv.size());
quicklistAppendPlainNode(ql, lp, sv.size());
};
if (container == QUICKLIST_NODE_CONTAINER_PLAIN) {
quicklistAppendPlainNode(ql, (uint8_t*)sv.data(), sv.size());
load_plain();
return true;
}
uint8_t* lp = nullptr;
if (rdb_type_ == RDB_TYPE_LIST_QUICKLIST_2) {
uint8_t* src = (uint8_t*)sv.data();
if (!lpValidateIntegrity(src, sv.size(), 0, nullptr, nullptr)) {
@ -747,10 +753,13 @@ void RdbLoaderBase::OpaqueObjLoader::CreateList(const LoadTrace* ltrace) {
lp = lpNew(sv.size());
if (!ziplistValidateIntegrity((uint8_t*)sv.data(), sv.size(), 1,
ziplistEntryConvertAndValidate, &lp)) {
LOG(ERROR) << "Ziplist integrity check failed: " << sv.size();
zfree(lp);
ec_ = RdbError(errc::rdb_file_corrupted);
return false;
// TODO: Revert loading plain format here once we fix serialization size.
// LOG(ERROR) << "Ziplist integrity check failed: " << sv.size();
// ec_ = RdbError(errc::rdb_file_corrupted);
// return false;
load_plain();
return true;
}
/* Silently skip empty ziplists, if we'll end up with empty quicklist we'll fail later. */