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foundationdb/fdbclient/StorageServerInterface.cpp

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/*
* StorageServerInterface.cpp
*
* This source file is part of the FoundationDB open source project
*
* Copyright 2013-2018 Apple Inc. and the FoundationDB project authors
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
// TODO this should really be renamed "TSSComparison.cpp"
#include "fdbclient/StorageServerInterface.h"
#include "fdbclient/BlobWorkerInterface.h"
#include "flow/crc32c.h" // for crc32c_append, to checksum values in tss trace events
// Includes template specializations for all tss operations on storage server types.
// New StorageServerInterface reply types must be added here or it won't compile.
// if size + hex of checksum is shorter than value, record that instead of actual value. break-even point is 12
// characters
std::string traceChecksumValue(const ValueRef& s) {
return s.size() > 12 ? format("(%d)%08x", s.size(), crc32c_append(0, s.begin(), s.size())) : s.toString();
}
// point reads
template <>
bool TSS_doCompare(const GetValueReply& src, const GetValueReply& tss) {
return src.value.present() == tss.value.present() && (!src.value.present() || src.value.get() == tss.value.get());
}
template <>
const char* TSS_mismatchTraceName(const GetValueRequest& req) {
return "TSSMismatchGetValue";
}
template <>
void TSS_traceMismatch(TraceEvent& event,
const GetValueRequest& req,
const GetValueReply& src,
const GetValueReply& tss) {
event.detail("Key", req.key.printable())
.detail("Tenant", req.tenantInfo.name)
.detail("Version", req.version)
.detail("SSReply", src.value.present() ? traceChecksumValue(src.value.get()) : "missing")
.detail("TSSReply", tss.value.present() ? traceChecksumValue(tss.value.get()) : "missing");
}
// key selector reads
template <>
bool TSS_doCompare(const GetKeyReply& src, const GetKeyReply& tss) {
// This process is a bit complicated. Since the tss and ss can return different results if neighboring shards to
// req.sel.key are currently being moved, We validate that the results are the same IF the returned key selectors
// are final. Otherwise, we only mark the request as a mismatch if the difference between the two returned key
// selectors could ONLY be because of different results from the storage engines. We can afford to only partially
// check key selectors that start in a TSS shard and end in a non-TSS shard because the other read queries and the
// consistency check will eventually catch a misbehaving storage engine.
bool matches = true;
if (src.sel.orEqual == tss.sel.orEqual && src.sel.offset == tss.sel.offset) {
// full matching case
if (src.sel.offset == 0 && src.sel.orEqual) {
// found exact key, should be identical
matches = src.sel.getKey() == tss.sel.getKey();
}
// if the query doesn't return the final key, there is an edge case where the ss and tss have different shard
// boundaries, so they pass different shard boundary keys back for the same offset
} else if (src.sel.getKey() == tss.sel.getKey()) {
// There is one case with a positive offset where the shard boundary the incomplete query stopped at is the next
// key in the shard that the complete query returned. This is not possible with a negative offset because the
// shard boundary is exclusive backwards
if (src.sel.offset == 0 && src.sel.orEqual && tss.sel.offset == 1 && !tss.sel.orEqual) {
// case where ss was complete and tss was incomplete
} else if (tss.sel.offset == 0 && tss.sel.orEqual && src.sel.offset == 1 && !src.sel.orEqual) {
// case where tss was complete and ss was incomplete
} else {
matches = false;
}
} else {
// ss/tss returned different keys, and different offsets and/or orEqual
// here we just validate that ordering of the keys matches the ordering of the offsets
bool tssKeyLarger = src.sel.getKey() < tss.sel.getKey();
// the only case offsets are equal and orEqual aren't equal is the case with a negative offset,
// where one response has <=0 with the actual result and the other has <0 with the shard upper boundary.
// So whichever one has the actual result should have the lower key.
bool tssOffsetLarger = (src.sel.offset == tss.sel.offset) ? tss.sel.orEqual : src.sel.offset < tss.sel.offset;
matches = tssKeyLarger != tssOffsetLarger;
}
return matches;
}
template <>
const char* TSS_mismatchTraceName(const GetKeyRequest& req) {
return "TSSMismatchGetKey";
}
template <>
void TSS_traceMismatch(TraceEvent& event, const GetKeyRequest& req, const GetKeyReply& src, const GetKeyReply& tss) {
event
.detail("KeySelector",
format("%s%s:%d", req.sel.orEqual ? "=" : "", req.sel.getKey().printable().c_str(), req.sel.offset))
.detail("Tenant", req.tenantInfo.name)
.detail("Version", req.version)
.detail("SSReply",
format("%s%s:%d", src.sel.orEqual ? "=" : "", src.sel.getKey().printable().c_str(), src.sel.offset))
.detail("TSSReply",
format("%s%s:%d", tss.sel.orEqual ? "=" : "", tss.sel.getKey().printable().c_str(), tss.sel.offset));
}
// range reads
template <>
bool TSS_doCompare(const GetKeyValuesReply& src, const GetKeyValuesReply& tss) {
return src.more == tss.more && src.data == tss.data;
}
template <>
const char* TSS_mismatchTraceName(const GetKeyValuesRequest& req) {
return "TSSMismatchGetKeyValues";
}
static void traceKeyValuesSummary(TraceEvent& event,
const KeySelectorRef& begin,
const KeySelectorRef& end,
Optional<TenantName> tenant,
Version version,
int limit,
int limitBytes,
size_t ssSize,
bool ssMore,
size_t tssSize,
bool tssMore) {
std::string ssSummaryString = format("(%d)%s", ssSize, ssMore ? "+" : "");
std::string tssSummaryString = format("(%d)%s", tssSize, tssMore ? "+" : "");
event.detail("Begin", format("%s%s:%d", begin.orEqual ? "=" : "", begin.getKey().printable().c_str(), begin.offset))
.detail("End", format("%s%s:%d", end.orEqual ? "=" : "", end.getKey().printable().c_str(), end.offset))
.detail("Tenant", tenant)
.detail("Version", version)
.detail("Limit", limit)
.detail("LimitBytes", limitBytes)
.detail("SSReplySummary", ssSummaryString)
.detail("TSSReplySummary", tssSummaryString);
}
static void traceKeyValuesDiff(TraceEvent& event,
const KeySelectorRef& begin,
const KeySelectorRef& end,
Optional<TenantName> tenant,
Version version,
int limit,
int limitBytes,
const VectorRef<KeyValueRef>& ssKV,
bool ssMore,
const VectorRef<KeyValueRef>& tssKV,
bool tssMore) {
traceKeyValuesSummary(
event, begin, end, tenant, version, limit, limitBytes, ssKV.size(), ssMore, tssKV.size(), tssMore);
bool mismatchFound = false;
for (int i = 0; i < std::max(ssKV.size(), tssKV.size()); i++) {
if (i >= ssKV.size() || i >= tssKV.size() || ssKV[i] != tssKV[i]) {
event.detail("MismatchIndex", i);
if (i >= ssKV.size() || i >= tssKV.size() || ssKV[i].key != tssKV[i].key) {
event.detail("MismatchSSKey", i < ssKV.size() ? ssKV[i].key.printable() : "missing");
event.detail("MismatchTSSKey", i < tssKV.size() ? tssKV[i].key.printable() : "missing");
} else {
event.detail("MismatchKey", ssKV[i].key.printable());
event.detail("MismatchSSValue", traceChecksumValue(ssKV[i].value));
event.detail("MismatchTSSValue", traceChecksumValue(tssKV[i].value));
}
mismatchFound = true;
break;
}
}
ASSERT(mismatchFound);
}
template <>
void TSS_traceMismatch(TraceEvent& event,
const GetKeyValuesRequest& req,
const GetKeyValuesReply& src,
const GetKeyValuesReply& tss) {
traceKeyValuesDiff(event,
req.begin,
req.end,
req.tenantInfo.name,
req.version,
req.limit,
req.limitBytes,
src.data,
src.more,
tss.data,
tss.more);
}
// range reads and flat map
template <>
bool TSS_doCompare(const GetMappedKeyValuesReply& src, const GetMappedKeyValuesReply& tss) {
return src.more == tss.more && src.data == tss.data;
}
template <>
const char* TSS_mismatchTraceName(const GetMappedKeyValuesRequest& req) {
return "TSSMismatchGetMappedKeyValues";
}
template <>
void TSS_traceMismatch(TraceEvent& event,
const GetMappedKeyValuesRequest& req,
const GetMappedKeyValuesReply& src,
const GetMappedKeyValuesReply& tss) {
traceKeyValuesSummary(event,
req.begin,
req.end,
req.tenantInfo.name,
req.version,
req.limit,
req.limitBytes,
src.data.size(),
src.more,
tss.data.size(),
tss.more);
// FIXME: trace details for TSS mismatch of mapped data
}
// streaming range reads
template <>
bool TSS_doCompare(const GetKeyValuesStreamReply& src, const GetKeyValuesStreamReply& tss) {
return src.more == tss.more && src.data == tss.data;
}
template <>
const char* TSS_mismatchTraceName(const GetKeyValuesStreamRequest& req) {
return "TSSMismatchGetKeyValuesStream";
}
// TODO this is all duplicated from above, simplify?
template <>
void TSS_traceMismatch(TraceEvent& event,
const GetKeyValuesStreamRequest& req,
const GetKeyValuesStreamReply& src,
const GetKeyValuesStreamReply& tss) {
traceKeyValuesDiff(event,
req.begin,
req.end,
req.tenantInfo.name,
req.version,
req.limit,
req.limitBytes,
src.data,
src.more,
tss.data,
tss.more);
}
template <>
bool TSS_doCompare(const WatchValueReply& src, const WatchValueReply& tss) {
// We duplicate watches just for load, no need to validate replies.
return true;
}
template <>
const char* TSS_mismatchTraceName(const WatchValueRequest& req) {
ASSERT(false);
return "";
}
template <>
void TSS_traceMismatch(TraceEvent& event,
const WatchValueRequest& req,
const WatchValueReply& src,
const WatchValueReply& tss) {
ASSERT(false);
}
template <>
bool TSS_doCompare(const SplitMetricsReply& src, const SplitMetricsReply& tss) {
// We duplicate split metrics just for load, no need to validate replies.
return true;
}
template <>
const char* TSS_mismatchTraceName(const SplitMetricsRequest& req) {
ASSERT(false);
return "";
}
template <>
void TSS_traceMismatch(TraceEvent& event,
const SplitMetricsRequest& req,
const SplitMetricsReply& src,
const SplitMetricsReply& tss) {
ASSERT(false);
}
template <>
bool TSS_doCompare(const ReadHotSubRangeReply& src, const ReadHotSubRangeReply& tss) {
// We duplicate read hot sub range metrics just for load, no need to validate replies.
return true;
}
template <>
const char* TSS_mismatchTraceName(const ReadHotSubRangeRequest& req) {
ASSERT(false);
return "";
}
template <>
void TSS_traceMismatch(TraceEvent& event,
const ReadHotSubRangeRequest& req,
const ReadHotSubRangeReply& src,
const ReadHotSubRangeReply& tss) {
ASSERT(false);
}
template <>
bool TSS_doCompare(const SplitRangeReply& src, const SplitRangeReply& tss) {
// We duplicate read hot sub range metrics just for load, no need to validate replies.
return true;
}
template <>
const char* TSS_mismatchTraceName(const SplitRangeRequest& req) {
ASSERT(false);
return "";
}
template <>
void TSS_traceMismatch(TraceEvent& event,
const SplitRangeRequest& req,
const SplitRangeReply& src,
const SplitRangeReply& tss) {
ASSERT(false);
}
// change feed
template <>
bool TSS_doCompare(const OverlappingChangeFeedsReply& src, const OverlappingChangeFeedsReply& tss) {
ASSERT(false);
return true;
}
template <>
const char* TSS_mismatchTraceName(const OverlappingChangeFeedsRequest& req) {
ASSERT(false);
return "";
}
template <>
void TSS_traceMismatch(TraceEvent& event,
const OverlappingChangeFeedsRequest& req,
const OverlappingChangeFeedsReply& src,
const OverlappingChangeFeedsReply& tss) {
ASSERT(false);
}
// template specializations for metrics replies that should never be called because these requests aren't duplicated
// storage metrics
template <>
bool TSS_doCompare(const StorageMetrics& src, const StorageMetrics& tss) {
ASSERT(false);
return true;
}
template <>
const char* TSS_mismatchTraceName(const WaitMetricsRequest& req) {
ASSERT(false);
return "";
}
template <>
void TSS_traceMismatch(TraceEvent& event,
const WaitMetricsRequest& req,
const StorageMetrics& src,
const StorageMetrics& tss) {
ASSERT(false);
}
template <>
bool TSS_doCompare(const BlobGranuleFileReply& src, const BlobGranuleFileReply& tss) {
ASSERT(false);
return true;
}
template <>
const char* TSS_mismatchTraceName(const BlobGranuleFileRequest& req) {
ASSERT(false);
return "";
}
template <>
void TSS_traceMismatch(TraceEvent& event,
const BlobGranuleFileRequest& req,
const BlobGranuleFileReply& src,
const BlobGranuleFileReply& tss) {
ASSERT(false);
}
// only record metrics for data reads
template <>
void TSSMetrics::recordLatency(const GetValueRequest& req, double ssLatency, double tssLatency) {
SSgetValueLatency.addSample(ssLatency);
TSSgetValueLatency.addSample(tssLatency);
}
template <>
void TSSMetrics::recordLatency(const GetKeyRequest& req, double ssLatency, double tssLatency) {
SSgetKeyLatency.addSample(ssLatency);
TSSgetKeyLatency.addSample(tssLatency);
}
template <>
void TSSMetrics::recordLatency(const GetKeyValuesRequest& req, double ssLatency, double tssLatency) {
SSgetKeyValuesLatency.addSample(ssLatency);
TSSgetKeyValuesLatency.addSample(tssLatency);
}
template <>
void TSSMetrics::recordLatency(const GetMappedKeyValuesRequest& req, double ssLatency, double tssLatency) {
SSgetMappedKeyValuesLatency.addSample(ssLatency);
TSSgetMappedKeyValuesLatency.addSample(tssLatency);
}
template <>
void TSSMetrics::recordLatency(const WatchValueRequest& req, double ssLatency, double tssLatency) {}
template <>
void TSSMetrics::recordLatency(const WaitMetricsRequest& req, double ssLatency, double tssLatency) {}
template <>
void TSSMetrics::recordLatency(const SplitMetricsRequest& req, double ssLatency, double tssLatency) {}
template <>
void TSSMetrics::recordLatency(const ReadHotSubRangeRequest& req, double ssLatency, double tssLatency) {}
template <>
void TSSMetrics::recordLatency(const SplitRangeRequest& req, double ssLatency, double tssLatency) {}
template <>
void TSSMetrics::recordLatency(const GetKeyValuesStreamRequest& req, double ssLatency, double tssLatency) {}
template <>
void TSSMetrics::recordLatency(const OverlappingChangeFeedsRequest& req, double ssLatency, double tssLatency) {}
// this isn't even to storage servers
template <>
void TSSMetrics::recordLatency(const BlobGranuleFileRequest& req, double ssLatency, double tssLatency) {}
// -------------------
TEST_CASE("/StorageServerInterface/TSSCompare/TestComparison") {
printf("testing tss comparisons\n");
// to avoid compiler issues that StringRef(char* is deprecated)
std::string s_a = "a";
std::string s_b = "b";
std::string s_c = "c";
std::string s_d = "d";
std::string s_e = "e";
UID tssId;
GetValueReply gvReplyMissing;
GetValueReply gvReplyA(Optional<Value>(StringRef(s_a)), false);
GetValueReply gvReplyB(Optional<Value>(StringRef(s_b)), false);
ASSERT(TSS_doCompare(gvReplyMissing, gvReplyMissing));
ASSERT(TSS_doCompare(gvReplyA, gvReplyA));
ASSERT(TSS_doCompare(gvReplyB, gvReplyB));
ASSERT(!TSS_doCompare(gvReplyMissing, gvReplyA));
ASSERT(!TSS_doCompare(gvReplyA, gvReplyB));
// test GetKeyValues
Arena a;
GetKeyValuesReply gkvReplyEmpty;
GetKeyValuesReply gkvReplyOne;
KeyValueRef v;
v.key = StringRef(a, s_a);
v.value = StringRef(a, s_b);
gkvReplyOne.data.push_back_deep(gkvReplyOne.arena, v);
GetKeyValuesReply gkvReplyOneMore;
gkvReplyOneMore.data.push_back_deep(gkvReplyOneMore.arena, v);
gkvReplyOneMore.more = true;
ASSERT(TSS_doCompare(gkvReplyEmpty, gkvReplyEmpty));
ASSERT(TSS_doCompare(gkvReplyOne, gkvReplyOne));
ASSERT(TSS_doCompare(gkvReplyOneMore, gkvReplyOneMore));
ASSERT(!TSS_doCompare(gkvReplyEmpty, gkvReplyOne));
ASSERT(!TSS_doCompare(gkvReplyOne, gkvReplyOneMore));
GetKeyReply gkReplyA(KeySelectorRef(StringRef(a, s_a), false, 20), false);
GetKeyReply gkReplyB(KeySelectorRef(StringRef(a, s_b), false, 10), false);
GetKeyReply gkReplyC(KeySelectorRef(StringRef(a, s_c), true, 0), false);
GetKeyReply gkReplyD(KeySelectorRef(StringRef(a, s_d), false, -10), false);
GetKeyReply gkReplyE(KeySelectorRef(StringRef(a, s_e), false, -20), false);
// identical cases
ASSERT(TSS_doCompare(gkReplyA, gkReplyA));
ASSERT(TSS_doCompare(gkReplyB, gkReplyB));
ASSERT(TSS_doCompare(gkReplyC, gkReplyC));
ASSERT(TSS_doCompare(gkReplyD, gkReplyD));
ASSERT(TSS_doCompare(gkReplyE, gkReplyE));
// relative offset cases
ASSERT(TSS_doCompare(gkReplyA, gkReplyB));
ASSERT(TSS_doCompare(gkReplyB, gkReplyA));
ASSERT(TSS_doCompare(gkReplyA, gkReplyC));
ASSERT(TSS_doCompare(gkReplyC, gkReplyA));
ASSERT(TSS_doCompare(gkReplyB, gkReplyC));
ASSERT(TSS_doCompare(gkReplyC, gkReplyB));
ASSERT(TSS_doCompare(gkReplyC, gkReplyD));
ASSERT(TSS_doCompare(gkReplyD, gkReplyC));
ASSERT(TSS_doCompare(gkReplyC, gkReplyE));
ASSERT(TSS_doCompare(gkReplyE, gkReplyC));
ASSERT(TSS_doCompare(gkReplyD, gkReplyE));
ASSERT(TSS_doCompare(gkReplyE, gkReplyD));
// test same offset/orEqual wrong key
ASSERT(!TSS_doCompare(GetKeyReply(KeySelectorRef(StringRef(a, s_a), true, 0), false),
GetKeyReply(KeySelectorRef(StringRef(a, s_b), true, 0), false)));
// this could be from different shard boundaries, so don't say it's a mismatch
ASSERT(TSS_doCompare(GetKeyReply(KeySelectorRef(StringRef(a, s_a), false, 10), false),
GetKeyReply(KeySelectorRef(StringRef(a, s_b), false, 10), false)));
// test offsets and key difference don't match
ASSERT(!TSS_doCompare(GetKeyReply(KeySelectorRef(StringRef(a, s_a), false, 0), false),
GetKeyReply(KeySelectorRef(StringRef(a, s_b), false, 10), false)));
ASSERT(!TSS_doCompare(GetKeyReply(KeySelectorRef(StringRef(a, s_a), false, -10), false),
GetKeyReply(KeySelectorRef(StringRef(a, s_b), false, 0), false)));
// test key is next over in one shard, one found it and other didn't
// positive
// one that didn't find is +1
ASSERT(TSS_doCompare(GetKeyReply(KeySelectorRef(StringRef(a, s_a), false, 1), false),
GetKeyReply(KeySelectorRef(StringRef(a, s_b), true, 0), false)));
ASSERT(!TSS_doCompare(GetKeyReply(KeySelectorRef(StringRef(a, s_a), true, 0), false),
GetKeyReply(KeySelectorRef(StringRef(a, s_b), false, 1), false)));
// negative will have zero offset but not equal set
ASSERT(TSS_doCompare(GetKeyReply(KeySelectorRef(StringRef(a, s_a), true, 0), false),
GetKeyReply(KeySelectorRef(StringRef(a, s_b), false, 0), false)));
ASSERT(!TSS_doCompare(GetKeyReply(KeySelectorRef(StringRef(a, s_a), false, 0), false),
GetKeyReply(KeySelectorRef(StringRef(a, s_b), true, 0), false)));
// test shard boundary key returned by incomplete query is the same as the key found by the other (only possible in
// positive direction)
ASSERT(TSS_doCompare(GetKeyReply(KeySelectorRef(StringRef(a, s_a), true, 0), false),
GetKeyReply(KeySelectorRef(StringRef(a, s_a), false, 1), false)));
// explictly test checksum function
std::string s12 = "ABCDEFGHIJKL";
std::string s13 = "ABCDEFGHIJKLO";
std::string checksumStart13 = "(13)";
ASSERT(s_a == traceChecksumValue(StringRef(s_a)));
ASSERT(s12 == traceChecksumValue(StringRef(s12)));
ASSERT(checksumStart13 == traceChecksumValue(StringRef(s13)).substr(0, 4));
return Void();
}
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