Add patching to keyvalue

ydb/core/base/blobstorage.h

@@ -1468,6 +1468,10 @@ struct TEvBlobStorage {
             }
         }
 
+        static ui8 BlobPlacementKind(const TLogoBlobID &blob) {
+            return blob.Hash() % BaseDomainsCount;
+        }
+
         static bool GetBlobIdWithSamePlacement(const TLogoBlobID &originalId, TLogoBlobID *patchedId,
                 ui32 bitsForBruteForce, ui32 originalGroupId, ui32 currentGroupId)
         {
@@ -2407,4 +2411,19 @@ inline bool SendPutToGroup(const TActorContext &ctx, ui32 groupId, TTabletStorag
     // TODO(alexvru): check if return status is actually needed?
 }
 
+inline bool SendPatchToGroup(const TActorContext &ctx, ui32 groupId, TTabletStorageInfo *storage,
+        THolder<TEvBlobStorage::TEvPatch> event, ui64 cookie = 0, NWilson::TTraceId traceId = {}) {
+    auto checkGroupId = [&] {
+        const TLogoBlobID &id = event->PatchedId;
+        const ui32 expectedGroupId = storage->GroupFor(id.Channel(), id.Generation());
+        const TLogoBlobID &originalId = event->OriginalId;
+        const ui32 expectedOriginalGroupId = storage->GroupFor(originalId.Channel(), originalId.Generation());
+        return id.TabletID() == storage->TabletID && expectedGroupId != Max<ui32>() && groupId == expectedGroupId && event->OriginalGroupId == expectedOriginalGroupId;
+    };
+    Y_VERIFY_S(checkGroupId(), "groupIds# (" << event->OriginalGroupId << ',' << groupId << ") does not match actual ones LogoBlobIds# (" <<
+        event->OriginalId.ToString() << ',' << event->PatchedId.ToString() << ')');
+    return SendToBSProxy(ctx, groupId, event.Release(), cookie, std::move(traceId));
+    // TODO(alexvru): check if return status is actually needed?
+}
+
 } // NKikimr

ydb/core/blobstorage/dsproxy/mock/dsproxy_mock.cpp

@@ -55,6 +55,11 @@ namespace NKikimr {
                     "not implemented")), 0, ev->Cookie);
             }
 
+            void Handle(TEvBlobStorage::TEvPatch::TPtr& ev) {
+                STLOG(PRI_DEBUG, BS_PROXY, BSPM10, "TEvPatch", (Msg, ev->Get()->ToString()));
+                Send(ev->Sender, CopyExecutionRelay(ev->Get(), Model->Handle(ev->Get())), 0, ev->Cookie);
+            }
+
             template<typename TOut, typename TIn>
             TOut *CopyExecutionRelay(TIn *in, TOut *out) {
                 out->ExecutionRelay = std::move(in->ExecutionRelay);
@@ -80,6 +85,7 @@ namespace NKikimr {
                     hFunc(TEvBlobStorage::TEvRange, Handle);
                     hFunc(TEvBlobStorage::TEvCollectGarbage, Handle);
                     hFunc(TEvBlobStorage::TEvStatus, Handle);
+                    hFunc(TEvBlobStorage::TEvPatch, Handle);
 
                     hFunc(TEvents::TEvPoisonPill, HandlePoison);
                     hFunc(TEvBlobStorage::TEvConfigureProxy, Handle);

ydb/core/blobstorage/dsproxy/mock/model.h

@@ -1,5 +1,6 @@
 #pragma once
 
+#include <cstring>
 #include <ydb/core/base/blobstorage.h>
 #include <ydb/core/blobstorage/pdisk/blobstorage_pdisk_util_space_color.h>
 
@@ -149,6 +150,64 @@ namespace NFake {
             return result.release();
         }
 
+        TEvBlobStorage::TEvPatchResult* Handle(TEvBlobStorage::TEvPatch *msg) {
+            // ensure we have full blob id, with PartId set to zero
+            const TLogoBlobID& id = msg->PatchedId;
+            Y_ABORT_UNLESS(id == id.FullID());
+
+            // validate put against set blocks
+            if (IsBlocked(id.TabletID(), id.Generation())) {
+                return new TEvBlobStorage::TEvPatchResult(NKikimrProto::BLOCKED, id, GetStorageStatusFlags(), GroupId, 0.f);
+            }
+
+            // check if this blob is not being collected -- writing such blob is a violation of BS contract
+            Y_ABORT_UNLESS(!IsCollectedByBarrier(id), "Id# %s", id.ToString().data());
+
+
+            const TLogoBlobID& originalId = msg->OriginalId;
+            auto it = Blobs.find(originalId);
+            if (it == Blobs.end()) {
+                // ensure this blob is not under GC
+                Y_ABORT_UNLESS(!IsCollectedByBarrier(id), "Id# %s", id.ToString().data());
+                return new TEvBlobStorage::TEvPatchResult(NKikimrProto::ERROR, id, GetStorageStatusFlags(), GroupId, 0.f);
+            }
+
+            auto& data = it->second;
+            // TODO(kruall): check bad diffs
+            TString buffer = TString::Uninitialized(data.Buffer.GetSize());
+            auto originalBuffer = data.Buffer.GetContiguousSpan();
+            memcpy(buffer.Detach(), originalBuffer.data(), buffer.size());
+            for (ui32 diffIdx = 0; diffIdx < msg->DiffCount; ++diffIdx) {
+                auto &diff = msg->Diffs[diffIdx];
+                auto diffBuffer = diff.Buffer.GetContiguousSpan();
+                memcpy(buffer.Detach() + diff.Offset, diffBuffer.data(), diffBuffer.size());
+            }
+
+
+            // validate that there are no blobs with the same gen/step, channel, cookie, but with different size
+            const TLogoBlobID base(id.TabletID(), id.Generation(), id.Step(), id.Channel(), 0, id.Cookie());
+            auto iter = Blobs.lower_bound(base);
+            if (iter != Blobs.end()) {
+                const TLogoBlobID& existing = iter->first;
+                Y_ABORT_UNLESS(
+                    id.TabletID() != existing.TabletID() ||
+                    id.Generation() != existing.Generation() ||
+                    id.Step() != existing.Step() ||
+                    id.Cookie() != existing.Cookie() ||
+                    id.Channel() != existing.Channel() ||
+                    id == existing,
+                    "id# %s existing# %s", id.ToString().data(), existing.ToString().data());
+                if (id == existing) {
+                    Y_ABORT_UNLESS(iter->second.Buffer == buffer);
+                }
+            }
+
+            // put an entry into logo blobs database and reply with success
+            Blobs.emplace(id, TRope(buffer));
+
+            return new TEvBlobStorage::TEvPatchResult(NKikimrProto::OK, id, GetStorageStatusFlags(), GroupId, 0.f);
+        }
+
         TEvBlobStorage::TEvBlockResult* Handle(TEvBlobStorage::TEvBlock *msg) {
             NKikimrProto::EReplyStatus status = NKikimrProto::OK;
 

ydb/core/keyvalue/keyvalue_intermediate.h

@@ -102,13 +102,30 @@ struct TIntermediate {
     struct TSetExecutorFastLogPolicy {
         bool IsAllowed;
     };
+    struct TPatch {
+        struct TDiff {
+            ui32 Offset;
+            TRope Buffer;
+        };
+
+        TString OriginalKey;
+        TLogoBlobID OriginalBlobId;
+        TString PatchedKey;
+        TLogoBlobID PatchedBlobId;
+
+        NKikimrProto::EReplyStatus Status;
+        TStorageStatusFlags StatusFlags;
+
+        TVector<TDiff> Diffs;
+    };
 
-    using TCmd = std::variant<TWrite, TDelete, TRename, TCopyRange, TConcat>;
+    using TCmd = std::variant<TWrite, TDelete, TRename, TCopyRange, TConcat, TPatch>;
     using TReadCmd = std::variant<TRead, TRangeRead>;
 
     TDeque<TRead> Reads;
     TDeque<TRangeRead> RangeReads;
     TDeque<TWrite> Writes;
+    TDeque<TPatch> Patches;
     TDeque<TDelete> Deletes;
     TDeque<TRename> Renames;
     TDeque<TCopyRange> CopyRanges;
@@ -120,6 +137,7 @@ struct TIntermediate {
 
     TStackVec<TCmd, 1> Commands;
     TStackVec<ui32, 1> WriteIndices;
+    TStackVec<ui32, 1> PatchIndices;
     std::optional<TReadCmd> ReadCommand;
 
     ui64 WriteCount = 0;