chore: 19316 Delete MerkleMap and FCHashMap (#22468)

Signed-off-by: Ivan Malygin <[email protected]>

Author: imalygin

.github/CODEOWNERS

@@ -71,7 +71,6 @@
 /platform-sdk/swirlds-common/                       @hiero-ledger/hiero-consensus-node-consensus-codeowners @hiero-ledger/hiero-consensus-node-foundation-codeowners
 /platform-sdk/swirlds-component-framework/          @hiero-ledger/hiero-consensus-node-consensus-codeowners
 /platform-sdk/swirlds-config-*/                     @hiero-ledger/hiero-consensus-node-foundation-codeowners
-/platform-sdk/swirlds-fchashmap/                    @hiero-ledger/hiero-consensus-node-foundation-codeowners
 /platform-sdk/swirlds-fcqueue/                      @hiero-ledger/hiero-consensus-node-foundation-codeowners
 /platform-sdk/swirlds-logging/                      @hiero-ledger/hiero-consensus-node-foundation-codeowners
 /platform-sdk/swirlds-logging-*/                    @hiero-ledger/hiero-consensus-node-foundation-codeowners

hedera-node/docs/design/app/states.md

@@ -9,8 +9,7 @@ state between nodes.
 The state of the system is, ultimately, stored in a Merkle tree using an API defined by the hashgraph platform. However,
 this implementation reality is not a detail that any of the service implementations need to be aware of! Instead, all
 state stored in the system can ultimately be broken down into simple singleton or key/value data structures. Indeed,
-the hashgraph platform makes this easy with an API for in-memory k/v storage (MerkleMap) and on-disk k/v storage
-(VirtualMap).
+the hashgraph platform makes this easy with an API for k/v storage (VirtualMap).
 
 The `com.hedera.node.app.spi.state` package contains APIs for a service module to interact with state. It was our
 objective to eliminate the need for a service module to interact directly with the merkle tree. This was done for four
@@ -87,9 +86,7 @@ or mutable and immutable states. It is simply given, by the application, the `Re
 
 There are two "state" interfaces for k/v maps: `ReadableKVState` and `WritableKVState`. `WritableKVState` extends from
 `ReadableKVState`, so a `WritableKVState` is read/write. The application module implements these interfaces on top of
-`MerkleMap`s or `VirtualMap`s, depending on whether the application's `Schema` declares the state to be in-memory
-or on-disk (more on this later). The service module only declares whether the state should be in-memory or on-disk,
-it does not ever get exposed to either the `MerkleMap` or `VirtualMap` directly.
+a `VirtualMap`. The service module does not ever get exposed to `VirtualMap` directly.
 
 Each state is scoped to a particular service implementation. They are never shared across service implementations.
 In fact, the state of a service **MUST NOT** be exposed as public API by any service API. The state of a service

hedera-node/hedera-app/src/test/resources/signedState/MHS/settingsUsed.txt

@@ -101,11 +101,6 @@ data/threadDump = threadDumpLogDir
              10 = reconnect.maxAckDelayMilliseconds
              10 = reconnect.maximumReconnectFailuresBeforeShutdown
           PT10M = reconnect.minimumTimeBetweenReconnects
-            200 = fcHashMap.maximumGCQueueSize
-           PT1M = fcHashMap.gcQueueThresholdPeriod
-           true = fcHashMap.archiveEnabled
-              7 = fcHashMap.rebuildSplitFactor
-             10 = fcHashMap.rebuildThreadCount
              -1 = virtualMap.numHashThreads
            50.0 = virtualMap.percentHashThreads
              -1 = virtualMap.numCleanerThreads

platform-sdk/docs/platformWiki.md

@@ -71,8 +71,6 @@ This code is maintained by the "Platform Data" team.
 - Data Structures
   - VirtualMap
     - MerkleDB
-  - MerkleMap
-  - FCHashMap
   - FCQueue
 - Reconnect
 

platform-sdk/swirlds-benchmarks/build.gradle.kts

@@ -18,7 +18,6 @@ jmhModuleInfo {
     requires("com.swirlds.config.api")
     requires("com.swirlds.metrics.api")
     requires("com.swirlds.config.extensions")
-    requires("com.swirlds.fchashmap")
     requires("com.swirlds.merkledb")
     requires("com.swirlds.virtualmap")
     requires("com.swirlds.platform.core")