deployment: add support for the LRU cache (#4981)

## Motivation

This addition/backport of the LRU settings addition.
This is the original PR :
#4964

## Test Plan

Changes were tested on an ephemeral temporary network successfully.

## Release Plan

- These changes ARE the backport and will follow the usual release
cycle.

## Links

Original PR: #4964

- [reviewer
checklist](https://github.com/linera-io/linera-protocol/blob/main/CONTRIBUTING.md#reviewer-checklist)

Author: eldios

docker/docker-compose.indexer-test.yml

@@ -10,7 +10,8 @@ services:
     environment:
       - LINERA_STORAGE_SERVICE_PORT=${LINERA_STORAGE_SERVICE_PORT:-1235}
     healthcheck:
-      test: ["CMD-SHELL", "nc -z localhost ${LINERA_STORAGE_SERVICE_PORT:-1235}"]
+      test:
+        ["CMD-SHELL", "nc -z localhost ${LINERA_STORAGE_SERVICE_PORT:-1235}"]
       interval: 5s
       timeout: 3s
       retries: 10
@@ -25,7 +26,9 @@ services:
     ports:
       - "${INDEXER_PORT:-8081}:${INDEXER_PORT:-8081}"
     command: >
-      sh -c "set -ex; ./linera-indexer-grpc --port ${INDEXER_PORT:-8081} --database-path ${INDEXER_DATABASE_PATH:-/data/indexer.db}"
+      sh -c "set -ex; ./linera-indexer-grpc
+      --port ${INDEXER_PORT:-8081}
+      --database-path ${INDEXER_DATABASE_PATH:-/data/indexer.db}
     environment:
       - INDEXER_PORT=${INDEXER_PORT:-8081}
       - INDEXER_DATABASE_PATH=${INDEXER_DATABASE_PATH:-/data/indexer.db}
@@ -127,7 +130,11 @@ services:
       linera-indexer:
         condition: service_healthy
     healthcheck:
-      test: ["CMD-SHELL", "wget --no-verbose --tries=1 --spider http://localhost:${EXPLORER_API_PORT:-3002}/api/health || exit 1"]
+      test:
+        [
+          "CMD-SHELL",
+          "wget --no-verbose --tries=1 --spider http://localhost:${EXPLORER_API_PORT:-3002}/api/health || exit 1",
+        ]
       interval: 30s
       timeout: 10s
       retries: 3
@@ -145,4 +152,5 @@ volumes:
 
 networks:
   linera-network:
-    driver: bridge
+    driver: bridge
+

kubernetes/linera-validator/templates/proxy.yaml

@@ -99,6 +99,8 @@ spec:
               exec ./linera-proxy \
                 --storage scylladb:tcp:scylla-client.scylla.svc.cluster.local:9042 \
                 --storage-replication-factor {{ .Values.storageReplicationFactor | quote }} \
+                --storage-max-cache-size {{ .Values.storageCacheConfig.maxCacheSize | int }} \
+                --storage-max-cache-entries {{ .Values.storageCacheConfig.maxCacheEntries | int }} \
                 --id "$ORDINAL" \
                 /config/server.json
           env:

kubernetes/linera-validator/templates/shards.yaml

@@ -93,7 +93,9 @@ spec:
                 --storage {{ .Values.storage | quote }} \
                 --server /config/server.json \
                 --shard $ORDINAL \
-                --storage-replication-factor {{ .Values.storageReplicationFactor | quote }}
+                --storage-replication-factor {{ .Values.storageReplicationFactor | quote }} \
+                --storage-max-cache-size {{ .Values.storageCacheConfig.maxCacheSize | int }} \
+                --storage-max-cache-entries {{ .Values.storageCacheConfig.maxCacheEntries | int }} \
           env:
             - name: RUST_LOG
               value: {{ .Values.logLevel }}

kubernetes/linera-validator/values.yaml

@@ -40,6 +40,14 @@ storage: "scylladb:tcp:scylla-client.scylla.svc.cluster.local:9042"
 # Storage replication factor
 storageReplicationFactor: 1
 
+# LRU cache configuration for storage operations
+# These settings control memory usage for caching storage queries
+storageCacheConfig:
+  # Maximum total cache size in bytes (default: 10MB)
+  maxCacheSize: 10000000
+  # Maximum number of entries in the cache (default: 1000)
+  maxCacheEntries: 1000
+
 # Dual storage mode (RocksDB + ScyllaDB)
 dualStore: false