Optimize RocksDB WAL file (#6328)

Signed-off-by: Fabio Di Fabio <fabio.difabio@consensys.net>

CHANGELOG.md

@@ -13,6 +13,7 @@
 - Set Ethereum Classic mainnet activation block for Spiral network upgrade [#6267](https://github.com/hyperledger/besu/pull/6267)
 - Add custom genesis file name to config overview if specified [#6297](https://github.com/hyperledger/besu/pull/6297)
 - Update Gradle plugins and replace unmaintained License Gradle Plugin with the actively maintained Gradle License Report [#6275](https://github.com/hyperledger/besu/pull/6275)
+- Optimize RocksDB WAL files, allows for faster restart and a more linear disk space utilization [#6328](https://github.com/hyperledger/besu/pull/6328)
 
 ### Bug fixes
 

plugins/rocksdb/src/main/java/org/hyperledger/besu/plugin/services/storage/rocksdb/segmented/RocksDBColumnarKeyValueStorage.java

@@ -77,6 +77,11 @@ public abstract class RocksDBColumnarKeyValueStorage implements SegmentedKeyValu
   protected static final long ROCKSDB_BLOCKCACHE_SIZE_HIGH_SPEC = 1_073_741_824L;
   /** RocksDb memtable size when using the high spec option */
   protected static final long ROCKSDB_MEMTABLE_SIZE_HIGH_SPEC = 1_073_741_824L;
+  /** Max total size of all WAL file, after which a flush is triggered */
+  protected static final long WAL_MAX_TOTAL_SIZE = 1_073_741_824L;
+  /** Expected size of a single WAL file, to determine how many WAL files to keep around */
+  protected static final long EXPECTED_WAL_FILE_SIZE = 67_108_864L;
+
   /** RocksDb number of log files to keep on disk */
   private static final long NUMBER_OF_LOG_FILES_TO_KEEP = 7;
   /** RocksDb Time to roll a log file (1 day = 3600 * 24 seconds) */
@@ -237,6 +242,8 @@ public abstract class RocksDBColumnarKeyValueStorage implements SegmentedKeyValu
     options
         .setCreateIfMissing(true)
         .setMaxOpenFiles(configuration.getMaxOpenFiles())
+        .setMaxTotalWalSize(WAL_MAX_TOTAL_SIZE)
+        .setRecycleLogFileNum(WAL_MAX_TOTAL_SIZE / EXPECTED_WAL_FILE_SIZE)
         .setStatistics(stats)
         .setCreateMissingColumnFamilies(true)
         .setLogFileTimeToRoll(TIME_TO_ROLL_LOG_FILE)