validator: Avoid AccountsDbConfig::default() (#10806)

Using a default trait implementation can be convenient for cases like
tests where the config is inconsequential to the test. However, the
convenience makes it easy to miss things in production cases where the
consequences are greater.

Make the validator specify each field in AccountsDbConfig instead of
filling in the rest of the struct with ..AccountsDbConfig::default()

Author: steviez

validator/src/commands/run/execute.rs

@@ -24,6 +24,7 @@ use {
             AccountSecondaryIndexes, AccountsIndexConfig, DEFAULT_NUM_ENTRIES_OVERHEAD,
             DEFAULT_NUM_ENTRIES_TO_EVICT, IndexLimit, IndexLimitThreshold, ScanFilter,
         },
+        partitioned_rewards::PartitionedEpochRewardsConfig,
         utils::{
             create_all_accounts_run_and_snapshot_dirs, create_and_canonicalize_directories,
             create_and_canonicalize_directory,
@@ -683,6 +684,7 @@ pub fn execute(
         shrink_paths: account_shrink_run_paths,
         shrink_ratio,
         read_cache_limit_bytes,
+        read_cache_evict_sample_size: None,
         write_cache_limit_bytes: value_t!(matches, "accounts_db_cache_limit_mb", u64)
             .ok()
             .map(|mb| mb * MB as u64),
@@ -694,7 +696,9 @@ pub fn execute(
         )
         .ok(),
         max_ancient_storages: value_t!(matches, "accounts_db_max_ancient_storages", usize).ok(),
+        skip_initial_hash_calc: false,
         exhaustively_verify_refcounts: matches.is_present("accounts_db_verify_refcounts"),
+        partitioned_epoch_rewards_config: PartitionedEpochRewardsConfig::default(),
         storage_access,
         scan_filter_for_shrinking,
         num_background_threads: Some(accounts_db_background_threads),
@@ -703,7 +707,7 @@ pub fn execute(
         use_registered_io_uring_buffers: resource_limits::check_memlock_limit_for_disk_io(
             solana_accounts_db::accounts_db::TOTAL_IO_URING_BUFFERS_SIZE_LIMIT,
         ),
-        ..AccountsDbConfig::default()
+        snapshots_use_direct_io: false,
     };
 
     let on_start_geyser_plugin_config_files = if matches.is_present("geyser_plugin_config") {