perf(storage): converge Wave 2 hot-path optimizations (#6065)

* perf(get): share inline shards and lock clients

Co-Authored-By: heihutu <heihutu@gmail.com>

* perf(ecstore): converge PUT encoding on contiguous blocks

Co-Authored-By: heihutu <heihutu@gmail.com>

* perf(get): cache codec streaming gate config

Co-Authored-By: heihutu <heihutu@gmail.com>

* fix(sse): redact projected customer headers

Co-Authored-By: heihutu <heihutu@gmail.com>

* perf(ecstore): collapse GET metadata snapshots

Co-Authored-By: heihutu <heihutu@gmail.com>

* perf(ecstore): reuse decode stripe scratch

Co-Authored-By: heihutu <heihutu@gmail.com>

* refactor(ecstore): trim decode scratch adapters

Co-Authored-By: heihutu <heihutu@gmail.com>

* test(ecstore): adapt transition checks to metadata snapshots

Co-Authored-By: heihutu <heihutu@gmail.com>

* perf(get): release metadata snapshots at ownership boundary

Co-Authored-By: heihutu <heihutu@gmail.com>

* refactor(ecstore): close cumulative fast-path findings

Co-Authored-By: heihutu <heihutu@gmail.com>

* fix(storage): preserve lock and header invariants

Co-Authored-By: heihutu <heihutu@gmail.com>

* test(ecstore): adapt cumulative paths after rebase

Co-Authored-By: heihutu <heihutu@gmail.com>

* fix(rio-v2): adapt generated metadata fixture

Co-Authored-By: heihutu <heihutu@gmail.com>

---------

Co-authored-by: heihutu <heihutu@gmail.com>

crates/lock/src/distributed_lock.rs

@@ -477,7 +477,7 @@ impl Drop for DistributedLockGuard {
 #[derive(Debug)]
 pub struct DistributedLock {
     /// Lock clients for this namespace
-    clients: Vec<Arc<dyn LockClient>>,
+    clients: Arc<[Arc<dyn LockClient>]>,
     /// Namespace identifier
     namespace: Arc<str>,
     /// Quorum size for exclusive/write operations
@@ -496,11 +496,11 @@ struct LockAcquireQuorumResult {
 impl DistributedLock {
     /// Create new distributed lock
     pub fn new(namespace: String, clients: Vec<Arc<dyn LockClient>>, quorum: usize) -> Self {
-        Self::new_shared(namespace.into(), clients, quorum)
+        Self::new_shared(namespace.into(), clients.into(), quorum)
     }
 
-    /// Create a distributed lock that shares an existing namespace allocation.
-    pub(crate) fn new_shared(namespace: Arc<str>, clients: Vec<Arc<dyn LockClient>>, quorum: usize) -> Self {
+    /// Create a distributed lock that shares existing namespace and client allocations.
+    pub(crate) fn new_shared(namespace: Arc<str>, clients: Arc<[Arc<dyn LockClient>]>, quorum: usize) -> Self {
         let q = if clients.len() <= 1 {
             1
         } else {
@@ -777,7 +777,7 @@ impl DistributedLock {
 
     fn spawn_pending_cleanup(
         mut pending: JoinSet<LockAcquireTaskResult>,
-        clients: Vec<Arc<dyn LockClient>>,
+        clients: Arc<[Arc<dyn LockClient>]>,
         fallback_lock_id: LockId,
         context: &'static str,
     ) {

crates/lock/src/namespace/mod.rs

@@ -200,9 +200,13 @@ impl NamespaceLock {
         Self::Distributed(DistributedLock::new(namespace, clients, quorum))
     }
 
-    /// Create a namespace lock that shares an existing namespace allocation.
-    pub fn with_clients_and_quorum_shared(namespace: Arc<str>, clients: Vec<Arc<dyn LockClient>>, quorum: usize) -> Self {
-        Self::Distributed(DistributedLock::new_shared(namespace, clients, quorum))
+    /// Create a namespace lock that shares existing namespace and client allocations.
+    pub fn with_clients_and_quorum_shared(
+        namespace: Arc<str>,
+        clients: impl Into<Arc<[Arc<dyn LockClient>]>>,
+        quorum: usize,
+    ) -> Self {
+        Self::Distributed(DistributedLock::new_shared(namespace, clients.into(), quorum))
     }
 
     /// Get namespace identifier