* feat(mount): pre-allocate file IDs in pool for writeback cache mode
When writeback caching is enabled, chunk uploads no longer block on a
per-chunk AssignVolume RPC. Instead, a FileIdPool pre-allocates file IDs
in batches using a single AssignVolume(Count=N, ExpectedDataSize=ChunkSize)
call and hands them out instantly to upload workers.
Pool size is 2x ConcurrentWriters, refilled in background when it drops
below ConcurrentWriters. Entries expire after 25s to respect JWT TTL.
Sequential needle keys are generated from the base file ID returned by
the master, so one Assign RPC produces N usable IDs.
This cuts per-chunk upload latency from 2 RTTs (assign + upload) to
1 RTT (upload only), with the assign cost amortized across the batch.
* test: add benchmarks for file ID pool vs direct assign
Benchmarks measure:
- Pool Get vs Direct AssignVolume at various simulated latencies
- Batch assign scaling (Count=1 through Count=32)
- Concurrent pool access with 1-64 workers
Results on Apple M4:
- Pool Get: constant ~3ns regardless of assign latency
- Batch=16: 15.7x more IDs/sec than individual assigns
- 64 concurrent workers: 19M IDs/sec throughput
* fix(mount): address review feedback on file ID pool
1. Fix race condition in Get(): use sync.Cond so callers wait for an
in-flight refill instead of returning an error when the pool is empty.
2. Match default pool size to async flush worker count (128, not 16)
when ConcurrentWriters is unset.
3. Add logging to UploadWithAssignFunc for consistency with UploadWithRetry.
4. Document that pooled assigns omit the Path field, bypassing path-based
storage rules (filer.conf). This is an intentional tradeoff for
writeback cache performance.
5. Fix flaky expiry test: widen time margin from 50ms to 1s.
6. Add TestFileIdPoolGetWaitsForRefill to verify concurrent waiters.
* fix(mount): use individual Count=1 assigns to get per-fid JWTs
The master generates one JWT per AssignResponse, bound to the base file
ID (master_grpc_server_assign.go:158). The volume server validates that
the JWT's Fid matches the upload exactly (volume_server_handlers.go:367).
Using Count=N and deriving sequential IDs would fail this check.
Switch to individual Count=1 RPCs over a single gRPC connection. This
still amortizes connection overhead while getting a correct per-fid JWT
for each entry. Partial batches are accepted if some requests fail.
Remove unused needle import now that sequential ID generation is gone.
* fix(mount): separate pprof from FUSE protocol debug logging
The -debug flag was enabling both the pprof HTTP server and the noisy
go-fuse protocol logging (rx/tx lines for every FUSE operation). This
makes profiling impractical as the log output dominates.
Split into two flags:
- -debug: enables pprof HTTP server only (for profiling)
- -debug.fuse: enables raw FUSE protocol request/response logging
* perf(mount): replace LevelDB read+write with in-memory overlay for dir mtime
Profile showed TouchDirMtimeCtime at 0.22s — every create/rename/unlink
in a directory did a LevelDB FindEntry (read) + UpdateEntry (write) just
to bump the parent dir's mtime/ctime.
Replace with an in-memory map (same pattern as existing atime overlay):
- touchDirMtimeCtimeLocal now stores inode→timestamp in dirMtimeMap
- applyInMemoryDirMtime overlays onto GetAttr/Lookup output
- No LevelDB I/O on the mutation hot path
The overlay only advances timestamps forward (max of stored vs overlay),
so stale entries are harmless. Map is bounded at 8192 entries.
* perf(mount): skip self-originated metadata subscription events in writeback mode
With writeback caching, this mount is the single writer. All local
mutations are already applied to the local meta cache (via
applyLocalMetadataEvent or direct InsertEntry). The filer subscription
then delivers the same event back, causing redundant work:
proto.Clone, enqueue to apply loop, dedup ring check, and sometimes
redundant LevelDB writes when the dedup ring misses (deferred creates).
Check EventNotification.Signatures against selfSignature and skip
events that originated from this mount. This eliminates the redundant
processing for every self-originated mutation.
* perf(mount): increase kernel FUSE cache TTL in writeback cache mode
With writeback caching, this mount is the single writer — the local
meta cache is authoritative. Increase EntryValid and AttrValid from 1s
to 10s so the kernel doesn't re-issue Lookup/GetAttr for every path
component and stat call.
This reduces FUSE /dev/fuse round-trips which dominate the profile at
38% of CPU (syscall.rawsyscalln). Each saved round-trip eliminates a
kernel→userspace→kernel transition.
Normal (non-writeback) mode retains the 1s TTL for multi-mount
consistency.
* Added global http client
* Added Do func for global http client
* Changed the code to use the global http client
* Fix http client in volume uploader
* Fixed pkg name
* Fixed http util funcs
* Fixed http client for bench_filer_upload
* Fixed http client for stress_filer_upload
* Fixed http client for filer_server_handlers_proxy
* Fixed http client for command_fs_merge_volumes
* Fixed http client for command_fs_merge_volumes and command_volume_fsck
* Fixed http client for s3api_server
* Added init global client for main funcs
* Rename global_client to client
* Changed:
- fixed NewHttpClient;
- added CheckIsHttpsClientEnabled func
- updated security.toml in scaffold
* Reduce the visibility of some functions in the util/http/client pkg
* Added the loadSecurityConfig function
* Use util.LoadSecurityConfiguration() in NewHttpClient func
* compare chunks by timestamp
* fix slab clearing error
* fix test compilation
* move oldest chunk to sealed, instead of by fullness
* lock on fh.entryViewCache
* remove verbose logs
* revert slat clearing
* less logs
* less logs
* track write and read by timestamp
* remove useless logic
* add entry lock on file handle release
* use mem chunk only, swap file chunk has problems
* comment out code that maybe used later
* add debug mode to compare data read and write
* more efficient readResolvedChunks with linked list
* small optimization
* fix test compilation
* minor fix on writer
* add SeparateGarbageChunks
* group chunks into sections
* turn off debug mode
* fix tests
* fix tests
* tmp enable swap file chunk
* Revert "tmp enable swap file chunk"
This reverts commit 985137ec47.
* simple refactoring
* simple refactoring
* do not re-use swap file chunk. Sealed chunks should not be re-used.
* comment out debugging facilities
* either mem chunk or swap file chunk is fine now
* remove orderedMutex as *semaphore.Weighted
not found impactful
* optimize size calculation for changing large files
* optimize performance to avoid going through the long list of chunks
* still problems with swap file chunk
* rename
* tiny optimization
* swap file chunk save only successfully read data
* fix
* enable both mem and swap file chunk
* resolve chunks with range
* rename
* fix chunk interval list
* also change file handle chunk group when adding chunks
* pick in-active chunk with time-decayed counter
* fix compilation
* avoid nil with empty fh.entry
* refactoring
* rename
* rename
* refactor visible intervals to *list.List
* refactor chunkViews to *list.List
* add IntervalList for generic interval list
* change visible interval to use IntervalList in generics
* cahnge chunkViews to *IntervalList[*ChunkView]
* use NewFileChunkSection to create
* rename variables
* refactor
* fix renaming leftover
* renaming
* renaming
* add insert interval
* interval list adds lock
* incrementally add chunks to readers
Fixes:
1. set start and stop offset for the value object
2. clone the value object
3. use pointer instead of copy-by-value when passing to interval.Value
4. use insert interval since adding chunk could be out of order
* fix tests compilation
* fix tests compilation
Chris Lu