v1.4.0-beta2

This is the second beta release for JuiceFS v1.4. Since beta1 it has 60 commits from 13 contributors, thanks to @zxh326 @Xuyuchao-juice @jiefenghuang @Niennienzz @solracsf @CaitinChen @timfeirg @YunhuiChen @davies @chenjie4255 @polyrabbit @qingketsing @zhijian-pro

## New

- sync: checkpoint support multipart uploads (#7046,#7076,#7071)

## Changed

- meta: commit new chunks in write order (#7016)
- meta/tkv: do lookup in a single transaction (#7039)
- meta/tkv: optimize tikv changelog id (#7023)
- meta/tkv: change changelog and kerberos token prefix (#7029)
- meta/redis: optimize invalidation to avoid full entry-cache traversal (#7015,#7021)
- meta/sql: batch chunk_ref updates to reduce SQL round-trips (#7018)
- chunk: scale prefetcher pending buffer with worker count (#7059)
- cache: use concurrency only for initial cache scanning (#6994)
- fs: add permission check for BatchDeleteEntries (#7083)
- fuse: return immediately if readdir failed in ReadDirPlus (#7062)
- cmd: refactor parameters related to tier storage (#7074)
- cmd/mount: improve mount process kill and diagnostics (#6998, #7034)
- cmd/mount: check explicit cancel before duration (#7061)
- cmd/gateway: use lookup instead of stat when deleting in batches (#7078)
- cmd/gc: allow listed objects without size and mtime (#7063)

## Bug Fixes

- meta/tkv: fix panic in doLookup when attr is nil (#7047)
- meta: fix user/group quota for sustained nodes (#6991)
- meta/quota: restore the strict option for setting quota (#7011)
- meta: add mutex to doFlushQuotas to prevent concurrent execution (#7080)
- cache/stage: fix free stage blocks when disk full (#7056)
- cmd/sync: keep files-from symlink dirs as links (#7050)
- cmd/gateway: fix infinite loop in config handling (#7037)
- cmd/gateway: prevent panic on invalid uploadID (#7051)
- cmd/gateway: head file/ should always fail (#7064)
- sdk/windows: fix export jfs_set_callback and jfs_callback symbols in Windows DLL (#6976)
- sdk/windows: fixed ldap_msgfree & ldap_first_entry names (#7033)
- sdk/java: fix flags when reload (#7082)
- sdk/python: fix tests folder being packaged (#7067)
- sdk: fix accesslog dead loop (#7065)
- log: fix log in SelfCheck bandwidth warning (#7057)
- log: fix typo 'boudary' in WriteAt error message (#7058)

## Deps

- build: reduce size of lite version (#7017)
- deps: upgrade `storj/uplink` to v1.14.2 (#6996,#7081)