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@@ -90,7 +90,7 @@ There is only 40 bytes of disk storage overhead for each file's metadata. It is SeaweedFS started by implementing [Facebook's Haystack design paper](http://www.usenix.org/event/osdi10/tech/full_papers/Beaver.pdf). Also, SeaweedFS implements erasure coding with ideas from [f4: Facebookâs Warm BLOB Storage System](https://www.usenix.org/system/files/conference/osdi14/osdi14-paper-muralidhar.pdf) -On top of the object store, optional [Filer] can support directories and POSIX attributes. Filer is a separate linearly-scalable stateless server with customizable metadata stores, e.g., MySql, Postgres, Mongodb, Redis, Etcd, Cassandra, LevelDB, MemSql, TiDB, TiKV, CockroachDB, etc. +On top of the object store, optional [Filer] can support directories and POSIX attributes. Filer is a separate linearly-scalable stateless server with customizable metadata stores, e.g., MySql, Postgres, Mongodb, Redis, Cassandra, Elastic Search, LevelDB, MemSql, TiDB, Etcd, CockroachDB, etc. [Back to TOC](#table-of-contents) @@ -112,22 +112,23 @@ On top of the object store, optional [Filer] can support directories and POSIX a [Back to TOC](#table-of-contents) ## Filer Features ## -* [Filer server][Filer] provide "normal" directories and files via http. +* [Filer server][Filer] provides "normal" directories and files via http. * [Super Large Files][SuperLargeFiles] stores large or super large files in tens of TB. -* [Mount filer][Mount] to read and write files directly as a local directory via FUSE. -* [Amazon S3 compatible API][AmazonS3API] to access files with S3 tooling. -* [Hadoop Compatible File System][Hadoop] to access files from Hadoop/Spark/Flink/etc jobs. -* [Async Backup To Cloud][BackupToCloud] has extremely fast local access and backups to Amazon S3, Google Cloud Storage, Azure, BackBlaze. -* [WebDAV] access as a mapped drive on Mac and Windows, or from mobile devices. +* [Mount filer][Mount] reads and writes files directly as a local directory via FUSE. +* [Active-Active Replication][ActiveActiveAsyncReplication] enables asynchronous one-way or two-way cross cluster continuous replication. +* [Amazon S3 compatible API][AmazonS3API] accesses files with S3 tooling. +* [Hadoop Compatible File System][Hadoop] accesses files from Hadoop/Spark/Flink/etc or even runs HBase. +* [Async Replication To Cloud][BackupToCloud] has extremely fast local access and backups to Amazon S3, Google Cloud Storage, Azure, BackBlaze. +* [WebDAV] accesses as a mapped drive on Mac and Windows, or from mobile devices. * [AES256-GCM Encrypted Storage][FilerDataEncryption] safely stores the encrypted data. -* [File TTL][FilerTTL] automatically purge file metadata and actual file data. +* [File TTL][FilerTTL] automatically purges file metadata and actual file data. * [Kubernetes CSI Driver][SeaweedFsCsiDriver] A Container Storage Interface (CSI) Driver. [](https://hub.docker.com/r/chrislusf/seaweedfs-csi-driver/) [Filer]: https://github.com/chrislusf/seaweedfs/wiki/Directories-and-Files [SuperLargeFiles]: https://github.com/chrislusf/seaweedfs/wiki/Data-Structure-for-Large-Files [Mount]: https://github.com/chrislusf/seaweedfs/wiki/FUSE-Mount [AmazonS3API]: https://github.com/chrislusf/seaweedfs/wiki/Amazon-S3-API -[BackupToCloud]: https://github.com/chrislusf/seaweedfs/wiki/Backup-to-Cloud +[BackupToCloud]: https://github.com/chrislusf/seaweedfs/wiki/Async-Replication-to-Cloud [Hadoop]: https://github.com/chrislusf/seaweedfs/wiki/Hadoop-Compatible-File-System [WebDAV]: https://github.com/chrislusf/seaweedfs/wiki/WebDAV [ErasureCoding]: https://github.com/chrislusf/seaweedfs/wiki/Erasure-coding-for-warm-storage @@ -136,6 +137,7 @@ On top of the object store, optional [Filer] can support directories and POSIX a [FilerTTL]: https://github.com/chrislusf/seaweedfs/wiki/Filer-Stores [VolumeServerTTL]: https://github.com/chrislusf/seaweedfs/wiki/Store-file-with-a-Time-To-Live [SeaweedFsCsiDriver]: https://github.com/seaweedfs/seaweedfs-csi-driver +[ActiveActiveAsyncReplication]: https://github.com/chrislusf/seaweedfs/wiki/Filer-Active-Active-cross-cluster-continuous-synchronization [Back to TOC](#table-of-contents) @@ -365,10 +367,10 @@ The architectures are mostly the same. SeaweedFS aims to store and read files fa * SeaweedFS optimizes for small files, ensuring O(1) disk seek operation, and can also handle large files. * SeaweedFS statically assigns a volume id for a file. Locating file content becomes just a lookup of the volume id, which can be easily cached. -* SeaweedFS Filer metadata store can be any well-known and proven data stores, e.g., Cassandra, Mongodb, Redis, Etcd, MySql, Postgres, MemSql, TiDB, CockroachDB, etc, and is easy to customized. +* SeaweedFS Filer metadata store can be any well-known and proven data stores, e.g., Cassandra, Mongodb, Redis, Elastic Search, MySql, Postgres, MemSql, TiDB, CockroachDB, Etcd etc, and is easy to customized. * SeaweedFS Volume server also communicates directly with clients via HTTP, supporting range queries, direct uploads, etc. -| System | File Meta | File Content Read| POSIX | REST API | Optimized for small files | +| System | File Meta | File Content Read| POSIX | REST API | Optimized for large number of small files | | ------------- | ------------------------------- | ---------------- | ------ | -------- | ------------------------- | | SeaweedFS | lookup volume id, cacheable | O(1) disk seek | | Yes | Yes | | SeaweedFS Filer| Linearly Scalable, Customizable | O(1) disk seek | FUSE | Yes | Yes | @@ -406,7 +408,7 @@ Ceph uses CRUSH hashing to automatically manage the data placement. SeaweedFS pl SeaweedFS is optimized for small files. Small files are stored as one continuous block of content, with at most 8 unused bytes between files. Small file access is O(1) disk read. -SeaweedFS Filer uses off-the-shelf stores, such as MySql, Postgres, Mongodb, Redis, Etcd, Cassandra, MemSql, TiDB, CockroachCB, to manage file directories. These stores are proven, scalable, and easier to manage. +SeaweedFS Filer uses off-the-shelf stores, such as MySql, Postgres, Mongodb, Redis, Elastic Search, Cassandra, MemSql, TiDB, CockroachCB, Etcd, to manage file directories. These stores are proven, scalable, and easier to manage. | SeaweedFS | comparable to Ceph | advantage | | ------------- | ------------- | ---------------- | |