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Updated Hadoop Compatible File System (markdown)

Chris Lu 2019-03-30 23:40:01 -07:00
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Hadoop-Compatible-File-System.md

@ -160,6 +160,20 @@ If HBase is used, create a folder and configure the HBase root directory in `etc
``` ```
# Notes # Notes
## Atomicity
SeaweedFS satisfies the HCFS [requirements](https://hadoop.apache.org/docs/r2.7.2/hadoop-project-dist/hadoop-common/filesystem/introduction.html) that the following operations to be atomic, when using MySql/Postgres database transactions.
1. Creating a file. If the overwrite parameter is false, the check and creation MUST be atomic.
1. Deleting a file.
1. Renaming a file.
1. Renaming a directory.
1. Creating a single directory with mkdir().
Among these, except file or directory renaming, the following operations are all atomic for any filer store.
1. Creating a file
1. Deleting a file
1. Creating a single directory with mkdir().
## No native shared libraries ## No native shared libraries
The SeaweedFS hadoop client is a pure java library. There are no native libraries to install if you already have Hadoop running. The SeaweedFS hadoop client is a pure java library. There are no native libraries to install if you already have Hadoop running.