bharatviswa504 commented on a change in pull request #1411: URL: https://github.com/apache/hadoop-ozone/pull/1411#discussion_r485784568
########## File path: hadoop-hdds/docs/content/design/s3_hcfs.md ########## @@ -67,45 +66,100 @@ To solve the performance problems of the directory listing / rename, [HDDS-2939] [HDDS-4097](https://issues.apache.org/jira/browse/HDDS-4097) is created to normalize the key names based on file-system semantics if `ozone.om.enable.filesystem.paths` is enabled. But please note that `ozone.om.enable.filesystem.paths` should always be turned on if S3 and HCFS are both used which means that S3 and HCFS couldn't be used together with normalization. -## Goals +# Goals + + * Out of the box Ozone should support both S3 and HCFS interfaces without any settings. (It's possible only for the regular, fs compatible key names) + * As 100% compatibility couldn't be achieved on both side we need a configuration to set the expectations for incompatible key names + * Default behavior of `o3fs` and `ofs` should be as close to `s3a` as possible (when s3 compatibilty is prefered) + +# Possible cases to support + +There are two main aspects of supporting both `ofs/o3fs` and `s3` together: + + 1. `ofs/o3fs` require to create intermediate directory entries (for exapmle `/a/b` for the key `/b/c/c`) + 2. Special file-system incompatible key names require special attention + +The second couldn't be done with compromise. + + 1. We either support all key names (including non fs compatible key names), which means `ofs/o3fs` can provide only a partial view + 2. Or we can normalize the key names to be fs compatible (which makes it possible to create inconsistent S3 keys) + +HDDS-3955 introduced `ozone.om.enable.filesystem.paths`, with this setting we will have two possible usage pattern: + +| ozone.om.enable.filesystem.paths= | true | false +|-|-|-| +| create itermediate dirs | YES | NO | +| normalize key names from `ofs/o3fs` | YES | NO +| force to normalize key names of `s3` interface | YES (1) | NO +| `s3` key `/a/b/c` available from `ofs/o3fs` | YES | NO +| `s3` key `/a/b//c` available from `ofs/o3fs` | YES | NO +| `s3` key `/a/b//c` available from `s3` | AWS S3 incompatibility | YES + +(1): Under implementation Review comment: Here AWS S3 incompatibility means, is it because we are showing normalized keys? ---------------------------------------------------------------- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. For queries about this service, please contact Infrastructure at: us...@infra.apache.org --------------------------------------------------------------------- To unsubscribe, e-mail: ozone-issues-unsubscr...@hadoop.apache.org For additional commands, e-mail: ozone-issues-h...@hadoop.apache.org
