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From "Paul Joseph Davis (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (COUCHDB-1165) Allow CouchDB-managed OS daemons to include information in _active_tasks
Date Sat, 14 May 2011 16:00:47 GMT

    [ https://issues.apache.org/jira/browse/COUCHDB-1165?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13033571#comment-13033571
] 

Paul Joseph Davis commented on COUCHDB-1165:
--------------------------------------------

This won't make 1.1 as its already been branched. Though I wouldn't wait too long to take
a crack at it because I might get bored and write it. :D

> Allow CouchDB-managed OS daemons to include information in _active_tasks
> ------------------------------------------------------------------------
>
>                 Key: COUCHDB-1165
>                 URL: https://issues.apache.org/jira/browse/COUCHDB-1165
>             Project: CouchDB
>          Issue Type: New Feature
>          Components: Database Core, HTTP Interface
>            Reporter: Gabor Ratky
>            Priority: Minor
>
> The new Externals API coupled with the HTTP Proxying enables powerful background data
processing scenarios, similar to the replication and compaction API's in the core CouchDB
API. The Replication API returns a JSON structure that includes information about the replication
that has completed but progress information is also available through _active_tasks and thus,
Futon.
> An OS daemon that handles proxied requests to perform data processing tasks can also
reply with information about a completed request but has no way other than ["log", DMESG]
to communicate progress and append to the CouchDB log, similar how view checkpointing is included
in the CouchDB log.
> The suggested JSON commands supported by the Externals API would allow a daemon to register
a long-running tasks, report completion progress and status and signal when the long running
task completes.
> While I am not intimately familiar with the inner workings of _active_tasks and {couch_httpd_misc_handlers,
handle_task_status_req}, the following API would work (suggestions welcome!):
> Register a new active task:
> ["task", { "id":"import:foo.csv", "type": "File Import", "task":"foo.csv", "status":
"Imported 0 of 360,410 bytes (0%)" }]
> Report progress (same structure as registering a new active task):
> ["task", { "id":"import:foo.csv", "type": "File Import", "task":"foo.csv", "status":
"Imported 150,428 of 360,410 bytes (41%)" }]
> Register task completion:
> ["task", {"id":"import:foo.csv", complete: true}]
> Of course, id could be a number id that uniquely identifies the process itself. Currently,
active tasks include the "pid" of the process that performs the task. 
> It would be lovely to see this functionality in 1.2 and I will have time to work on this
in the 1.2 timeframe so if there are no objections and everyone agrees on a meaningful command
structure, I can work on the patch.

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