{"action":"created","issue":{"url":"https://api.github.com/repos/ioos/ioosngdac/issues/58","labels_url":"https://api.github.com/repos/ioos/ioosngdac/issues/58/labels{/name}","comments_url":"https://api.github.com/repos/ioos/ioosngdac/issues/58/comments","events_url":"https://api.github.com/repos/ioos/ioosngdac/issues/58/events","html_url":"https://github.com/ioos/ioosngdac/issues/58","id":82076909,"number":58,"title":"How to tell if an aggregation was updated","user":{"login":"kwilcox","id":13939,"avatar_url":"https://avatars.githubusercontent.com/u/13939?v=3","gravatar_id":"","url":"https://api.github.com/users/kwilcox","html_url":"https://github.com/kwilcox","followers_url":"https://api.github.com/users/kwilcox/followers","following_url":"https://api.github.com/users/kwilcox/following{/other_user}","gists_url":"https://api.github.com/users/kwilcox/gists{/gist_id}","starred_url":"https://api.github.com/users/kwilcox/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/kwilcox/subscriptions","organizations_url":"https://api.github.com/users/kwilcox/orgs","repos_url":"https://api.github.com/users/kwilcox/repos","events_url":"https://api.github.com/users/kwilcox/events{/privacy}","received_events_url":"https://api.github.com/users/kwilcox/received_events","type":"User","site_admin":false},"labels":[],"state":"closed","locked":false,"assignee":null,"milestone":null,"comments":2,"created_at":"2015-05-28T18:44:53Z","updated_at":"2015-05-28T19:18:29Z","closed_at":"2015-05-28T19:18:29Z","body":"I've found it difficult to determine when data from a glider deployment has became available or been updated. The individual dive files are not available for download (that I could find) and scraping each deployment page looking for new or changed files seemed hacky and prone to break. I fell back to querying the DAP time variable for new timesteps. Not a terrible solution but it does not allow me to determine what else, if anything, has changed in the aggregation since the last time I checked (for example: an old dive file was manually corrected and re-uploaded).\r\n\r\nThis has been an issue with the DAP spec for as long as it has been around (no checksums). Since the glider-dac already does some magic before aggregating the dives and making them available through DAP, could a checksum be recomputed for each deployment every time it changes and added as a global attribute? Without this I'm forced to download every glider deployment in the DAC (fairly often) just to be sure that I'm not missing any new or corrected data. With a checksum, someone could very quickly determine if anything in the deployment has changed.\r\n\r\nIf there is a better way to do what I'm suggesting please let me know, thanks!\r\n"},"comment":{"url":"https://api.github.com/repos/ioos/ioosngdac/issues/comments/106570503","html_url":"https://github.com/ioos/ioosngdac/issues/58#issuecomment-106570503","issue_url":"https://api.github.com/repos/ioos/ioosngdac/issues/58","id":106570503,"user":{"login":"kwilcox","id":13939,"avatar_url":"https://avatars.githubusercontent.com/u/13939?v=3","gravatar_id":"","url":"https://api.github.com/users/kwilcox","html_url":"https://github.com/kwilcox","followers_url":"https://api.github.com/users/kwilcox/followers","following_url":"https://api.github.com/users/kwilcox/following{/other_user}","gists_url":"https://api.github.com/users/kwilcox/gists{/gist_id}","starred_url":"https://api.github.com/users/kwilcox/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/kwilcox/subscriptions","organizations_url":"https://api.github.com/users/kwilcox/orgs","repos_url":"https://api.github.com/users/kwilcox/repos","events_url":"https://api.github.com/users/kwilcox/events{/privacy}","received_events_url":"https://api.github.com/users/kwilcox/received_events","type":"User","site_admin":false},"created_at":"2015-05-28T19:18:29Z","updated_at":"2015-05-28T19:18:29Z","body":"@kerfoot this is perfect, thanks"}}