Idea for an efficient storage

[guimard]

Most of email users keep inactive mails into their mailboxes, then the company storage size grows always (and then the cost).

The idea here is to split S3 storage into 2 S3 services : hot storage and cold storage, the cold one is a low speed storage like Amazon glacier.

• a mail unread for more than "delay" is moved from hot storage into cold storage, only Cassandra data stays active
• when user wants to open a mail stored into cold storage, the James API may return a "Wait for X" to the client which will wait for X to call the API and get the mail. The X delay permits to move back the mail from cold to hot storage

[chibenwa]

Can be done transparently with S3 with lifecycle policies

(if your s3 supplier supports it!)

Example:

aws s3api put-bucket-lifecycle-configuration --bucket nom-du-bucket --lifecycle-configuration '{
  "Rules": [
    {
      "ID": "MoveToGlacierAfterOneYear",
      "Filter": {
        "Prefix": ""
      },
      "Status": "Enabled",
      "Transitions": [
        {
          "Days": 365,
          "StorageClass": "GLACIER"
        }
      ]
    }
  ]
}'