[Dovecot] Fetch order
Hi all,
Is there a function to modify the fetch order of messages? We have just migrated from Courier to Dovecot and I notice that there is a slight difference in the way messages are fetched in Dovecot compared to Courier.
Both Courier and Dovecot sort the mailbox correctly (UID SORT (REVERSE ARRIVAL) UTF-8 ALL), for example:
[ 13:22:02.790 ]50800314 UID SORT (REVERSE ARRIVAL) UTF-8 ALL
- SORT 195 194 193 192 191 190 189 188 187 186 185 184 183 182 181 180 179 178 177 176 175 174 173 172 171 170 169 168 167 166 165 164 163 162 161 160 159 158 157 156 155 154 153 152 151 150 149 148 147 146 145 144 143 142 141 140 139 138 137 136 135 134 133 132 131 130 129 128 127 126 125 124 123 122 121 120 119 118 117 116 115 114 113 112 111 110 109 108 107 106 105 104 103 102 101 100 99 98 97 96 95 94 93 92 91 90 89 88 87 86 85 84 83 82 81 80 79 78 77 76 75 74 73 72 71 70 69 68 67 66 65 64 63 62 61 60 59 58 57 56 55 54 53 52 51 50 49 48 47 46 45 43 44 42 41 40 39 38 37 36 35 34 33 32 31 30 29 28 27 26 1 4 8 10 15 18 20 25 14 19 2 3 5 9 13 17 21 22 7 11 16 6 12 23 24 50800314 OK Sort completed.
But if we fetch the latest 25 messages, Dovecot will fetch the lowest UID in the list first, so from the example above it would fetch UID 171,172,173 and so on. Courier on the other hand would start the fetch on UID 195,194,193 and so on.
We have an internal developed webmail application that has been affected by this change, so I am just wondering whether there is a interim fix while we fix our webmail application to cater for this.
Thanks, Warren
On Fri, 2008-11-07 at 14:37 +0200, Warren Baker wrote:
But if we fetch the latest 25 messages, Dovecot will fetch the lowest UID in the list first, so from the example above it would fetch UID 171,172,173 and so on. Courier on the other hand would start the fetch on UID 195,194,193 and so on.
We have an internal developed webmail application that has been affected by this change, so I am just wondering whether there is a interim fix while we fix our webmail application to cater for this.
Not really. I'm sure you'll have your webmail code fixed before you could have changed Dovecot to return results in different order..
Or you could of course have your webmail code issue commands a bit differently. Rather than:
a FETCH 3,2,1 ..
Issue:
a FETCH 3 .. b FETCH 2 .. c FETCH 1 ..
The latter is less efficient of course.
2008/11/7 Timo Sirainen tss@iki.fi:
On Fri, 2008-11-07 at 14:37 +0200, Warren Baker wrote:
But if we fetch the latest 25 messages, Dovecot will fetch the lowest UID in the list first, so from the example above it would fetch UID 171,172,173 and so on. Courier on the other hand would start the fetch on UID 195,194,193 and so on.
We have an internal developed webmail application that has been affected by this change, so I am just wondering whether there is a interim fix while we fix our webmail application to cater for this.
Not really. I'm sure you'll have your webmail code fixed before you could have changed Dovecot to return results in different order..
Or you could of course have your webmail code issue commands a bit differently. Rather than:
a FETCH 3,2,1 ..
Issue:
a FETCH 3 .. b FETCH 2 .. c FETCH 1 ..
The latter is less efficient of course.
Yes of course - was just wondering whether there might be some hidden config option. You are absolutely correct though that webmail would be fixed quicker :)
Are there any guidelines for IMAP servers indicating what the fetch order should be?
In the mean time thanks for the suggestions Timo!
Warren
On Fri, 2008-11-07 at 15:05 +0200, Warren Baker wrote:
2008/11/7 Timo Sirainen tss@iki.fi:
On Fri, 2008-11-07 at 14:37 +0200, Warren Baker wrote:
But if we fetch the latest 25 messages, Dovecot will fetch the lowest UID in the list first, so from the example above it would fetch UID 171,172,173 and so on. Courier on the other hand would start the fetch on UID 195,194,193 and so on.
We have an internal developed webmail application that has been affected by this change, so I am just wondering whether there is a interim fix while we fix our webmail application to cater for this.
Not really. I'm sure you'll have your webmail code fixed before you could have changed Dovecot to return results in different order..
Yes of course - was just wondering whether there might be some hidden config option.
No. Dovecot is optimized to return fetch results in incremental order. It's not easy to change it.
You are absolutely correct though that webmail would be fixed quicker :)
Are there any guidelines for IMAP servers indicating what the fetch order should be?
Untagged results may be returned in any order the server wants, as long as all of them are returned before the tagged OK.
Actually with Dovecot v1.1+ if you send multiple FETCH commands at the same time you might get the replies in different order than you expect.
participants (2)
-
Timo Sirainen
-
Warren Baker