Tickets :: Comment on [#12075] PING-SYNC storm in ActiveSync

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Comment	> Occasionally I see a significant battery drain on my mobile phone > that syncs through ActiveSync. I enabled debugging and found that > during such an event it continuously repeats the same PING-SYNC sycle. > > When it PINGs the server, it will get a reply status of 2 and in the > logs it mentions > > 2013-02-22T14:36:53+01:00 DEBUG: [29575] Initializing state for > collection: Commercieel, synckey: > {512745e0-365c-4a01-9e3f-4202c0a8010a}2 > 2013-02-22T14:36:53+01:00 DEBUG: [29575] Loading state for synckey > {512745e0-365c-4a01-9e3f-4202c0a8010a}2 > 2013-02-22T14:36:53+01:00 DEBUG: [29575] Initializing message diff > engine for Commercieel > 2013-02-22T14:36:53+01:00 DEBUG: [29575] > Horde_Core_ActiveSync_Driver::getServerChanges(Commercieel, > 1361528289, 1361540213, 0, 1) > 2013-02-22T14:36:54+01:00 DEBUG: [29575] Found 1 message changes in > Commercieel. > 2013-02-22T14:36:54+01:00 DEBUG: [29575] No PIM changes present, > returning all messages. > > But when it subsequently attempts to SYNC that folder, no changes are found: > > 2013-02-22T14:36:56+01:00 DEBUG: [29598] Initializing state for > collection: Commercieel, synckey: > {512745e0-365c-4a01-9e3f-4202c0a8010a}2 > 2013-02-22T14:36:56+01:00 DEBUG: [29598] Loading state for synckey > {512745e0-365c-4a01-9e3f-4202c0a8010a}2 > 2013-02-22T14:36:56+01:00 DEBUG: [29598] Initializing message diff > engine for Commercieel > 2013-02-22T14:36:56+01:00 DEBUG: [29598] > Horde_Core_ActiveSync_Driver::getServerChanges(Commercieel, > 1361528289, 1361540216, 1359121016, 0) > 2013-02-22T14:36:57+01:00 DEBUG: IMAP status: Array > ( > [uidnext] => 1349 > [uidvalidity] => 1108813680 > [highestmodseq] => 1506 > ) > > 2013-02-22T14:36:57+01:00 DEBUG: CONDSTORE and CHANGES > 2013-02-22T14:36:57+01:00 DEBUG: [29598] Found 0 message changes in > Commercieel. > > This cycle repeats every few seconds until a new message arrives in > that folder or flags of a message in said folder are changed, after > which the situation is back to normal. It looks like at times the > cached state is out of sync with the IMAP server. > > The problem seems to be triggered by moving or deleting messages from > folders that are synchronized through ActiveSync with a > non-ActiveSync client (I used Horde Webmail). So far it has only > occurred minutes after the phone went from the direct-push to manual > sync mode, but I'm not entirely sure if this is related (the problem > in this case surfaces when the phone goes back to direct-push). But > this may also have to do with when the phone is in direct-push mode, > a human won't be fast enough to beat ActiveSync from keeping up with > the changes on the server.
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