Notes - Nov 26 2018

Robert Stepanek rsto at
Tue Nov 27 08:05:47 EST 2018

Hi Anatoli,

no, what I am working is rather the opposite: the current implementation
uses exclusive locks on mailboxes where it could do away with a shared
read-only lock. That's because the  Cyrus DB API currently does not
support shared locks.
We want to reduce latency of  requests, and that's what I am optimizing
for. The work only touches the twoskip backend and is only for certain
hot-paths in the code.

On Tue, Nov 27, 2018, at 1:50 PM, Anatoli wrote:
> Hi All!
>  Robert, is your work on read-only cyrusdb locks somehow related to
>  the global lock feature
>  (> 
>  Regards,
>  Anatoli
> *From:* Robert Stepanek
> *Sent:* Monday, November 26, 2018 18:40
> *To:* Cyrus Devel
> *Subject:* Notes - Nov 26 2018
> Participants: Bron, Ellie, Ken, Partha, Robert
> Ken:
> - Short week for US.
> - Mainly working on mailbox by id. Some Cassandane tests fail, more a
>   matter of fixing them instead Cyrus code.> - Annotations.db needs to use ids instead of mailbox names. Same for
>   conversations.db.> - RENAME should become fairly trivial, with reduced IO overhead.
> - Before continuing with mailbox by id : need to update RFC drafts.
> - Issue with building a SASL distribution on Fedora (due to Sphinx)
> Bron:
> - New Cyrus rolled out yesterday, along with changes to frontend and
>   middleware.> - Fixed JMAP bugs that crept in with commits last week.
> Ellie:
> - IMAP labels patch updated after review, ready to merge.
> - SASL: distcheck is flaky on Windows. Haven't looked into it, yet.
> Robert:
> - Short week as well, was ill.
> - Fixed JMAP bugs and updated JSCalendar v8 implementation.
> - JSCalendar RFC is in last call at IETF!
> - JMAP Quota patch updated. JMAP part is trivial, but quotamodseq
>   touches lots of critical areas: sync, mboxevent, counters. Bron
>   volunteered to review.> - Now working on read-only cyrusdb locks: only for cyrusdb_open and
>   twoskip.> 
> Partha: 
> - Zeroskip is part of cyruslibs. Unit tests checked on
> - How to inspect zeroskip binary format for debugging? Either use zeroskip-
>   inluded tooling to dump db, or use cvt_cyrusdb binary.
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