Meeting Schedule and Attendance
DSpace Developer meetings are a time when Committers and interested Developers can discuss new software features, upcoming releases of DSpace software, and generally plan out the roadmap of DSpace. All meetings are public. We welcome anyone and everyone to attend, speak their opinions or just listen in on the discussions. Please note that we archive all discussions (see Meeting Archives), as a service for those who are unable to attend.
DSpace Developer meetings take place on the following schedule:
- Every Wednesday, alternating between 15:00 UTC and 20:00 UTC (every other week) in #duraspace IRC channel or in #dev-mtg Slack channel (these channels sync all discussions)
- To determine which time we are meeting at during a given week, please view the DuraSpace Public Events Calendar (iCal, RSS Feed)
- Also, see the world clock (for 15:00 UTC or 20:00 UTC) to determine the meeting time where you live. If you are unsure how to connect to IRC, see our list of IRC Resources & Clients
- All meetings are held for 1 hour (although, admittedly, discussion sometimes extends beyond that)
Meeting topics often include:
- Recent updates on upcoming DSpace releases, bug fixes or features
- Reviewing of recent reported issues/bugs/feature requests (see JIRA Cleanup Sessions for more info)
- Occasionally we vote or make decisions on upcoming DSpace technology plans/roadmap (see Developer Voting Procedures for more info)
If you are unable to attend a meeting, please feel free to add your own notes/comments to the meeting's wiki page.
Today's Meeting Times
The meeting on Weds, Feb 20 at 15UTC has been CANCELLED (see notes below). Our next meeting will be on Weds, Feb 27 at 20 UTC.
Friendly reminders of upcoming meetings, discussions etc
- DSpace 7 Working Group: Next meeting is Thurs, Feb 14 at 15:00 UTC. Agenda: 2019-02-14 DSpace 7 Working Group Meeting
DSpace 7 Entities Working Group: Next meeting on Tues, Feb 19 at 16:00 UTC
- Last meeting notes at 2019-02-05 DSpace 7 Entities WG Meeting
- DSpace Developer Show and Tell Meetings: On hold until interesting topics arise.
If you have a topic you'd like to have added to the agenda, please just add it.
(Ongoing Topic) DSpace 6.x Status Updates for this week
- 6.4 will surely happen at some point, but no definitive plan or schedule at this time. Please continue to help move forward / merge PRs into the dspace-6.x branch, and we can continue to monitor when a 6.4 release makes sense.
Meeting on Weds, Feb 20 (Next Week)
- Tim will be unable to attend (conflict with DSpace Steering Meeting)
- Should we cancel? Or will someone else volunteer to chair the meeting?
- Upgrading Solr Server for DSpace (Mark H. Wood )
- PR https://github.com/DSpace/DSpace/pull/2058
- Docker configuration for external Solr
- The Dockerfile creates a new solr instance with 4 cores. It then overlays the schema and config changes in PR 2058.
- I attempted to create my branch so that I could create a PR back to Mark's branch, but some other changes from master seem to be showing up if I create a PR.
- This will need a small change to our docker compose files to invoke the external solr service. https://github.com/DSpace-Labs/DSpace-Docker-Images/pull/79
- DSpace Backend as One Webapp (Tim Donohue )
- PR: https://github.com/DSpace/DSpace/pull/2265 (PR is in a reviewable state. SWORDv1 and SWORDv2 are merged into "Spring REST" webapp, with basic Integration Tests to prove both work)
- DSpace Docker and Cloud Deployment Goals (Terry Brady )
- Brainstorms / ideas (Any quick updates to report?)
- (On Hold, pending Steering/Leadership approval) Follow-up on "DSpace Top GitHub Contributors" site (Tim Donohue ): https://tdonohue.github.io/top-contributors/
- Bulk Operations Support Enhancements (from Mark H. Wood)
- Curation System Needs (from Mark H. Wood )
- PR 2180 improves reporting. Ready for review.
- Tickets, Pull Requests or Email threads/discussions requiring more attention? (Please feel free to add any you wish to discuss under this topic)
These topics are ones we've touched on in the past and likely need to revisit (with other interested parties). If a topic below is of interest to you, say something and we'll promote it to an agenda topic!
- Management of database connections for DSpace going forward (7.0 and beyond). What behavior is ideal? Also see notes at DSpace Database Access
- In DSpace 5, each "Context" established a new DB connection. Context then committed or aborted the connection after it was done (based on results of that request). Context could also be shared between methods if a single transaction needed to perform actions across multiple methods.
- In DSpace 6, Hibernate manages the DB connection pool. Each thread grabs a Connection from the pool. This means two Context objects could use the same Connection (if they are in the same thread). In other words, code can no longer assume each
new Context()is treated as a new database transaction.
- Should we be making use of
SessionFactory.openSession()for READ-ONLY Contexts (or any change of Context state) to ensure we are creating a new Connection (and not simply modifying the state of an existing one)? Currently we always use
SessionFactory.getCurrentSession()in HibernateDBConnection, which doesn't guarantee a new connection: https://github.com/DSpace/DSpace/blob/dspace-6_x/dspace-api/src/main/java/org/dspace/core/HibernateDBConnection.java
- Should we be making use of
- Bulk operations, such as loading batches of items or doing mass updates, have another issue: transaction size and lifetime. Operating on 1 000 000 items in a single transaction can cause enormous cache bloat, or even exhaust the heap.
- Bulk loading should be broken down by committing a modestly-sized batch and opening a new transaction at frequent intervals. (A consequence of this design is that the operation must leave enough information to restart it without re-adding work already committed, should the operation fail or be prematurely terminated by the user. The SAF importer is a good example.)
- Mass updates need two different transaction lifetimes: a query which generates the list of objects on which to operate, which lasts throughout the update; and the update queries, which should be committed frequently as above. This requires two transactions, so that the updates can be committed without ending the long-running query that tells us what to update.
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Newly created tickets this week:Click here to expand...
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Notes and Transcripts from all recent Developers Meetings are available off of the Developer Meeting Archives page.