Bumping this as I'd like to see it land... It's one of the "features" that tends to catch Kafka n00bs unawares and typically results in message skippage/loss, vs the proposed solution is much more intuitive behavior.
Plus it's more wire efficient because consumers no longer need to commit offsets for partitions that have no new messages just to keep those offsets alive. On Fri, Jan 12, 2018 at 10:21 AM, Vahid S Hashemian < vahidhashem...@us.ibm.com> wrote: > There has been no further discussion on this KIP for about two months. > So I thought I'd provide the scoop hoping it would spark additional > feedback and move the KIP forward. > > The KIP proposes a method to preserve group offsets as long as the group > is not in Empty state (even when offsets are committed very rarely), and > start the offset expiration of the group as soon as the group becomes > Empty. > It suggests dropping the `retention_time` field from the `OffsetCommit` > request and, instead, enforcing it via the broker config > `offsets.retention.minutes` for all groups. In other words, all groups > will have the same retention time. > The KIP presumes that this global retention config would suffice common > use cases and does not lead to, e.g., unmanageable offset cache size (for > groups that don't need to stay around that long). It suggests opening > another KIP if this global retention setting proves to be problematic in > the future. It was suggested earlier in the discussion thread that the KIP > should propose a per-group retention config to circumvent this risk. > > I look forward to hearing your thoughts. Thanks! > > --Vahid > > > > > From: "Vahid S Hashemian" <vahidhashem...@us.ibm.com> > To: dev <dev@kafka.apache.org> > Date: 10/18/2017 04:45 PM > Subject: [DISCUSS] KIP-211: Revise Expiration Semantics of Consumer > Group Offsets > > > > Hi all, > > I created a KIP to address the group offset expiration issue reported in > KAFKA-4682: > https://urldefense.proofpoint.com/v2/url?u=https-3A__cwiki. > apache.org_confluence_display_KAFKA_KIP-2D211-253A-2BRevise- > 2BExpiration-2BSemantics-2Bof-2BConsumer-2BGroup-2BOffsets& > d=DwIFAg&c=jf_iaSHvJObTbx-siA1ZOg&r=Q_itwloTQj3_xUKl7Nzswo6KE4Nj- > kjJc7uSVcviKUc&m=JkzH_2jfSMhCUPMk3rUasrjDAId6xbAEmX7_shSYdU4&s= > UBu7D2Obulg0fterYxL5m8xrDWkF_O2kGlygTCWsfFc&e= > > > Your feedback is welcome! > > Thanks. > --Vahid > > > > > > -- *Jeff Widman* jeffwidman.com <http://www.jeffwidman.com/> | 740-WIDMAN-J (943-6265) <><
