Glances
Glances 4.5.9 closes out the 4.x line as a 5.0 beta opens for testing.
Comparison · Analytics
Cortex vs Delta Lake
A side-by-side editorial comparison of Cortex and Delta Lake — release velocity, themes, recent moves, and the top alternatives to consider.
Cortex vs Delta Lake: at a glance
What is Cortex?
Cortex 1.22 is on its fourth candidate, with sharded Parquet and years of deprecated flags removed.
Cortex 1.22.0 has been in release candidates since 12 September, reaching rc.3 on 6 October, and GitHub shows no final yet. The candidate adds sharded Parquet conversion and querying, resource-based query eviction that cancels the heaviest query when CPU or heap crosses a threshold, OCI Object Storage as a backend, and an active-series tracker per tenant. It also removes long-deprecated flags and config fields, some of which now stop Cortex from starting if left in place.
What is Delta Lake?
Delta Lake's public stream is Databricks builds and code cleanup on the way to 4.5.
Recent Delta Lake activity is release mechanics. The newest entries are a Delta Kernel 4.5.0 Databricks build, the removal of unused V2 streaming snapshot code, and CI changes that pause idle source-build jobs now that Spark 4.0 to 4.3 use published artifacts. The last user-facing fix in the window is still 3.3.3's log cleanup correction.
Cortex vs Delta Lake: editorial side-by-side
Cortex
2.5ANALYTICS
Cortex 1.22 is on its fourth candidate, with sharded Parquet and years of deprecated flags removed.
◆ Current state
Cortex 1.22.0 has been in release candidates since 12 September, reaching rc.3 on 6 October, and GitHub shows no final yet. The candidate adds sharded Parquet conversion and querying, resource-based query eviction that cancels the heaviest query when CPU or heap crosses a threshold, OCI Object Storage as a backend, and an active-series tracker per tenant. It also removes long-deprecated flags and config fields, some of which now stop Cortex from starting if left in place.
◆ Where it's heading
The storage arc toward Parquet continues: after 1.21 made Parquet a Store Gateway query mode, 1.22 shards files that exceed column limits. A second arc is protecting shared clusters from heavy tenants, through query eviction, resource-based throttling and concurrent data-byte limits on store gateways. The cleanup is the maturity arc from 1.21 carried further: no-op flags that were tolerated for releases now fail at startup.
◆ Prediction
1.22.0 final should follow rc.3, which added only two fixes. Operators should expect upgrade failures from leftover deprecated flags, and the release notes tell them to grep runtime configs before upgrading.
Delta Lake
5.0ANALYTICS
Delta Lake's public stream is Databricks builds and code cleanup on the way to 4.5.
◆ Current state
Recent Delta Lake activity is release mechanics. The newest entries are a Delta Kernel 4.5.0 Databricks build, the removal of unused V2 streaming snapshot code, and CI changes that pause idle source-build jobs now that Spark 4.0 to 4.3 use published artifacts. The last user-facing fix in the window is still 3.3.3's log cleanup correction.
◆ Where it's heading
The 4.5 line is being prepared in the open through kernel builds and cleanup, with the Spark connector consolidating V2 streaming onto the V1 snapshot path. The feed shows no 4.5 release notes yet.
◆ Prediction
A 4.5.0 release candidate or tag is the next visible step; until then expect more kernel builds and cleanup PRs.
Alternatives to Cortex and Delta Lake
Other Analytics products tracked by Sparkpulse, ranked by recent ship velocity. Each card links to a full editorial trajectory and lets you pivot into a head-to-head comparison with either Cortex or Delta Lake.
Calibre
Calibre MCP lets your coding agent read RUM and Lighthouse data, then fix the slow code
Dovetail
Dovetail opens its docs to Claude and ChatGPT as co-authors.
Apache SkyWalking
SkyWalking 11.1 builds service maps from OpenTelemetry traces, no SkyWalking agent required.
OpenReplay
OpenReplay's feed is Helm chart bumps behind its asset-cacher deny list.
Tinybird
Tinybird shrinks its Local image by a third after a run of observability updates.
See all Cortex alternatives → · See all Delta Lake alternatives →
Recent activity from Cortex and Delta Lake
Latest ship moves from both products, interleaved chronologically. ⚡ = editorial spark.
- 3d agoDelta LakeDelta Kernel 4.5.0 Databricks build, November 6
- 4d agoDelta LakeSpark connector drops unused V2 streaming snapshot code
- 5d agoDelta LakeIdle Spark source-build CI jobs paused
- 5d agoDelta LakeDelta Kernel 4.5.0 Databricks build stamped
- 28d agoDelta LakeDelta Kernel 4.5.0 Databricks runtime build
- 1mo agoCortex1.22 candidate 4 fixes tenant-deletion cleanup on GCS and Azure
- 1mo agoDelta LakeDelta Lake 4.4.1 patch release tagged
- 1mo agoCortex1.22 candidate 3 fixes the ingestion-delay histogram
- 1mo agoCortex1.22 candidate 2 adds three bug fixes
- 1mo agoCortex1.22 candidate: sharded Parquet, query eviction, OCI storage
- 5mo agoCortex1.21.1 candidate hardens gossip, ingestion and status pages
- 6mo agoCortex1.21.0-rc.1 fixes memberlist, tenant federation and a memory leak
Frequently asked questions
What is the difference between Cortex and Delta Lake?
They serve adjacent needs but don't currently overlap on shipped themes. Delta Lake is currently shipping more aggressively (velocity 5.0 vs 2.5), with 0 editorial sparks in the last 30 days against 0. See the at-a-glance table above for a side-by-side breakdown of velocity, recent sparks, and editorial themes.
Is Cortex better than Delta Lake?
Sparkpulse doesn't pick a winner — we score release velocity, not feature parity. Delta Lake is currently shipping more aggressively (velocity 5.0 vs 2.5), with 0 editorial sparks in the last 30 days against 0. For your specific use case, the alternatives sections above list other Analytics products to evaluate alongside.
What are the best alternatives to Cortex?
Top Cortex alternatives in Analytics are ranked by recent ship velocity. Browse the "Cortex alternatives" section above for the current picks, or visit /alternatives/cortex-metrics for the full list with editorial commentary on each.
What are the best alternatives to Delta Lake?
Top Delta Lake alternatives in Analytics are ranked by recent ship velocity. Browse the "Delta Lake alternatives" section above for the current picks, or visit /alternatives/delta-lake for the full list with editorial commentary on each.