fix: cap the org import's ClickHouse insert block size, and bump to 2026-07-26-003 - #50
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- Updated image tag to 2026-07-26-003 in values.yaml and documentation. - Added new configuration for ClickHouse insert block size in values.yaml and documentation. - Updated toolbox pod template to include environment variable for ClickHouse insert block size.
📝 WalkthroughWalkthroughThe Helm chart advances to version 0.7.4 and image ChangesCurrents chart release and ClickHouse import sizing
Estimated code review effort: 2 (Simple) | ~10 minutes Mergeability Score: 🟡 Moderate · up to The change adds a safer ClickHouse block-size default, but the documented commands force 65536 and can override an operator’s lower configured value, potentially reintroducing memory failures; the documentation examples and lint errors should be corrected before merging. Possibly related PRs
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Inline comments:
In `@docs/org-data-import.md`:
- Around line 209-212: Update both diagnostic output code fences in the
documentation, including the ClickHouse and MongoDB blocks, to specify the text
language tag and satisfy the markdown lint requirement.
- Around line 107-109: Update all standard CLI examples in the org-data import
documentation for fresh, merge, incremental, and both resume flows so they do
not hardcode --insert-block-rows=65536; remove the flag to rely on the pod
environment, or replace it with a clearly documented placeholder tied to
toolbox.clickhouseInsertBlockRows.
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charts/currents/Chart.yamlcharts/currents/templates/toolbox/pod.yamlcharts/currents/values.yamldocs/configuration.mddocs/org-data-import.md
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Bumps the app image to
2026-07-26-003(chart0.7.4), and caps how much memory the orgimport can ask of ClickHouse.
Why
A customer's incremental import failed repeatedly with
MEMORY_LIMIT_EXCEEDED (21.74 GiB used, 21.60 GiB max)on the ClickHouse step. Two separatethings made that possible:
blocks up to its own 1M-row default. Every block is aggregated by
test_metric_v2's twomaterialized views as it lands, so that alone peaks at ~3.1 GiB — enough to be a large
fraction of a modest ClickHouse.
--insert-block-rowsflag that fixes it existed but appeared nowhere in the importguide, so nobody passes it until an import has already failed.
The customer's specific failure was a third thing (an unbounded skip-existing check, fixed
app-side in currents-dev/currents#3414 and carried by this image bump). This PR is about the
other two: making the memory cap the default, and documenting the failure so the next customer
diagnoses it in one step instead of a support thread.
Changes
Chart
values.yaml— newtoolbox.clickhouseInsertBlockRows, default65536.templates/toolbox/pod.yaml— renders it asCLICKHOUSE_MIN_INSERT_BLOCK_SIZE_ROWS, whichch-importalready reads. Follows theclickhouseRequestTimeoutMsenv directly above it.The
--insert-block-rowsflag still takes precedence when passed.Chart.yaml—version0.7.3 → 0.7.4,appVersion→2026-07-26-003. The version bump isrequired: 0.7.3 is already released and
chart-releaserruns withskip_existing: true, sowithout it none of this publishes.
docs/configuration.md— regenerated with the repo's helm-docs invocation.Setting this chart-side rather than only in the docs means the cap applies even when someone
copies an older command out of a runbook or a Slack thread.
docs/org-data-import.md--insert-block-rows=65536in all five example commands (fresh, merge, incremental, and bothch-importresume commands).actually set — an unlimited pod sizes itself against the whole node, never trips its own
memory guard, and gets killed by the kernel mid-import instead of failing one query cleanly.
MEMORY_LIMIT_EXCEEDED: halve the block size first, and thediagnostic that separates the two causes — if halving changes nothing and it fails at the
same size, block size is not the allocation and no value will fix it.
N document(s) failed to restoreduplicate-key output, which is expected on a re-run and is what alarmed this customer.
Why 65536
Measured, not guessed.
test_metric_v2and both materialized views were rebuilt in a scratchdatabase from a real server's DDL, then 973k real rows (one org, 31 monthly partitions — the
shape of an actual import) were inserted once per block size, reading peak
memory_usagefromsystem.query_log:min_insert_block_size_rows65536 leaves an 8 GiB ClickHouse room for queries and background merges, and is faster than
the default, so there is no throughput argument against it. A customer's rows can be fatter than
this dataset's (~1.25 KB/row), which is why the docs tell them to halve it rather than treating
1.34 GiB as a guarantee.
Testing
Review hints
templates/toolbox/pod.yamlis the only behaviour change — everything else is defaults, docs,and generated output. Worth confirming the env name matches what
ch-importreads(
CLICKHOUSE_MIN_INSERT_BLOCK_SIZE_ROWS) and that flag-over-env precedence is what we want.Chart.yamlversion bump is load-bearing for release; see the note above.MEMORY_LIMIT_EXCEEDEDentry tells customers to ask support for a newer image. Thatadvice is only true once currents-dev/currents#3414 is merged and built into an image at
or after
2026-07-26-003— worth confirming before this ships.Summary by CodeRabbit