feat: support partial writes

[alespour]

Proposed Changes

Adds partial-write support with structured error details in InfluxDBPartialWriteError, including per-line line_number, error_message, and original_line so callers can decide whether to drop/retry/fix specific lines in a batch.

This also aligns write routing with the rollout contract:

• Default write endpoint is now /api/v3/write_lp
• accept_partial defaults to True (server default behavior)
• accept_partial=false is sent only when partial writes are explicitly disabled
• New compatibility option use_v2_api routes writes to /api/v2/write for Clustered/v2-compatible backends

Configuration surfaces now include:

• Write option: accept_partial, use_v2_api
• Client config / connection string keys: write_accept_partial, write_use_v2_api
• Environment variables: INFLUX_WRITE_ACCEPT_PARTIAL, INFLUX_WRITE_USE_V2_API

Validation:

• use_v2_api=True with no_sync=True is rejected before request dispatch.

See Partial writes in InfluxDB documentation.

Example:

client = InfluxDBClient3(
    host=host,
    database=database,
    token=token
)

try:
    client.write(lp)  # accept_partial=True by default
except InfluxDBPartialWriteError as err:
    for line_err in err.line_errors:
        print(
            f"line {line_err.line_number} failed: "
            f"{line_err.error_message} ({line_err.original_line})"
        )
except Exception as err:
    print(err)

Optional v2 compatibility mode:

client = InfluxDBClient3(
    host=host,
    database=database,
    token=token,
    write_use_v2_api=True,
)

client.write(lp)

Checklist

• CHANGELOG.md updated
• Rebased/mergeable
• A test has been added if appropriate
• Tests pass
• Commit messages are conventional

[codecov]

Codecov Report

❌ Patch coverage is 92.13483% with 14 lines in your changes missing coverage. Please review.
✅ Project coverage is 75.96%. Comparing base (a1e03da) to head (b514d94).

Files with missing lines	Patch %	Lines
influxdb_client_3/exceptions/exceptions.py	90.75%	11 Missing ⚠️
influxdb_client_3/__init__.py	86.36%	3 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #210      +/-   ##
==========================================
+ Coverage   75.17%   75.96%   +0.79%     
==========================================
  Files          35       35              
  Lines        2417     2559     +142     
==========================================
+ Hits         1817     1944     +127     
- Misses        600      615      +15     

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[Copilot]

Pull request overview

This PR adds client-side support for InfluxDB v3 partial writes by introducing a structured InfluxDBPartialWriteError (with per-line error details) and updates write routing/options to default to the v3 /api/v3/write_lp endpoint while allowing an opt-in v2 compatibility route (/api/v2/write).

Changes:

• Add InfluxDBPartialWriteError/InfluxDBPartialWriteLineError and parse v3 partial-write error payloads into structured line-level failures.
• Default write routing to /api/v3/write_lp, add accept_partial (default True) and use_v2_api (default False) write options with env/kwarg support.
• Update unit/integration tests and README to cover the new defaults and new error/option behavior.

Reviewed changes

Copilot reviewed 11 out of 11 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
tests/test_write_local_server.py	Updates expected endpoints/query params for v3 defaults; adds coverage for accept_partial and use_v2_api routing/validation.
tests/test_polars.py	Adjusts mocked write call expectations to include new write kwargs.
tests/test_influxdb_client_3.py	Verifies new default write options and env parsing for accept_partial/use_v2_api.
tests/test_influxdb_client_3_integration.py	Updates integration test to expect InfluxDBPartialWriteError for invalid LP scenarios.
tests/test_api_client.py	Expands API error parsing tests to validate partial-write parsing and typed/raw fallback behavior.
README.md	Documents partial-write handling and v2 compatibility mode configuration.
influxdb_client_3/write_client/service/write_service.py	Routes writes to v3 by default, adds v2 compatibility routing and partial-write error translation.
influxdb_client_3/write_client/client/write_api.py	Adds new defaults/options, validates invalid combinations, and threads new params through write dispatch.
influxdb_client_3/exceptions/exceptions.py	Implements partial-write detection/parsing, structured error classes, and improved message formatting.
influxdb_client_3/exceptions/init.py	Re-exports the new partial-write exception types.
influxdb_client_3/init.py	Adds env/kwarg configuration keys for new write options and updates error imports/handling.

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[Copilot]

Pull request overview

Copilot reviewed 11 out of 11 changed files in this pull request and generated 2 comments.

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