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From "ASF GitHub Bot (JIRA)" <>
Subject [jira] [Commented] (AIRFLOW-3205) GCS: Support multipart upload
Date Tue, 23 Oct 2018 10:26:00 GMT


ASF GitHub Bot commented on AIRFLOW-3205:

chronitis opened a new pull request #4084: [AIRFLOW-3205] Support multipart uploads to GCS
   Cloud Storage supports resumable/multipart uploads for large files,
   which can be used to avoid limitations on the size of a single HTTP
   request, or by adding a retry behaviour, increase the reliability of
   large transfers.
   Make sure you have checked _all_ steps below.
   ### Jira
   - [x] My PR addresses the following [Airflow Jira](
issues and references them in the PR title:
   ### Description
   - [x] Here are some details about my PR, including screenshots of any UI changes:
   The current `gcs_hook` only supports single-part uploads, which limits the ultimate size
of any single file upload to that which the SSL library supports in a single request, and
may also lead to issues where the network is not wholly reliable and very long-living connections
may be more likely to fail. This adds support for multipart uploads (uploading a single file,
with the actual transport split into multiple HTTP requests), and retries (using the retry
functionality from the `google-api-python-client` library).
   ### Tests
   - [x] My PR adds the following unit tests __OR__ does not need testing for this extremely
good reason:
   Tests for upload behavior (both multipart and single part) have been added to `tests.contrib.hooks.test_gcs_hook`.
   ### Commits
   - [x] My commits all reference Jira issues in their subject lines, and I have squashed
multiple commits if they address the same issue. In addition, my commits follow the guidelines
from "[How to write a good git commit message](":
     1. Subject is separated from body by a blank line
     1. Subject is limited to 50 characters (not including Jira issue reference)
     1. Subject does not end with a period
     1. Subject uses the imperative mood ("add", not "adding")
     1. Body wraps at 72 characters
     1. Body explains "what" and "why", not "how"
   ### Documentation
   - [x] In case of new functionality, my PR adds documentation that describes how to use
     - When adding new operators/hooks/sensors, the autoclass documentation generation needs
to be added.
   The added arguments are documented in the hook `upload` method. I haven't explicitly added
all these arguments to classes which use the hook.
   ### Code Quality
   - [x] Passes `flake8`

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> GCS: Support multipart upload
> -----------------------------
>                 Key: AIRFLOW-3205
>                 URL:
>             Project: Apache Airflow
>          Issue Type: Improvement
>          Components: gcp
>            Reporter: Gordon Ball
>            Priority: Minor
> GoogleCloudStorageHook currently only provides support for uploading files in a single
HTTP request. This means that loads fail with SSL errors for files larger than 2GiB (presumably
a int32 overflow, might depend on which SSL library is being used). Multipart uploads should
be supported to allow large uploads, and possibly increase reliability for smaller uploads.

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