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From "Berislav Lopac (JIRA)" <j...@apache.org>
Subject [jira] [Work started] (AIRFLOW-2222) GoogleCloudStorageHook.copy fails for large files between locations
Date Tue, 17 Apr 2018 09:07:00 GMT

     [ https://issues.apache.org/jira/browse/AIRFLOW-2222?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Work on AIRFLOW-2222 started by Berislav Lopac.
-----------------------------------------------
> GoogleCloudStorageHook.copy fails for large files between locations
> -------------------------------------------------------------------
>
>                 Key: AIRFLOW-2222
>                 URL: https://issues.apache.org/jira/browse/AIRFLOW-2222
>             Project: Apache Airflow
>          Issue Type: Bug
>            Reporter: Berislav Lopac
>            Assignee: Berislav Lopac
>            Priority: Major
>
> When copying large files (confirmed for around 3GB) between buckets in different projects,
the operation fails and the Google API returns error [413—Payload Too Large|https://cloud.google.com/storage/docs/json_api/v1/status-codes#413_Payload_Too_Large].
The documentation for the error says:
> {quote}The Cloud Storage JSON API supports up to 5 TB objects.
> This error may, alternatively, arise if copying objects between locations and/or storage
classes can not complete within 30 seconds. In this case, use the [Rewrite|https://cloud.google.com/storage/docs/json_api/v1/objects/rewrite]
method instead.{quote}
> The reason seems to be that the {{GoogleCloudStorageHook.copy}} is using the API {{copy}}
method.
> h3. Proposed Solution
> There are two potential solutions:
> # Implement {{GoogleCloudStorageHook.rewrite}} method which can be called from operators
and other objects to ensure successful execution. This method is more flexible but requires
changes both in the {{GoogleCloudStorageHook}} class and any other classes that use it for
copying files to ensure that they explicitly call {{rewrite}} when needed.
> # Modify {{GoogleCloudStorageHook.copy}} to determine when to use {{rewrite}} instead
of {{copy}} underneath. This requires updating only the {{GoogleCloudStorageHook}} class,
but the logic might not cover all the edge cases and could be difficult to implement.



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