[RFC] Offloaded Raw Literals #5103
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fg91
reviewed
Jul 18, 2024
rfc/system/5103-offloaded-literal.md
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| ## 3 Proposed Implementation | ||
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| ### 3.1 Offloaded Literal IDL | ||
| To the `Literal` [message](https://github.com/flyteorg/flyte/blob/cb6384ac6ea60f8b9421a71cfda4279f3579d3cb/flyteidl/protos/flyteidl/core/literals.proto#L95), add a new field called `starp` that will point to a location in the "metadata" bucket of the Flyte backend. The offloaded bytes should be deserialzable into a `Literal` object. |
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*p i'm bad with names. this will definitely change.
fg91
reviewed
Jul 18, 2024
rfc/system/5103-offloaded-literal.md
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| Questions: How will things like metadata be handled? Should they be merged? What should be in the `value` field of the main parent Literal? | ||
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| ### 3.2 Flyte Propeller | ||
| * When writing map task outputs, depending on the size, Propeller will need to offload the LiteralCollection after constructing it, and create a new Literal for downstream tasks to use, with the |
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Suggested change
| * When writing map task outputs, depending on the size, Propeller will need to offload the LiteralCollection after constructing it, and create a new Literal for downstream tasks to use, with the | |
| * When writing map task outputs, depending on the size, Propeller will need to offload the LiteralCollection after constructing it, and create a new Literal for downstream tasks to use. |
Incomplete?
fg91
reviewed
Jul 18, 2024
rfc/system/5103-offloaded-literal.md
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| ### 3.2 Flyte Propeller | ||
| * When writing map task outputs, depending on the size, Propeller will need to offload the LiteralCollection after constructing it, and create a new Literal for downstream tasks to use, with the | ||
| * Also Propeller will need to check the flytekit version of the map task. If it's an older version (i.e. before the change proposed in this RFC), and it's large enough to need to be offloaded, it should fail the task. The assumption here is that if the map task is of the older version then downstream tasks will probably also be of those older versions which won't know how to resolved these offloaded literals. |
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Suggested change
| * Also Propeller will need to check the flytekit version of the map task. If it's an older version (i.e. before the change proposed in this RFC), and it's large enough to need to be offloaded, it should fail the task. The assumption here is that if the map task is of the older version then downstream tasks will probably also be of those older versions which won't know how to resolved these offloaded literals. | |
| * Also, Propeller will need to check the flytekit version of the map task. If it's an older version (i.e. before the change proposed in this RFC), and it's large enough to need to be offloaded, it should fail the task. The assumption here is that if the map task is of the older version then downstream tasks will probably also be of those older versions which won't know how to resolve these offloaded literals. |
fg91
reviewed
Jul 18, 2024
rfc/system/5103-offloaded-literal.md
Outdated
| For large outputs (like large maps of large dataclasses), Flytekit should also know how to offload the data. This should be done transparently to the user. How will propeller know to fail though if propeller hasn't been updated? | ||
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| ### 3.4 Other Implications | ||
| Does console need to change at all? |
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As a user clicking on the inputs tab of a node, I'd expect to see the string representation of the Literal including the blob storage uri the literal has been offloaded to.
It would be nice to see the type of the literal as is for example already the case when e.g. a pytorch module or pickled object is offloaded (with the only difference that the offloading happens in the respective type transformer in flytekit and not in propeller of course).
This goes into the direction of this question posed above:
Questions: How will things like metadata be handled? Should they be merged? What should be in the
valuefield of the main parent Literal?
fg91
reviewed
Jul 18, 2024
| * For map tasks, change the type of the output to a Union of the current user defined List and a new Offloaded type. We felt this would be a bit awkward since it changes the user-facing type itself (like if you were to pull up the map task definition in the API endpoint). It's also not extensible to other types of literals (maps of large dataclasses for example). | ||
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| * Build off of the input wrapper construct that's still in PR. The idea was to have the wrapper contain in large cases, a reference to the data, and in small cases, the data itself. We didn't fully like this idea because the entire input set or output set needs to be offloaded. | ||
| * If the task downstream of a map task takes both the output list, along with some other input, after creating and upload the large pb file for the map task's output, Propeller would need to re-upload the entire large list or map (one time for each downstream task). If the offloading is done per literal, Propeller can just upload once and use. |
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Suggested change
| * If the task downstream of a map task takes both the output list, along with some other input, after creating and upload the large pb file for the map task's output, Propeller would need to re-upload the entire large list or map (one time for each downstream task). If the offloading is done per literal, Propeller can just upload once and use. | |
| * If the task downstream of a map task takes both the output list, along with some other input, after creating and uploading the large pb file for the map task's output, Propeller would need to re-upload the entire large list or map (one time for each downstream task). If the offloading is done per literal, Propeller can just upload once and use. |
fg91
reviewed
Jul 18, 2024
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| ## 8 Unresolved questions | ||
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| Should we create a new oneof that's offloaded? |
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Signed-off-by: Yee Hing Tong <[email protected]>
Signed-off-by: Yee Hing Tong <[email protected]>
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Signed-off-by: Katrina Rogan <[email protected]>
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This was referenced Aug 27, 2024
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eapolinario
approved these changes
Sep 23, 2024
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09/26/2024 Contributors sync notes: @eapolinario et. al. to update this proposal with the changes from the Union internal discussions. |
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