# Known issues — preview release

This page documents known issues and limitations in the **Preview** release of the Developer SDK.

::: coming soon
This page is under development. Content will include:

-   Current limitations
-   Known bugs with workarounds
-   Planned fixes for GA
:::

## Limitations

| Limitation | Impact | Workaround | Target Fix |
| --- | --- | --- | --- |
| Preview AEL surface is narrower than the post-preview language spec (for example regex `=~` and expanded string/path function families) | Some advanced expression patterns are unavailable in preview docs/examples | Use currently documented AEL operators or the raw `Exp` API where needed | GA |
| Batch size limited to 5000 | Large batches fail with error | Split into smaller batches | GA |
| No UDF support | Cannot execute user-defined functions | Use classic client for UDFs | Post-GA |

## Known bugs

| Issue | Description | Workaround | Status |
| --- | --- | --- | --- |
| — | — | — | — |

## Deprecated features

No features are deprecated in this preview release.

## Reporting issues

If you encounter an issue not listed here:

-   **Java**: [github.com/aerospike/aerospike-client-java-fluent/issues](https://github.com/aerospike/aerospike-client-java-fluent/issues)
-   **Python**: [github.com/aerospike/aerospike-fluent-client-python/issues](https://github.com/aerospike/aerospike-fluent-client-python/issues)

When reporting, please include:

1.  Client version and language
2.  Server version
3.  Minimal reproduction steps
4.  Full error message and stack trace

## Next steps

-   [Common Issues](https://aerospike.com/docs/develop/client/sdk/reference/common-issues)
-   [Quickstart](https://aerospike.com/docs/develop/client/sdk/quickstart)