Issue while re-starting Streaming DLT pipeline - PUBSUB

[Ajay-Pandey]

I am not able to restart our streaming DLT pipeline as it's giving "__tmp_path_dir" number format error, I am using PUB-SUB as a source for streaming.

Any solutions will help -

#pusub #databricks

[Amine]

Hello,

It seems there is an exception within the pipeline code.

Can you provide the partial source code of the pipeline?

[Ajay-Pandey]

Hi @Amine ,

I think there is no issue with the code but still am attaching the snapshot of the code below- 

[Kaniz]

Hi @Ajay-Pandey, The "__tmp_path_dir" number format error you're encountering might be due to a stale disk cache or missing underlying files. You can try to resolve this issue by performing the following steps:

1. Invalidate Disk Cache: You can invalidate the disk cache manually by restarting the cluster. This will refresh the stale disk cache and might solve your issue.

2. Check for Missing Files: The error might be due to missing files in the streaming source checkpoint directory. This directory contains important default options for the stream; if files are missing, the stream might not restart. Verify if all necessary files are present.

3. Check for Schema Changes: If the schema of your source data has changed, you might need to enable schema inference with Auto Loader. This will automatically restart your stream when the schema of your source data changes. 

[Ajay-Pandey]

Hi @Kaniz ,

I am using DLT to fetch data from PUBSUB streaming, issue is not related to the checkpoint as DLT automatically maintains all the checkpoints or invalid disk cache as I restart the DLT pipeline that creates a new cluster every time. Also, I have checked and found no schema changes in my data.

I am running the same code on normal cluster with PUBSUB streaming and it's working fine there the issue is only when I am running it through DLT.

[Ajay-Pandey · Accepted solution]

@Kaniz @Amine