# Changing datatype while job is running

**URL:** <https://help.galaxyproject.org/t/changing-datatype-while-job-is-running/1564>\
**Category:** Uncategorized\
**Tags:** dataset\
**Created:** [June 17, 2019, 2:47pm UTC](https://help.galaxyproject.org/t/changing-datatype-while-job-is-running/1564 "2019-06-17T14:47:01Z")\
**Posts on this page:** 1\
**Showing post:** 2

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**Author:** ![jennaj](https://sea2.discourse-cdn.com/flex020/user_avatar/help.galaxyproject.org/jennaj/32/27_2.png) [@jennaj](https://help.galaxyproject.org/u/jennaj)\
**Post date:** [June 18, 2019, 3:18pm UTC](https://help.galaxyproject.org/t/changing-datatype-while-job-is-running/1564/2 "2019-06-18T15:18:06Z")

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Hello @michele.dellab

The metadata for datasets cannot be changed while a job is using that dataset as an input and it is still running. If you think your inputs are wrong in some way, and need to rerun: delete and purge the job(s) using them, then adjust the format and or datatype.

FAQ: [How do I find, adjust, and/or correct metadata?](https://galaxyproject.org/support/metadata/)

Make sure the datatype fits the actual file format. `HDF5` datasets are not the same as `fastq` datasets.

For an example run of the `Canu` tool, please see this prior post: [Nanopore data assembly with CANU](https://help.galaxyproject.org/t/nanopore-data-assembly-with-canu/921)

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