Hello,

I am writing some code to enable parallelization for some tool wrappers. First, I did it for simple bwa wrapper, but now I am modifying  toolshed.g2.bx.psu.edu/repos/devteam/bwa/c71dd035971e/bwa/bwa-mem.xml to check if the code would work with this wrapper. So, I wrote some code that I thing was necessary in order to merge some bam and I added the parallelism tag (in bold) to the config file:

<tool id="bwa_mem" name="BWA-MEM" version="0.1">

  <macros>

    <import>bwa_macros.xml</import>

  </macros>

  <requirements>

    <requirement type="package" version="0.7.10.039ea20639">bwa</requirement>

    <requirement type="package" version="1.1">samtools</requirement>

  </requirements>

  <description>- map medium and long reads (&gt; 100 bp) against reference genome</description>

  <parallelism method="multi" split_size="3" shared_inputs="ref_file" split_mode="number_of_parts" merge_outputs="bam_output" split_inputs="fastq_input1,fastq_input2" ></parallelism>

  <command>

...

So, everything works well, and the resulting bam from parallelization mode and without the parallelization mode is the same but the Galaxy log throws an error regarding metadata, it says something like this:

galaxy.jobs.splitters.multi DEBUG 2015-04-17 09:54:58,335 merge finished: /home/ralonso/galaxy/database/files/000/dataset_198.dat

galaxy.jobs.runners.tasks DEBUG 2015-04-17 09:54:58,473 executing external set_meta script for job 200: python /home/ralonso/galaxy/database/tmp/set_metadata_E5fGIE.py /home/ralonso/galaxy/database/tmp/tmpHS8Byo /home/ralonso/galaxy/database/job_working_directory/000/200/galaxy.json /home/ralonso/galaxy/database/tmp/metadata_in_HistoryDatasetAssociation_198_yOGiQG,/home/ralonso/galaxy/database/tmp/metadata_kwds_HistoryDatasetAssociation_198_nAsQoq,/home/ralonso/galaxy/database/tmp/metadata_out_HistoryDatasetAssociation_198_I_cLs4,/home/ralonso/galaxy/database/tmp/metadata_results_HistoryDatasetAssociation_198_qhjzoV,/home/ralonso/galaxy/database/files/000/dataset_198.dat,/home/ralonso/galaxy/database/tmp/metadata_override_HistoryDatasetAssociation_198_ScKLqH

Traceback (most recent call last):

  File "/home/ralonso/galaxy/database/tmp/set_metadata_E5fGIE.py", line 1, in <module>

    from galaxy_ext.metadata.set_metadata import set_metadata; set_metadata()

ImportError: No module named galaxy_ext.metadata.set_metadata

galaxy.jobs.runners.tasks DEBUG 2015-04-17 09:54:58,624 execution of external set_meta finished for job 200

galaxy.datatypes.metadata DEBUG 2015-04-17 09:54:58,714 setting metadata externally failed for HistoryDatasetAssociation 198: External set_meta() not called

When using no parallelization mode, there is no problem, also because Galaxy doesn't go through this part of code, I mean it doesn't execute this.

I see that Galaxy have to do something with metada attributes, but what is t trying to do? is there any way to solve this?

Thank you very much

Regards,