---
layout: default
navsection: userguide
-title: "Writing a CWL workflow"
+title: "Developing workflows with CWL"
...
{% comment %}
Copyright (C) The Arvados Authors. All rights reserved.
h2. Developing workflows
-For an introduction and and detailed documentation about writing CWL, see the "CWL User Guide":https://www.commonwl.org/user_guide and the "CWL Specification":http://commonwl.org/v1.1 .
+For an introduction and and detailed documentation about writing CWL, see the "CWL User Guide":https://www.commonwl.org/user_guide and the "CWL Specification":http://commonwl.org/v1.2 .
See "Writing Portable High-Performance Workflows":{{site.baseurl}}/user/cwl/cwl-style.html and "Arvados CWL Extensions":{{site.baseurl}}/user/cwl/cwl-extensions.html for additional information about using CWL on Arvados.
See "Software for working with CWL":https://www.commonwl.org/#Software_for_working_with_CWL for links to software tools to help create CWL documents.
-h2. Using Composer
-
-You can create new workflows in the browser using "Arvados Composer":{{site.baseurl}}/user/composer/composer.html
-
-h2. Registering a workflow to use in Workbench
-
-Use @--create-workflow@ to register a CWL workflow with Arvados. This enables you to share workflows with other Arvados users, and run them by clicking the <span class="btn btn-sm btn-primary"><i class="fa fa-fw fa-gear"></i> Run a process...</span> button on the Workbench Dashboard and on the command line by UUID.
-
-<notextile>
-<pre><code>~/arvados/doc/user/cwl/bwa-mem$ <span class="userinput">arvados-cwl-runner --create-workflow bwa-mem.cwl</span>
-arvados-cwl-runner 1.0.20160628195002, arvados-python-client 0.1.20160616015107, cwltool 1.0.20160629140624
-2016-07-01 12:21:01 arvados.arv-run[15796] INFO: Upload local files: "bwa-mem.cwl"
-2016-07-01 12:21:01 arvados.arv-run[15796] INFO: Uploaded to zzzzz-4zz18-7e0hedrmkuyoei3
-2016-07-01 12:21:01 arvados.cwl-runner[15796] INFO: Created template zzzzz-p5p6p-rjleou1dwr167v5
-zzzzz-p5p6p-rjleou1dwr167v5
-</code></pre>
-</notextile>
-
-You can provide a partial input file to set default values for the workflow input parameters. You can also use the @--name@ option to set the name of the workflow:
-
-<notextile>
-<pre><code>~/arvados/doc/user/cwl/bwa-mem$ <span class="userinput">arvados-cwl-runner --name "My workflow with defaults" --create-workflow bwa-mem.cwl bwa-mem-template.yml</span>
-arvados-cwl-runner 1.0.20160628195002, arvados-python-client 0.1.20160616015107, cwltool 1.0.20160629140624
-2016-07-01 14:09:50 arvados.arv-run[3730] INFO: Upload local files: "bwa-mem.cwl"
-2016-07-01 14:09:50 arvados.arv-run[3730] INFO: Uploaded to zzzzz-4zz18-0f91qkovk4ml18o
-2016-07-01 14:09:50 arvados.cwl-runner[3730] INFO: Created template zzzzz-p5p6p-0deqe6nuuyqns2i
-zzzzz-p5p6p-zuniv58hn8d0qd8
-</code></pre>
-</notextile>
-
-h3. Running registered workflows at the command line
-
-You can run a registered workflow at the command line by its UUID:
-
-<notextile>
-<pre><code>~/arvados/doc/user/cwl/bwa-mem$ <span class="userinput">arvados-cwl-runner zzzzz-p5p6p-zuniv58hn8d0qd8 --help</span>
-/home/peter/work/scripts/venv/bin/arvados-cwl-runner 0d62edcb9d25bf4dcdb20d8872ea7b438e12fc59 1.0.20161209192028, arvados-python-client 0.1.20161212125425, cwltool 1.0.20161207161158
-Resolved 'zzzzz-p5p6p-zuniv58hn8d0qd8' to 'keep:655c6cd07550151b210961ed1d3852cf+57/bwa-mem.cwl'
-usage: zzzzz-p5p6p-zuniv58hn8d0qd8 [-h] [--PL PL] --group_id GROUP_ID
- --read_p1 READ_P1 [--read_p2 READ_P2]
- [--reference REFERENCE] --sample_id
- SAMPLE_ID
- [job_order]
-
-positional arguments:
- job_order Job input json file
-
-optional arguments:
- -h, --help show this help message and exit
- --PL PL
- --group_id GROUP_ID
- --read_p1 READ_P1 The reads, in fastq format.
- --read_p2 READ_P2 For mate paired reads, the second file (optional).
- --reference REFERENCE
- The index files produced by `bwa index`
- --sample_id SAMPLE_ID
-</code></pre>
-</notextile>
-
h2. Using cwltool
When developing a workflow, it is often helpful to run it on the local host to avoid the overhead of submitting to the cluster. To execute a workflow only on the local host (without submitting jobs to an Arvados cluster) you can use the @cwltool@ command. Note that when using @cwltool@ you must have the input data accessible on the local file system using either @arv-mount@ or @arv-get@ to fetch the data from Keep.
</notextile>
If you get the error @JavascriptException: Long-running script killed after 20 seconds.@ this may be due to the Dockerized Node.js engine taking too long to start. You may address this by installing Node.js locally (run @apt-get install nodejs@ on Debian or Ubuntu) or by specifying a longer timeout with the @--eval-timeout@ option. For example, run the workflow with @cwltool --eval-timeout=40@ for a 40-second timeout.
-
-h2. Making workflows directly executable
-
-You can make a workflow file directly executable (@cwl-runner@ should be an alias to @arvados-cwl-runner@) by adding the following line to the top of the file:
-
-<notextile>
-<pre><code>#!/usr/bin/env cwl-runner
-</code></pre>
-</notextile>
-
-<notextile>
-<pre><code>~/arvados/doc/user/cwl/bwa-mem$ <span class="userinput">./bwa-mem.cwl bwa-mem-input.yml</span>
-arvados-cwl-runner 1.0.20160628195002, arvados-python-client 0.1.20160616015107, cwltool 1.0.20160629140624
-2016-06-30 14:56:36 arvados.arv-run[27002] INFO: Upload local files: "bwa-mem.cwl"
-2016-06-30 14:56:36 arvados.arv-run[27002] INFO: Uploaded to zzzzz-4zz18-h7ljh5u76760ww2
-2016-06-30 14:56:40 arvados.cwl-runner[27002] INFO: Submitted job zzzzz-8i9sb-fm2n3b1w0l6bskg
-2016-06-30 14:56:41 arvados.cwl-runner[27002] INFO: Job bwa-mem.cwl (zzzzz-8i9sb-fm2n3b1w0l6bskg) is Running
-2016-06-30 14:57:12 arvados.cwl-runner[27002] INFO: Job bwa-mem.cwl (zzzzz-8i9sb-fm2n3b1w0l6bskg) is Complete
-2016-06-30 14:57:12 arvados.cwl-runner[27002] INFO: Overall process status is success
-{
- "aligned_sam": {
- "path": "keep:54325254b226664960de07b3b9482349+154/HWI-ST1027_129_D0THKACXX.1_1.sam",
- "checksum": "sha1$0dc46a3126d0b5d4ce213b5f0e86e2d05a54755a",
- "class": "File",
- "size": 30738986
- }
-}
-</code></pre>
-</notextile>
-
-You can even make an input file directly executable the same way with the following two lines at the top:
-
-<notextile>
-<pre><code>#!/usr/bin/env cwl-runner
-cwl:tool: <span class="userinput">bwa-mem.cwl</span>
-</code></pre>
-</notextile>
-
-<notextile>
-<pre><code>~/arvados/doc/user/cwl/bwa-mem$ <span class="userinput">./bwa-mem-input.yml</span>
-arvados-cwl-runner 1.0.20160628195002, arvados-python-client 0.1.20160616015107, cwltool 1.0.20160629140624
-2016-06-30 14:56:36 arvados.arv-run[27002] INFO: Upload local files: "bwa-mem.cwl"
-2016-06-30 14:56:36 arvados.arv-run[27002] INFO: Uploaded to zzzzz-4zz18-h7ljh5u76760ww2
-2016-06-30 14:56:40 arvados.cwl-runner[27002] INFO: Submitted job zzzzz-8i9sb-fm2n3b1w0l6bskg
-2016-06-30 14:56:41 arvados.cwl-runner[27002] INFO: Job bwa-mem.cwl (zzzzz-8i9sb-fm2n3b1w0l6bskg) is Running
-2016-06-30 14:57:12 arvados.cwl-runner[27002] INFO: Job bwa-mem.cwl (zzzzz-8i9sb-fm2n3b1w0l6bskg) is Complete
-2016-06-30 14:57:12 arvados.cwl-runner[27002] INFO: Overall process status is success
-{
- "aligned_sam": {
- "path": "keep:54325254b226664960de07b3b9482349+154/HWI-ST1027_129_D0THKACXX.1_1.sam",
- "checksum": "sha1$0dc46a3126d0b5d4ce213b5f0e86e2d05a54755a",
- "class": "File",
- "size": 30738986
- }
-}
-</code></pre>
-</notextile>
projects / arvados.git / blobdiff