4 title: "Writing a CWL workflow"
7 {% include 'what_is_cwl' %}
9 {% include 'tutorial_expectations' %}
11 h2. Developing workflows
13 For an introduction and and detailed documentation about writing CWL, see the "CWL User Guide":http://commonwl.org/v1.0/UserGuide.html and the "CWL Specification":http://commonwl.org/v1.0 .
15 To run on Arvados, a workflow should provide a @DockerRequirement@ in the @hints@ section.
17 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 you must also have the input data accessible on the local host. You can use @arv-get@ to fetch the data from Keep.
20 <pre><code>~/arvados/doc/user/cwl/bwa-mem$ <span class="userinput">arv-get 2463fa9efeb75e099685528b3b9071e0+438/ .</span>
21 156 MiB / 156 MiB 100.0%
22 ~/arvados/doc/user/cwl/bwa-mem$ <span class="userinput">arv-get ae480c5099b81e17267b7445e35b4bc7+180/ .</span>
23 23 MiB / 23 MiB 100.0%
24 ~/arvados/doc/user/cwl/bwa-mem$ <span class="userinput">cwltool bwa-mem-input.yml bwa-mem-input-local.yml</span>
25 cwltool 1.0.20160629140624
26 [job bwa-mem.cwl] /home/example/arvados/doc/user/cwl/bwa-mem$ docker \
29 --volume=/home/example/arvados/doc/user/cwl/bwa-mem/19.fasta.ann:/var/lib/cwl/job979368791_bwa-mem/19.fasta.ann:ro \
30 --volume=/home/example/arvados/doc/user/cwl/bwa-mem/HWI-ST1027_129_D0THKACXX.1_1.fastq:/var/lib/cwl/job979368791_bwa-mem/HWI-ST1027_129_D0THKACXX.1_1.fastq:ro \
31 --volume=/home/example/arvados/doc/user/cwl/bwa-mem/19.fasta.sa:/var/lib/cwl/job979368791_bwa-mem/19.fasta.sa:ro \
32 --volume=/home/example/arvados/doc/user/cwl/bwa-mem/19.fasta.amb:/var/lib/cwl/job979368791_bwa-mem/19.fasta.amb:ro \
33 --volume=/home/example/arvados/doc/user/cwl/bwa-mem/19.fasta.pac:/var/lib/cwl/job979368791_bwa-mem/19.fasta.pac:ro \
34 --volume=/home/example/arvados/doc/user/cwl/bwa-mem/HWI-ST1027_129_D0THKACXX.1_2.fastq:/var/lib/cwl/job979368791_bwa-mem/HWI-ST1027_129_D0THKACXX.1_2.fastq:ro \
35 --volume=/home/example/arvados/doc/user/cwl/bwa-mem/19.fasta.bwt:/var/lib/cwl/job979368791_bwa-mem/19.fasta.bwt:ro \
36 --volume=/home/example/arvados/doc/user/cwl/bwa-mem:/var/spool/cwl:rw \
37 --volume=/tmp/tmpgzyou9:/tmp:rw \
38 --workdir=/var/spool/cwl \
44 --env=HOME=/var/spool/cwl \
51 '@RG ID:arvados_tutorial PL:illumina SM:HWI-ST1027_129' \
52 /var/lib/cwl/job979368791_bwa-mem/19.fasta \
53 /var/lib/cwl/job979368791_bwa-mem/HWI-ST1027_129_D0THKACXX.1_1.fastq \
54 /var/lib/cwl/job979368791_bwa-mem/HWI-ST1027_129_D0THKACXX.1_2.fastq > /home/example/arvados/doc/user/cwl/bwa-mem/HWI-ST1027_129_D0THKACXX.1_1.sam
55 [M::bwa_idx_load_from_disk] read 0 ALT contigs
56 [M::process] read 100000 sequences (10000000 bp)...
57 [M::mem_pestat] # candidate unique pairs for (FF, FR, RF, RR): (0, 4745, 1, 0)
58 [M::mem_pestat] skip orientation FF as there are not enough pairs
59 [M::mem_pestat] analyzing insert size distribution for orientation FR...
60 [M::mem_pestat] (25, 50, 75) percentile: (154, 181, 214)
61 [M::mem_pestat] low and high boundaries for computing mean and std.dev: (34, 334)
62 [M::mem_pestat] mean and std.dev: (185.63, 44.88)
63 [M::mem_pestat] low and high boundaries for proper pairs: (1, 394)
64 [M::mem_pestat] skip orientation RF as there are not enough pairs
65 [M::mem_pestat] skip orientation RR as there are not enough pairs
66 [M::mem_process_seqs] Processed 100000 reads in 9.848 CPU sec, 9.864 real sec
67 [main] Version: 0.7.12-r1039
68 [main] CMD: bwa mem -t 1 -R @RG ID:arvados_tutorial PL:illumina SM:HWI-ST1027_129 /var/lib/cwl/job979368791_bwa-mem/19.fasta /var/lib/cwl/job979368791_bwa-mem/HWI-ST1027_129_D0THKACXX.1_1.fastq /var/lib/cwl/job979368791_bwa-mem/HWI-ST1027_129_D0THKACXX.1_2.fastq
69 [main] Real time: 10.061 sec; CPU: 10.032 sec
70 Final process status is success
74 "path": "/home/example/arvados/doc/user/cwl/bwa-mem/HWI-ST1027_129_D0THKACXX.1_1.sam",
75 "checksum": "sha1$0c668cca45fef02397bb5302880526d300ee4dac",
82 If you get the error @JavascriptException: Long-running script killed after 20 seconds.@ this may be due to the Dockerized Node.js engine taking too long to start. You may address this by installing Node.js locally (run @apt-get install nodejs@ on Debian or Ubuntu) or by specifying a longer timeout with the @--eval-timeout@ option. For example, run the workflow with @cwltool --eval-timeout=40@ for a 40-second timeout.
84 h2. Registering a workflow to use in Workbench
86 Use @--create-workflow@ to register a CWL workflow with Arvados. This enables you to share workflows with other Arvados users, and run them by clicking the <span class="btn btn-sm btn-primary"><i class="fa fa-fw fa-gear"></i> Run a process...</span> button on the Workbench Dashboard.
89 <pre><code>~/arvados/doc/user/cwl/bwa-mem$ <span class="userinput">arvados-cwl-runner --create-workflow bwa-mem.cwl</span>
90 arvados-cwl-runner 1.0.20160628195002, arvados-python-client 0.1.20160616015107, cwltool 1.0.20160629140624
91 2016-07-01 12:21:01 arvados.arv-run[15796] INFO: Upload local files: "bwa-mem.cwl"
92 2016-07-01 12:21:01 arvados.arv-run[15796] INFO: Uploaded to qr1hi-4zz18-7e0hedrmkuyoei3
93 2016-07-01 12:21:01 arvados.cwl-runner[15796] INFO: Created template qr1hi-p5p6p-rjleou1dwr167v5
94 qr1hi-p5p6p-rjleou1dwr167v5
98 You can provide a partial input file to set default values for the workflow input parameters:
101 <pre><code>~/arvados/doc/user/cwl/bwa-mem$ <span class="userinput">arvados-cwl-runner --create-workflow bwa-mem.cwl bwa-mem-template.yml</span>
102 arvados-cwl-runner 1.0.20160628195002, arvados-python-client 0.1.20160616015107, cwltool 1.0.20160629140624
103 2016-07-01 14:09:50 arvados.arv-run[3730] INFO: Upload local files: "bwa-mem.cwl"
104 2016-07-01 14:09:50 arvados.arv-run[3730] INFO: Uploaded to qr1hi-4zz18-0f91qkovk4ml18o
105 2016-07-01 14:09:50 arvados.cwl-runner[3730] INFO: Created template qr1hi-p5p6p-0deqe6nuuyqns2i
106 qr1hi-p5p6p-0deqe6nuuyqns2i
110 h2. Running registered workflows at the command line
112 You can run a registered workflow at the command line by its UUID:
115 <pre><code>~/arvados/doc/user/cwl/bwa-mem$ <span class="userinput">arvados-cwl-runner 962eh-7fd4e-660fw86nz0w77mk bwa-mem-input.yml</span>
119 h2. Making workflows directly executable
121 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:
124 <pre><code>#!/usr/bin/env cwl-runner
129 <pre><code>~/arvados/doc/user/cwl/bwa-mem$ <span class="userinput">./bwa-mem.cwl bwa-mem-input.yml</span>
130 arvados-cwl-runner 1.0.20160628195002, arvados-python-client 0.1.20160616015107, cwltool 1.0.20160629140624
131 2016-06-30 14:56:36 arvados.arv-run[27002] INFO: Upload local files: "bwa-mem.cwl"
132 2016-06-30 14:56:36 arvados.arv-run[27002] INFO: Uploaded to qr1hi-4zz18-h7ljh5u76760ww2
133 2016-06-30 14:56:40 arvados.cwl-runner[27002] INFO: Submitted job qr1hi-8i9sb-fm2n3b1w0l6bskg
134 2016-06-30 14:56:41 arvados.cwl-runner[27002] INFO: Job bwa-mem.cwl (qr1hi-8i9sb-fm2n3b1w0l6bskg) is Running
135 2016-06-30 14:57:12 arvados.cwl-runner[27002] INFO: Job bwa-mem.cwl (qr1hi-8i9sb-fm2n3b1w0l6bskg) is Complete
136 2016-06-30 14:57:12 arvados.cwl-runner[27002] INFO: Overall process status is success
139 "path": "keep:54325254b226664960de07b3b9482349+154/HWI-ST1027_129_D0THKACXX.1_1.sam",
140 "checksum": "sha1$0dc46a3126d0b5d4ce213b5f0e86e2d05a54755a",
148 You can even make an input file directly executable the same way with the following two lines at the top:
151 <pre><code>#!/usr/bin/env cwl-runner
152 cwl:tool: <span class="userinput">bwa-mem.cwl</span>
157 <pre><code>~/arvados/doc/user/cwl/bwa-mem$ <span class="userinput">./bwa-mem-input.yml</span>
158 arvados-cwl-runner 1.0.20160628195002, arvados-python-client 0.1.20160616015107, cwltool 1.0.20160629140624
159 2016-06-30 14:56:36 arvados.arv-run[27002] INFO: Upload local files: "bwa-mem.cwl"
160 2016-06-30 14:56:36 arvados.arv-run[27002] INFO: Uploaded to qr1hi-4zz18-h7ljh5u76760ww2
161 2016-06-30 14:56:40 arvados.cwl-runner[27002] INFO: Submitted job qr1hi-8i9sb-fm2n3b1w0l6bskg
162 2016-06-30 14:56:41 arvados.cwl-runner[27002] INFO: Job bwa-mem.cwl (qr1hi-8i9sb-fm2n3b1w0l6bskg) is Running
163 2016-06-30 14:57:12 arvados.cwl-runner[27002] INFO: Job bwa-mem.cwl (qr1hi-8i9sb-fm2n3b1w0l6bskg) is Complete
164 2016-06-30 14:57:12 arvados.cwl-runner[27002] INFO: Overall process status is success
167 "path": "keep:54325254b226664960de07b3b9482349+154/HWI-ST1027_129_D0THKACXX.1_1.sam",
168 "checksum": "sha1$0dc46a3126d0b5d4ce213b5f0e86e2d05a54755a",
176 h3. Control a workflow locally
178 To run a workflow with local control, use @--local@. This means that the host where you run @arvados-cwl-runner@ will be responsible for submitting jobs, however, the jobs themselves will still run on the Arvados cluster. With @--local@, if you interrupt @arvados-cwl-runner@ or log out, the workflow will be terminated.
181 <pre><code>~/arvados/doc/user/cwl/bwa-mem$ <span class="userinput">arvados-cwl-runner --local bwa-mem.cwl bwa-mem-input.yml</span>
182 arvados-cwl-runner 1.0.20160628195002, arvados-python-client 0.1.20160616015107, cwltool 1.0.20160629140624
183 2016-07-01 10:05:19 arvados.cwl-runner[16290] INFO: Pipeline instance qr1hi-d1hrv-92wcu6ldtio74r4
184 2016-07-01 10:05:28 arvados.cwl-runner[16290] INFO: Job bwa-mem.cwl (qr1hi-8i9sb-2nzzfbuf9zjrj4g) is Queued
185 2016-07-01 10:05:29 arvados.cwl-runner[16290] INFO: Job bwa-mem.cwl (qr1hi-8i9sb-2nzzfbuf9zjrj4g) is Running
186 2016-07-01 10:05:45 arvados.cwl-runner[16290] INFO: Job bwa-mem.cwl (qr1hi-8i9sb-2nzzfbuf9zjrj4g) is Complete
187 2016-07-01 10:05:46 arvados.cwl-runner[16290] INFO: Overall process status is success
191 "path": "keep:15f56bad0aaa7364819bf14ca2a27c63+88/HWI-ST1027_129_D0THKACXX.1_1.sam",
192 "checksum": "sha1$0dc46a3126d0b5d4ce213b5f0e86e2d05a54755a",