From fb24f24134e2eba607bc15f77d02962fa2ce5fce Mon Sep 17 00:00:00 2001
From: Davide Albanese <davide.albanese@gmail.com>
Date: Thu, 14 May 2020 15:21:19 +0200
Subject: [PATCH 1/2] Add 'process when another process fails' pattern

---
 docs/index.adoc                              |   1 +
 docs/index.html                              | 688 ++++++++++++-------
 docs/process-when-another-process-fails.adoc | 104 +++
 process-when-another-process-fails.nf        |  54 ++
 process-when-another-process-fails2.nf       |  61 ++
 5 files changed, 649 insertions(+), 259 deletions(-)
 create mode 100644 docs/process-when-another-process-fails.adoc
 create mode 100644 process-when-another-process-fails.nf
 create mode 100644 process-when-another-process-fails2.nf
diff --git a/docs/index.adoc b/docs/index.adoc
index 23e12ce..6d2d984 100644
--- a/docs/index.adoc
+++ b/docs/index.adoc
@@ -60,5 +60,6 @@ include::feedback-loop.adoc[]
 include::optional-input.adoc[]
 include::optional-output.adoc[]
 include::process-when-empty.adoc[]
+include::process-when-another-process-fails.adoc[]
 :leveloffset: -2
 
diff --git a/docs/index.html b/docs/index.html
index 9c8c164..730e0d2 100644
--- a/docs/index.html
+++ b/docs/index.html
@@ -2,22 +2,24 @@
 <html lang="en">
 <head>
 <meta charset="UTF-8">
-<meta http-equiv="X-UA-Compatible" content="IE=edge">
+<!--[if IE]><meta http-equiv="X-UA-Compatible" content="IE=edge"><![endif]-->
 <meta name="viewport" content="width=device-width, initial-scale=1.0">
-<meta name="generator" content="Asciidoctor 2.0.10">
+<meta name="generator" content="Asciidoctor 1.5.5">
 <meta name="description" content="Nextflow implementation patterns.">
 <meta name="keywords" content="Nextflow, computational workflows, patterns">
 <title>Nextflow Patterns</title>
 <link rel="stylesheet" href="https://fonts.googleapis.com/css?family=Open+Sans:300,300italic,400,400italic,600,600italic%7CNoto+Serif:400,400italic,700,700italic%7CDroid+Sans+Mono:400,700">
 <style>
-/* Asciidoctor default stylesheet | MIT License | https://asciidoctor.org */
-/* Uncomment @import statement to use as custom stylesheet */
+/* Asciidoctor default stylesheet | MIT License | http://asciidoctor.org */
+/* Remove comment around @import statement below when using as a custom stylesheet */
 /*@import "https://fonts.googleapis.com/css?family=Open+Sans:300,300italic,400,400italic,600,600italic%7CNoto+Serif:400,400italic,700,700italic%7CDroid+Sans+Mono:400,700";*/
-article,aside,details,figcaption,figure,footer,header,hgroup,main,nav,section{display:block}
-audio,video{display:inline-block}
+article,aside,details,figcaption,figure,footer,header,hgroup,main,nav,section,summary{display:block}
+audio,canvas,video{display:inline-block}
 audio:not([controls]){display:none;height:0}
+[hidden],template{display:none}
+script{display:none!important}
 html{font-family:sans-serif;-ms-text-size-adjust:100%;-webkit-text-size-adjust:100%}
-a{background:none}
+a{background:transparent}
 a:focus{outline:thin dotted}
 a:active,a:hover{outline:0}
 h1{font-size:2em;margin:.67em 0}
@@ -44,10 +46,12 @@
 button,html input[type="button"],input[type="reset"],input[type="submit"]{-webkit-appearance:button;cursor:pointer}
 button[disabled],html input[disabled]{cursor:default}
 input[type="checkbox"],input[type="radio"]{box-sizing:border-box;padding:0}
+input[type="search"]{-webkit-appearance:textfield;-moz-box-sizing:content-box;-webkit-box-sizing:content-box;box-sizing:content-box}
+input[type="search"]::-webkit-search-cancel-button,input[type="search"]::-webkit-search-decoration{-webkit-appearance:none}
 button::-moz-focus-inner,input::-moz-focus-inner{border:0;padding:0}
 textarea{overflow:auto;vertical-align:top}
 table{border-collapse:collapse;border-spacing:0}
-*,*::before,*::after{-moz-box-sizing:border-box;-webkit-box-sizing:border-box;box-sizing:border-box}
+*,*:before,*:after{-moz-box-sizing:border-box;-webkit-box-sizing:border-box;box-sizing:border-box}
 html,body{font-size:100%}
 body{background:#fff;color:rgba(0,0,0,.8);padding:0;margin:0;font-family:"Noto Serif","DejaVu Serif",serif;font-weight:400;font-style:normal;line-height:1;position:relative;cursor:auto;tab-size:4;-moz-osx-font-smoothing:grayscale;-webkit-font-smoothing:antialiased}
 a:hover{cursor:pointer}
@@ -65,12 +69,13 @@
 textarea{height:auto;min-height:50px}
 select{width:100%}
 .center{margin-left:auto;margin-right:auto}
-.stretch{width:100%}
+.spread{width:100%}
+p.lead,.paragraph.lead>p,#preamble>.sectionbody>.paragraph:first-of-type p{font-size:1.21875em;line-height:1.6}
 .subheader,.admonitionblock td.content>.title,.audioblock>.title,.exampleblock>.title,.imageblock>.title,.listingblock>.title,.literalblock>.title,.stemblock>.title,.openblock>.title,.paragraph>.title,.quoteblock>.title,table.tableblock>.title,.verseblock>.title,.videoblock>.title,.dlist>.title,.olist>.title,.ulist>.title,.qlist>.title,.hdlist>.title{line-height:1.45;color:#7a2518;font-weight:400;margin-top:0;margin-bottom:.25em}
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 a{color:#2156a5;text-decoration:underline;line-height:inherit}
 a:hover,a:focus{color:#1d4b8f}
-a img{border:0}
+a img{border:none}
 p{font-family:inherit;font-weight:400;font-size:1em;line-height:1.6;margin-bottom:1.25em;text-rendering:optimizeLegibility}
 p aside{font-size:.875em;line-height:1.35;font-style:italic}
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@@ -80,18 +85,19 @@
 h3,#toctitle,.sidebarblock>.content>.title{font-size:1.375em}
 h4,h5{font-size:1.125em}
 h6{font-size:1em}
-hr{border:solid #dddddf;border-width:1px 0 0;clear:both;margin:1.25em 0 1.1875em;height:0}
+hr{border:solid #ddddd8;border-width:1px 0 0;clear:both;margin:1.25em 0 1.1875em;height:0}
 em,i{font-style:italic;line-height:inherit}
 strong,b{font-weight:bold;line-height:inherit}
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 code{font-family:"Droid Sans Mono","DejaVu Sans Mono",monospace;font-weight:400;color:rgba(0,0,0,.9)}
 ul,ol,dl{font-size:1em;line-height:1.6;margin-bottom:1.25em;list-style-position:outside;font-family:inherit}
-ul,ol{margin-left:1.5em}
+ul,ol,ul.no-bullet,ol.no-bullet{margin-left:1.5em}
 ul li ul,ul li ol{margin-left:1.25em;margin-bottom:0;font-size:1em}
 ul.square li ul,ul.circle li ul,ul.disc li ul{list-style:inherit}
 ul.square{list-style-type:square}
 ul.circle{list-style-type:circle}
 ul.disc{list-style-type:disc}
+ul.no-bullet{list-style:none}
 ol li ul,ol li ol{margin-left:1.25em;margin-bottom:0}
 dl dt{margin-bottom:.3125em;font-weight:bold}
 dl dd{margin-bottom:1.25em}
@@ -99,65 +105,58 @@
 abbr{text-transform:none}
 blockquote{margin:0 0 1.25em;padding:.5625em 1.25em 0 1.1875em;border-left:1px solid #ddd}
 blockquote cite{display:block;font-size:.9375em;color:rgba(0,0,0,.6)}
-blockquote cite::before{content:"\2014 \0020"}
+blockquote cite:before{content:"\2014 \0020"}
 blockquote cite a,blockquote cite a:visited{color:rgba(0,0,0,.6)}
 blockquote,blockquote p{line-height:1.6;color:rgba(0,0,0,.85)}
-@media screen and (min-width:768px){h1,h2,h3,#toctitle,.sidebarblock>.content>.title,h4,h5,h6{line-height:1.2}
+@media only screen and (min-width:768px){h1,h2,h3,#toctitle,.sidebarblock>.content>.title,h4,h5,h6{line-height:1.2}
 h1{font-size:2.75em}
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 h4{font-size:1.4375em}}
 table{background:#fff;margin-bottom:1.25em;border:solid 1px #dedede}
-table thead,table tfoot{background:#f7f8f7}
+table thead,table tfoot{background:#f7f8f7;font-weight:bold}
 table thead tr th,table thead tr td,table tfoot tr th,table tfoot tr td{padding:.5em .625em .625em;font-size:inherit;color:rgba(0,0,0,.8);text-align:left}
 table tr th,table tr td{padding:.5625em .625em;font-size:inherit;color:rgba(0,0,0,.8)}
-table tr.even,table tr.alt{background:#f8f8f7}
+table tr.even,table tr.alt,table tr:nth-of-type(even){background:#f8f8f7}
 table thead tr th,table tfoot tr th,table tbody tr td,table tr td,table tfoot tr td{display:table-cell;line-height:1.6}
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-:not(pre)>code.nobreak{word-wrap:normal}
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-pre{color:rgba(0,0,0,.9);font-family:"Droid Sans Mono","DejaVu Sans Mono",monospace;line-height:1.45;text-rendering:optimizeSpeed}
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+kbd{font-family:"Droid Sans Mono","DejaVu Sans Mono",monospace;display:inline-block;color:rgba(0,0,0,.8);font-size:.65em;line-height:1.45;background-color:#f7f7f7;border:1px solid #ccc;-webkit-border-radius:3px;border-radius:3px;-webkit-box-shadow:0 1px 0 rgba(0,0,0,.2),0 0 0 .1em white inset;box-shadow:0 1px 0 rgba(0,0,0,.2),0 0 0 .1em #fff inset;margin:0 .15em;padding:.2em .5em;vertical-align:middle;position:relative;top:-.1em;white-space:nowrap}
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+#header>h1:first-child+#toc{margin-top:8px;border-top:1px solid #ddddd8}
+#header>h1:only-child,body.toc2 #header>h1:nth-last-child(2){border-bottom:1px solid #ddddd8;padding-bottom:8px}
+#header .details{border-bottom:1px solid #ddddd8;line-height:1.45;padding-top:.25em;padding-bottom:.25em;padding-left:.25em;color:rgba(0,0,0,.6);display:-ms-flexbox;display:-webkit-flex;display:flex;-ms-flex-flow:row wrap;-webkit-flex-flow:row wrap;flex-flow:row wrap}
 #header .details span:first-child{margin-left:-.125em}
 #header .details span.email a{color:rgba(0,0,0,.85)}
 #header .details br{display:none}
-#header .details br+span::before{content:"\00a0\2013\00a0"}
-#header .details br+span.author::before{content:"\00a0\22c5\00a0";color:rgba(0,0,0,.85)}
-#header .details br+span#revremark::before{content:"\00a0|\00a0"}
+#header .details br+span:before{content:"\00a0\2013\00a0"}
+#header .details br+span.author:before{content:"\00a0\22c5\00a0";color:rgba(0,0,0,.85)}
+#header .details br+span#revremark:before{content:"\00a0|\00a0"}
 #header #revnumber{text-transform:capitalize}
-#header #revnumber::after{content:"\00a0"}
-#content>h1:first-child:not([class]){color:rgba(0,0,0,.85);border-bottom:1px solid #dddddf;padding-bottom:8px;margin-top:0;padding-top:1rem;margin-bottom:1.25rem}
-#toc{border-bottom:1px solid #e7e7e9;padding-bottom:.5em}
+#header #revnumber:after{content:"\00a0"}
+#content>h1:first-child:not([class]){color:rgba(0,0,0,.85);border-bottom:1px solid #ddddd8;padding-bottom:8px;margin-top:0;padding-top:1rem;margin-bottom:1.25rem}
+#toc{border-bottom:1px solid #efefed;padding-bottom:.5em}
 #toc>ul{margin-left:.125em}
 #toc ul.sectlevel0>li>a{font-style:italic}
 #toc ul.sectlevel0 ul.sectlevel1{margin:.5em 0}
@@ -166,16 +165,16 @@
 #toc a{text-decoration:none}
 #toc a:active{text-decoration:underline}
 #toctitle{color:#7a2518;font-size:1.2em}
-@media screen and (min-width:768px){#toctitle{font-size:1.375em}
+@media only screen and (min-width:768px){#toctitle{font-size:1.375em}
 body.toc2{padding-left:15em;padding-right:0}
-#toc.toc2{margin-top:0!important;background:#f8f8f7;position:fixed;width:15em;left:0;top:0;border-right:1px solid #e7e7e9;border-top-width:0!important;border-bottom-width:0!important;z-index:1000;padding:1.25em 1em;height:100%;overflow:auto}
+#toc.toc2{margin-top:0!important;background-color:#f8f8f7;position:fixed;width:15em;left:0;top:0;border-right:1px solid #efefed;border-top-width:0!important;border-bottom-width:0!important;z-index:1000;padding:1.25em 1em;height:100%;overflow:auto}
 #toc.toc2 #toctitle{margin-top:0;margin-bottom:.8rem;font-size:1.2em}
 #toc.toc2>ul{font-size:.9em;margin-bottom:0}
 #toc.toc2 ul ul{margin-left:0;padding-left:1em}
 #toc.toc2 ul.sectlevel0 ul.sectlevel1{padding-left:0;margin-top:.5em;margin-bottom:.5em}
 body.toc2.toc-right{padding-left:0;padding-right:15em}
-body.toc2.toc-right #toc.toc2{border-right-width:0;border-left:1px solid #e7e7e9;left:auto;right:0}}
-@media screen and (min-width:1280px){body.toc2{padding-left:20em;padding-right:0}
+body.toc2.toc-right #toc.toc2{border-right-width:0;border-left:1px solid #efefed;left:auto;right:0}}
+@media only screen and (min-width:1280px){body.toc2{padding-left:20em;padding-right:0}
 #toc.toc2{width:20em}
 #toc.toc2 #toctitle{font-size:1.375em}
 #toc.toc2>ul{font-size:.95em}
@@ -184,101 +183,89 @@
 #content #toc{border-style:solid;border-width:1px;border-color:#e0e0dc;margin-bottom:1.25em;padding:1.25em;background:#f8f8f7;-webkit-border-radius:4px;border-radius:4px}
 #content #toc>:first-child{margin-top:0}
 #content #toc>:last-child{margin-bottom:0}
-#footer{max-width:100%;background:rgba(0,0,0,.8);padding:1.25em}
+#footer{max-width:100%;background-color:rgba(0,0,0,.8);padding:1.25em}
 #footer-text{color:rgba(255,255,255,.8);line-height:1.44}
-#content{margin-bottom:.625em}
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-.sect1{padding-bottom:1.25em}}
-.sect1:last-child{padding-bottom:0}
-.sect1+.sect1{border-top:1px solid #e7e7e9}
+@media only screen and (min-width:768px){.sect1{padding-bottom:1.25em}}
+.sect1+.sect1{border-top:1px solid #efefed}
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+#content h1>a.anchor:before,h2>a.anchor:before,h3>a.anchor:before,#toctitle>a.anchor:before,.sidebarblock>.content>.title>a.anchor:before,h4>a.anchor:before,h5>a.anchor:before,h6>a.anchor:before{content:"\00A7";font-size:.85em;display:block;padding-top:.1em}
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+table.tableblock>caption.title{white-space:nowrap;overflow:visible;max-width:0}
+.paragraph.lead>p,#preamble>.sectionbody>.paragraph:first-of-type p{color:rgba(0,0,0,.85)}
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 <style>
 table.CodeRay { display: block; overflow-x: auto; }
@@ -446,7 +519,7 @@
 </head>
 <body class="article toc2 toc-left">
 <div id="header">
-<h1>Nextflow Patterns <span class="image right Nextflow Logo"><img src="https://www.nextflow.io/img/nextflow2014_no-bg.png" alt="Logo" width="300" height="100"></span></h1>
+<h1>Nextflow Patterns <span class="image Nextflow Logo" style="float: right"><img src="https://www.nextflow.io/img/nextflow2014_no-bg.png" alt="Logo" width="300" height="100"></span></h1>
 <div id="toc" class="toc2">
 <div id="toctitle">Table of Contents</div>
 <ul class="sectlevel1">
@@ -495,6 +568,7 @@ <h1>Nextflow Patterns <span class="image right Nextflow Logo"><img src="https://
 <li><a href="#_optional_input">6.5. Optional input</a></li>
 <li><a href="#_optional_output">6.6. Optional output</a></li>
 <li><a href="#_execute_when_empty">6.7. Execute when empty</a></li>
+<li><a href="#_execute_when_another_process_fails">6.8. Execute when another process fails</a></li>
 </ul>
 </li>
 </ul>
@@ -918,7 +992,7 @@ <h4 id="_code_6"><a class="link" href="#_code_6">2.5.3. Code</a></h4>
 <div class="paragraph">
 <p>Given the file <code>index.csv</code> with the following content:</p>
 </div>
-<table class="tableblock frame-all grid-all stretch">
+<table class="tableblock frame-all grid-all spread">
 <colgroup>
 <col style="width: 33.3333%;">
 <col style="width: 33.3333%;">
@@ -2597,98 +2671,194 @@ <h4 id="_run_it_26"><a class="link" href="#_run_it_26">6.7.4. Run it</a></h4>
 </div>
 </div>
 </div>
+<div class="sect2">
+<h3 id="_execute_when_another_process_fails"><a class="link" href="#_execute_when_another_process_fails">6.8. Execute when another process fails</a></h3>
+<div class="sect3">
+<h4 id="_problem_24"><a class="link" href="#_problem_24">6.8.1. Problem</a></h4>
+<div class="paragraph">
+<p>You need to execute a process if another process fails.</p>
+</div>
+</div>
+<div class="sect3">
+<h4 id="_solution_24"><a class="link" href="#_solution_24">6.8.2. Solution</a></h4>
+<div class="paragraph">
+<p>Use the <a href="https://www.nextflow.io/docs/latest/process.html#output-env">env</a> qualifier
+to capture the exit status of the process. <code>set +e</code> prevents the script from exiting
+immediately if the command exits with a non-zero status.</p>
+</div>
+</div>
+<div class="sect3">
+<h4 id="_example_3"><a class="link" href="#_example_3">6.8.3. Example</a></h4>
+<div class="listingblock">
+<div class="content">
+<pre class="CodeRay highlight nowrap"><code data-lang="nextflow"><table class="CodeRay"><tr>
+  <td class="line-numbers"><pre>1
+2
+3
+4
+5
+6
+7
+8
+9
+10
+11
+12
+13
+14
+15
+16
+17
+18
+19
+20
+21
+22
+23
+24
+25
+26
+</pre></td>
+  <td class="code"><pre>process foo {
+
+  output:
+  env PROCESS_FOO_FAILED into process_foo_failed
+
+  script:
+  &quot;&quot;&quot;
+  set +e
+  PROCESS_FOO_FAILED=0
+  trap 'PROCESS_FOO_FAILED=1' ERR
+  cat thisfiledoesnotexist.txt
+  &quot;&quot;&quot;
+}
+
+process bar {
+  input:
+  val x from process_foo_failed
+
+  when:
+  x==&quot;1&quot;
+
+  script:
+  &quot;&quot;&quot;
+  echo $x
+  &quot;&quot;&quot;
+}</pre></td>
+</tr></table></code></pre>
+</div>
+</div>
+</div>
+<div class="sect3">
+<h4 id="_run_it_27"><a class="link" href="#_run_it_27">6.8.4. Run it</a></h4>
+<div class="paragraph">
+<p>Use the the following command to execute the example:</p>
+</div>
+<div class="listingblock">
+<div class="content">
+<pre class="CodeRay highlight"><code>nextflow run patterns/process-when-another-process-fails.nf</code></pre>
+</div>
+</div>
+</div>
+<div class="sect3">
+<h4 id="_dynamic_computing_resources"><a class="link" href="#_dynamic_computing_resources">6.8.5. Dynamic computing resources</a></h4>
+<div class="paragraph">
+<p>Use <code>set +e</code> only for the last task attempt if the process <code>foo</code> implements
+dynamic directives to control the computing resources requested in case of
+a process failure.</p>
+</div>
+</div>
+<div class="sect3">
+<h4 id="_code_23"><a class="link" href="#_code_23">6.8.6. Code</a></h4>
+<div class="listingblock">
+<div class="content">
+<pre class="CodeRay highlight nowrap"><code data-lang="nextflow"><table class="CodeRay"><tr>
+  <td class="line-numbers"><pre>1
+2
+3
+4
+5
+6
+7
+8
+9
+10
+11
+12
+13
+14
+15
+16
+17
+18
+19
+20
+21
+22
+23
+24
+25
+26
+27
+28
+29
+30
+31
+32
+33
+</pre></td>
+  <td class="code"><pre>process foo {
+
+  memory { 1.GB * task.attempt }
+  maxRetries 2
+  errorStrategy 'retry'
+
+  output:
+  env PROCESS_FOO_FAILED into process_foo_failed
+
+  script:
+  &quot;&quot;&quot;
+  if [ ${task.attempt} = ${task.maxRetries + 1 } ]; then
+    set +e
+  fi
+
+  PROCESS_FOO_FAILED=0
+  trap 'PROCESS_FOO_FAILED=1' ERR
+  cat thisfiledoesnotexist.txt
+  &quot;&quot;&quot;
+}
+
+process bar {
+  input:
+  val x from process_foo_failed
+
+  when:
+  x==&quot;1&quot;
+
+  script:
+  &quot;&quot;&quot;
+  echo $x
+  &quot;&quot;&quot;
+}</pre></td>
+</tr></table></code></pre>
+</div>
+</div>
+</div>
+<div class="sect3">
+<h4 id="_run_it_28"><a class="link" href="#_run_it_28">6.8.7. Run it</a></h4>
+<div class="paragraph">
+<p>Use the the following command to execute the example:</p>
+</div>
+<div class="listingblock">
+<div class="content">
+<pre class="CodeRay highlight"><code>nextflow run patterns/process-when-another-process-fails2.nf</code></pre>
+</div>
+</div>
+</div>
+</div>
 </div>
 </div>
 </div>
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diff --git a/docs/process-when-another-process-fails.adoc b/docs/process-when-another-process-fails.adoc
new file mode 100644
index 0000000..c500d35
--- /dev/null
+++ b/docs/process-when-another-process-fails.adoc
@@ -0,0 +1,104 @@
+= Execute when another process fails 
+
+== Problem 
+
+You need to execute a process if another process fails. 
+
+== Solution 
+
+Use the https://www.nextflow.io/docs/latest/process.html#output-env[env] qualifier
+to capture the exit status of the process. `set +e` prevents the script from exiting
+immediately if the command exits with a non-zero status.
+
+== Example 
+
+[source,nextflow,linenums,options="nowrap"]
+----
+process foo {
+
+  output:
+  env PROCESS_FOO_FAILED into process_foo_failed
+  
+  script:
+  """
+  set +e
+  PROCESS_FOO_FAILED=0
+  trap 'PROCESS_FOO_FAILED=1' ERR
+  cat thisfiledoesnotexist.txt
+  """
+}  
+
+process bar {
+  input: 
+  val x from process_foo_failed
+  
+  when:
+  x=="1"
+
+  script:
+  """
+  echo $x
+  """
+}
+----
+
+== Run it 
+
+Use the the following command to execute the example:
+
+```
+nextflow run patterns/process-when-another-process-fails.nf
+```
+
+== Dynamic computing resources
+
+Use `set +e` only for the last task attempt if the process `foo` implements
+dynamic directives to control the computing resources requested in case of 
+a process failure.
+
+== Code 
+
+[source,nextflow,linenums,options="nowrap"]
+----
+process foo {
+
+  memory { 1.GB * task.attempt }
+  maxRetries 2
+  errorStrategy 'retry'
+
+  output:
+  env PROCESS_FOO_FAILED into process_foo_failed
+  
+  script:
+  """
+  if [ ${task.attempt} = ${task.maxRetries + 1 } ]; then
+    set +e
+  fi
+
+  PROCESS_FOO_FAILED=0
+  trap 'PROCESS_FOO_FAILED=1' ERR
+  cat thisfiledoesnotexist.txt
+  """
+}  
+
+process bar {
+  input: 
+  val x from process_foo_failed
+  
+  when:
+  x=="1"
+
+  script:
+  """
+  echo $x
+  """
+}
+----
+
+== Run it 
+
+Use the the following command to execute the example:
+
+```
+nextflow run patterns/process-when-another-process-fails2.nf
+```
\ No newline at end of file
diff --git a/process-when-another-process-fails.nf b/process-when-another-process-fails.nf
new file mode 100644
index 0000000..f963d94
--- /dev/null
+++ b/process-when-another-process-fails.nf
@@ -0,0 +1,54 @@
+#!/usr/bin/env nextflow
+
+/*
+ * Copyright (c) 2020, Centre for Genomic Regulation (CRG).
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ * 
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ * 
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+
+ /*
+  * author Davide Albanese <davide.albanese@gmail.com> 
+  */
+
+process foo {
+
+  output:
+  env PROCESS_FOO_FAILED into process_foo_failed
+  
+  script:
+  """
+  set +e
+  PROCESS_FOO_FAILED=0
+  trap 'PROCESS_FOO_FAILED=1' ERR
+  cat thisfiledoesnotexist.txt
+  """
+}  
+
+process bar {
+  input: 
+  val x from process_foo_failed
+  
+  when:
+  x=="1"
+
+  script:
+  """
+  echo $x
+  """
+}
diff --git a/process-when-another-process-fails2.nf b/process-when-another-process-fails2.nf
new file mode 100644
index 0000000..3735f13
--- /dev/null
+++ b/process-when-another-process-fails2.nf
@@ -0,0 +1,61 @@
+#!/usr/bin/env nextflow
+
+/*
+ * Copyright (c) 2020, Centre for Genomic Regulation (CRG).
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ * 
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ * 
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+
+ /*
+  * author Davide Albanese <davide.albanese@gmail.com> 
+  */
+
+process foo {
+
+  memory { 1.GB * task.attempt }
+  maxRetries 2
+  errorStrategy 'retry'
+
+  output:
+  env PROCESS_FOO_FAILED into process_foo_failed
+  
+  script:
+  """
+  if [ ${task.attempt} = ${task.maxRetries + 1 } ]; then
+    set +e
+  fi
+
+  PROCESS_FOO_FAILED=0
+  trap 'PROCESS_FOO_FAILED=1' ERR
+  cat thisfiledoesnotexist.txt
+  """
+}  
+
+process bar {
+  input: 
+  val x from process_foo_failed
+  
+  when:
+  x=="1"
+
+  script:
+  """
+  echo $x
+  """
+}

From 9754c77c15ce2d54d04ae1bce7a766bf6eeeb232 Mon Sep 17 00:00:00 2001
From: Davide Albanese <davide.albanese@gmail.com>
Date: Thu, 14 May 2020 15:23:04 +0200
Subject: [PATCH 2/2] Update the README

---
 README.md | 1 +
 1 file changed, 1 insertion(+)

diff --git a/README.md b/README.md
index 8e9d6ab..27ab954 100644
--- a/README.md
+++ b/README.md
@@ -42,3 +42,4 @@ A curated collections of Nextflow implementation patterns
 * [Optional input](docs/optional-input.adoc)
 * [Optional output](docs/optional-output.adoc)
 * [Process when empty](docs/process-when-empty.adoc)
+* [Process when another process fails](docs/process-when-another-process-fails.adoc)
\ No newline at end of file
