doc

Author: Barthelemy

doc/Advanced.md

@@ -5,6 +5,7 @@ Advanced topics
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+   * [Advanced topics](#advanced-topics)
 * [Framework](#framework)
    * [Plugging the QC to an existing DPL workflow](#plugging-the-qc-to-an-existing-dpl-workflow)
    * [Production of QC objects outside this framework](#production-of-qc-objects-outside-this-framework)
@@ -18,6 +19,7 @@ Advanced topics
    * [Monitor cycles](#monitor-cycles)
    * [Writing a DPL data producer](#writing-a-dpl-data-producer)
    * [Custom merging](#custom-merging)
+   * [Critical and non-critical tasks](#critical-and-non-critical-tasks)
    * [QC with DPL Analysis](#qc-with-dpl-analysis)
       * [Uploading objects to QCDB](#uploading-objects-to-qcdb)
       * [Getting AODs in QC Tasks](#getting-aods-in-qc-tasks)
@@ -27,10 +29,11 @@ Advanced topics
 * [CCDB / QCDB](#ccdb--qcdb)
    * [Accessing objects in CCDB](#accessing-objects-in-ccdb)
    * [Access GRP objects with GRP Geom Helper](#access-grp-objects-with-grp-geom-helper)
+   * [Global Tracking Data Request helper](#global-tracking-data-request-helper)
    * [Custom metadata](#custom-metadata)
    * [Details on the data storage format in the CCDB](#details-on-the-data-storage-format-in-the-ccdb)
-      * [Data storage format before v0.14 and ROOT 6.18](#data-storage-format-before-v014-and-root-618)
    * [Local CCDB setup](#local-ccdb-setup)
+   * [Instructions to move an object in the QCDB](#instructions-to-move-an-object-in-the-qcdb)
 * [Asynchronous Data and Monte Carlo QC operations](#asynchronous-data-and-monte-carlo-qc-operations)
 * [QCG](#qcg)
    * [Display a non-standard ROOT object in QCG](#display-a-non-standard-root-object-in-qcg)
@@ -57,6 +60,7 @@ Advanced topics
    * [Data Sampling monitoring](#data-sampling-monitoring)
    * [Monitoring metrics](#monitoring-metrics)
    * [Common check IncreasingEntries](#common-check-increasingentries)
+   * [Update the shmem segment size of a detector](#update-the-shmem-segment-size-of-a-detector)
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 [← Go back to Post-processing](PostProcessing.md) | [↑ Go to the Table of Content ↑](../README.md) | [Continue to Frequently Asked Questions →](FAQ.md)
@@ -457,6 +461,28 @@ Feel free to consult the existing usage examples among other modules in the QC r
 
 Once a custom class is implemented, one should let QCG know how to display it correctly, which is explained in the subsection [Display a non-standard ROOT object in QCG](#display-a-non-standard-root-object-in-qcg).
 
+## Critical and non-critical tasks
+
+Some DPL devices can be marked as non-critical. It means that if they die the system will continue running. There is 
+obviously an impact as all the downstream devices won't get data. 
+
+In QC, one can mark a task as critical or non-critical: 
+
+```json
+    "tasks": {
+      "QcTask": {
+        "active": "true",
+        "critical": "false",     "": "if false the task is allowed to die without stopping the workflow, default: true",
+```
+
+By default, they are critical. 
+
+Mergers are critical or not based on the criticality of the task they are merging data for. 
+
+Checkers are non-critical. 
+
+Post-processing ???
+
 ## QC with DPL Analysis
 
 QC offers several ways to interact with the DPL Analysis framework.
@@ -1134,6 +1160,7 @@ the "tasks" path.
         "className": "namespace::of::Task", "": "Class name of the QC Task with full namespace.",
         "moduleName": "QcSkeleton",         "": "Library name. It can be found in CMakeLists of the detector module.",
         "detectorName": "TST",              "": "3-letter code of the detector.",
+        "critical": "true",                "": "if false the task is allowed to die without stopping the workflow, default: true",
         "cycleDurationSeconds": "10",       "": "Cycle duration (how often objects are published), 10 seconds minimum.",
                                             "": "The first cycle will be randomly shorter",
         "maxNumberCycles": "-1",            "": "Number of cycles to perform. Use -1 for infinite.",