···

       
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39
       
 
       
      </listitem>

     

       
40
       
40
       
 
       
      <listitem>

     

       
41
       
41
       
 
       
        <para>

     

       
42
       
42
       
+
       
          spark now defaults to spark 3, updated from 2. A

     

       
43
       
43
       
+
       
          <link xlink:href="https://spark.apache.org/docs/latest/core-migration-guide.html#upgrading-from-core-24-to-30">migration

     

       
44
       
44
       
+
       
          guide</link> is available.

     

       
45
       
45
       
+
       
        </para>

     

       
46
       
46
       
+
       
      </listitem>

     

       
47
       
47
       
+
       
      <listitem>

     

       
48
       
48
       
+
       
        <para>

     

       
42
       
49
       
 
       
          Activation scripts can now opt int to be run when running

     

       
43
       
50
       
 
       
          <literal>nixos-rebuild dry-activate</literal> and detect the

     

       
44
       
51
       
 
       
          dry activation by reading <literal>$NIXOS_ACTION</literal>.

     
···

       
248
       
255
       
 
       
          analysis. Documented in

     

       
249
       
256
       
 
       
          <link linkend="module-services-parsedmarc">its manual

     

       
250
       
257
       
 
       
          entry</link>.

     

       
258
       
258
       
+
       
        </para>

     

       
259
       
259
       
+
       
      </listitem>

     

       
260
       
260
       
+
       
      <listitem>

     

       
261
       
261
       
+
       
        <para>

     

       
262
       
262
       
+
       
          <link xlink:href="https://spark.apache.org/">spark</link>, a

     

       
263
       
263
       
+
       
          unified analytics engine for large-scale data processing.

     

       
251
       
264
       
 
       
        </para>

     

       
252
       
265
       
 
       
      </listitem>

     

       
253
       
266
       
 
       
    </itemizedlist>

     

···

       
14
       
14
       
 
       


     

       
15
       
15
       
 
       
- PostgreSQL now defaults to major version 13.

     

       
16
       
16
       
 
       


     

       
17
       
17
       
+
       
- spark now defaults to spark 3, updated from 2. A [migration guide](https://spark.apache.org/docs/latest/core-migration-guide.html#upgrading-from-core-24-to-30) is available.

     

       
18
       
18
       
+
       


     

       
17
       
19
       
 
       
- Activation scripts can now opt int to be run when running `nixos-rebuild dry-activate` and detect the dry activation by reading `$NIXOS_ACTION`.

     

       
18
       
20
       
 
       
  This allows activation scripts to output what they would change if the activation was really run.

     

       
19
       
21
       
 
       
  The users/modules activation script supports this and outputs some of is actions.

     
···

       
77
       
79
       
 
       
  which parses incoming [DMARC](https://dmarc.org/) reports and stores

     

       
78
       
80
       
 
       
  or sends them to a downstream service for further analysis.

     

       
79
       
81
       
 
       
  Documented in [its manual entry](#module-services-parsedmarc).

     

       
82
       
82
       
+
       


     

       
83
       
83
       
+
       
- [spark](https://spark.apache.org/), a unified analytics engine for large-scale data processing.

     

       
80
       
84
       
 
       


     

       
81
       
85
       
 
       
## Backward Incompatibilities {#sec-release-21.11-incompatibilities}

     

       
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86