nixos/hadoop: release notes
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guide</link> is available.
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</para>
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</listitem>
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<listitem>
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<para>
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Improvements have been made to the Hadoop module and package:
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</para>
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<itemizedlist spacing="compact">
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<listitem>
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<para>
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HDFS and YARN now support production-ready highly
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available deployments with automatic failover.
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</para>
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</listitem>
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<listitem>
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<para>
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Hadoop now defaults to Hadoop 3, updated from 2.
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</para>
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</listitem>
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<listitem>
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<para>
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JournalNode, ZKFS and HTTPFS services have been added.
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</para>
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</listitem>
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</itemizedlist>
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</listitem>
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<listitem>
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<para>
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Activation scripts can now opt int to be run when running
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@ -18,6 +18,11 @@ In addition to numerous new and upgraded packages, this release has the followin
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- 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.
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- Improvements have been made to the Hadoop module and package:
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- HDFS and YARN now support production-ready highly available deployments with automatic failover.
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- Hadoop now defaults to Hadoop 3, updated from 2.
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- JournalNode, ZKFS and HTTPFS services have been added.
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- Activation scripts can now opt int to be run when running `nixos-rebuild dry-activate` and detect the dry activation by reading `$NIXOS_ACTION`.
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This allows activation scripts to output what they would change if the activation was really run.
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The users/modules activation script supports this and outputs some of is actions.
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