[GitHub] [incubator-training] greatgautam commented on issue #63: Training-27: Hadoop Training Slides

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greatgautam commented on issue #63: Training-27: Hadoop Training Slides
URL: https://github.com/apache/incubator-training/pull/63#issuecomment-562691273
 
 
   Hi Ryan,
   Thanks. I have added commands as well. Please review.
   
   regards,
   Gautam
   
   On Fri, Dec 6, 2019 at 3:03 AM RyanSkraba <no...@github.com> wrote:
   
   > *@RyanSkraba* commented on this pull request.
   >
   > Hey, sorry for not coming back to this and thanks for addressing all the
   > non-content points I raised.
   >
   > I actually thought the content was still ongoing! (I added a comment
   > pointing to an empty slide)
   > ------------------------------
   >
   > In content/Hadoop/src/main/asciidoc/index.adoc
   > <https://github.com/apache/incubator-training/pull/63#discussion_r354771610>
   > :
   >
   > > +== HDFS Checkpoint node
   > +
   > +Checkpoint node performs periodic checkpoints of the namespace.
   > +It helps minimize the size of the log stored at the NameNode containing changes to the HDFS.
   > +It replaces the role previously filled by the Secondary NameNode.
   > +The NameNode allows multiple Checkpoint nodes simultaneously, as long as there are no Backup nodes registered with the system.
   > +
   > +
   > +== HDFS Backup node
   > +
   > +Backup node is an extension to the Checkpoint node.
   > +In addition to checkpointing it also receives a stream of edits from the NameNode.
   > +It maintains its own in-memory copy of the namespace, which is always in sync with the active NameNode namespace state.
   > +Only one Backup node may be registered with the NameNode at once.
   > +
   > +== HDFS Commands
   >
   > Empty slide!
   >
   > —
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