[GitHub] [incubator-hudi] vinothchandar commented on a change in pull request #1267: [HUDI-403] Publish deployment guide for writing to Hudi using HoodieDeltaStreamer and Spark Data Source

[GitBox <gi...@apache.org>]

vinothchandar commented on a change in pull request #1267: [HUDI-403] Publish deployment guide for writing to Hudi using HoodieDeltaStreamer and Spark Data Source
URL: https://github.com/apache/incubator-hudi/pull/1267#discussion_r369646846
 
 

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 File path: docs/_docs/2_6_deployment.md
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 @@ -23,15 +23,25 @@ All in all, Hudi deploys with no long running servers or additional infrastructu
 using existing infrastructure and its heartening to see other systems adopting similar approaches as well. Hudi writing is done via Spark jobs (DeltaStreamer or custom Spark datasource jobs), deployed per standard Apache Spark [recommendations](https://spark.apache.org/docs/latest/cluster-overview.html).
 Querying Hudi tables happens via libraries installed into Apache Hive, Apache Spark or Presto and hence no additional infrastructure is necessary. 
 
+### DeltaStreamer
 
+[DeltaStreamer](/docs/writing_data.html#deltastreamer) is the standalone utility to incrementally pull upstream changes from varied sources such as DFS, Kafka and DB Changelogs and ingest them to hudi tables. It runs as a spark application in 2 modes.
+
+ - **Run Once Mode** : In this mode, Deltastreamer performs one ingestion round which includes incrementally pulling events from upstream sources and ingesting them to hudi table. Background operations like cleaning old file versions and archiving hoodie timeline are automatically executed as part of the run. For Merge-On-Read tables, Compaction is also run inline as part of ingestion unless disabled by passing the flag "--disable-compaction". By default, Compaction is run inline for every ingestion run and this can be changed by setting the property "hoodie.compact.inline.max.delta.commits". You can either manually run this spark application or use any cron trigger or workflow orchestrator such as Apache Airflow to spawn this application.
 
 Review comment:
   call out this is the default? 

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