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Subject [GitHub] surekhasaharan commented on a change in pull request #6094: Introduce SystemSchema tables (#5989)
Date Mon, 24 Sep 2018 22:45:38 GMT
surekhasaharan commented on a change in pull request #6094: Introduce SystemSchema tables (#5989)
URL: https://github.com/apache/incubator-druid/pull/6094#discussion_r220012235
 
 

 ##########
 File path: docs/content/querying/sql.md
 ##########
 @@ -519,6 +524,89 @@ SELECT * FROM INFORMATION_SCHEMA.COLUMNS WHERE TABLE_SCHEMA = 'druid'
AND TABLE_
 |COLLATION_NAME||
 |JDBC_TYPE|Type code from java.sql.Types (Druid extension)|
 
+## SYSTEM SCHEMA
+
+The sys schema provides visibility into Druid segments, servers and tasks.
+For example to retrieve all segments for datasource "wikipedia", use the query:
+```sql
+SELECT * FROM sys.segments WHERE datasource = 'wikipedia'
+```
+
+### SEGMENTS table
+Segments table provides details on all Druid segments, whether they are published yet or
not.
+
+
+|Column|Notes|
+|------|-----|
+|segment_id|Unique segment identifier|
+|datasource|Name of datasource|
+|start|Interval start time (in ISO 8601 format)|
+|end|Interval end time (in ISO 8601 format)|
+|size|Size of segment in bytes|
+|version|Version number (generally an ISO8601 timestamp corresponding to when the segment
set was first started)|
+|partition_num|Partition number (an integer, unique within a datasource+interval+version;
may not necessarily be contiguous)|
+|num_replicas|Number of replicas of this segment currently being served|
+|num_rows|Number of rows in current segment, this value could be null if unkown to broker
at query time|
+|is_published|True if this segment has been published to the metadata store|
+|is_available|True if this segment is currently being served by any server|
+|is_realtime|True if this segment is being served on a realtime server|
+|payload|Jsonified datasegment payload|
+
+### SERVERS table
+Servers table lists all data servers(any server that hosts a segment). It includes both historicals
and peons.
+
+|Column|Notes|
+|------|-----|
+|server|Server name in the form host:port|
+|scheme|Server scheme http or https|
+|server_type|Type of Druid service. Possible values include: historical, realtime, bridge
and indexer_executor.|
 
 Review comment:
   okay, removed `bridge`

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