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new 2b04e6d add note on consistency of results for sys.segments queries
(#7034)
2b04e6d is described below
commit 2b04e6d0bcfd98b0e5169eadbd91a52d2bd22a76
Author: Surekha <surekha.saha...@imply.io>
AuthorDate: Tue Feb 19 10:52:37 2019 -0800
add note on consistency of results for sys.segments queries (#7034)
* add doc
* change docs
* PR comments
* few more changes
---
docs/content/querying/sql.md | 2 ++
1 file changed, 2 insertions(+)
diff --git a/docs/content/querying/sql.md b/docs/content/querying/sql.md
index 3f27491..883904c 100644
--- a/docs/content/querying/sql.md
+++ b/docs/content/querying/sql.md
@@ -571,6 +571,8 @@ The "sys" schema provides visibility into Druid segments,
servers and tasks.
### SEGMENTS table
Segments table provides details on all Druid segments, whether they are
published yet or not.
+#### CAVEAT
+Note that a segment can be served by more than one stream ingestion tasks or
Historical processes, in that case it would have multiple replicas. These
replicas are weakly consistent with each other when served by multiple
ingestion tasks, until a segment is eventually served by a Historical, at that
point the segment is immutable. Broker prefers to query a segment from
Historical over an ingestion task. But if a segment has multiple realtime
replicas, for eg. kafka index tasks, and one t [...]
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