[pulsar] 35/38: Add note for bookkeeper explicit LAC (#6908)

[zh...@apache.org]

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zhaijia pushed a commit to branch branch-2.5
in repository https://gitbox.apache.org/repos/asf/pulsar.git

commit 026a610db59e3c69863f83c46731dc473806bd6a
Author: lipenghui <pe...@apache.org>
AuthorDate: Fri May 8 00:22:28 2020 +0800

    Add note for bookkeeper explicit LAC (#6908)
    
    (cherry picked from commit b9e96098062b5968a7de24e44644688dff66d474)
---
 site2/docs/sql-deployment-configurations.md | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/site2/docs/sql-deployment-configurations.md b/site2/docs/sql-deployment-configurations.md
index 65653f0..b986a54 100644
--- a/site2/docs/sql-deployment-configurations.md
+++ b/site2/docs/sql-deployment-configurations.md
@@ -152,4 +152,7 @@ presto> SELECT * FROM system.runtime.nodes;
  2       | http://192.168.2.3:8081 | testversion  | false       | active 
 ```
 
-For more information about deployment in Presto, refer to [Presto deployment](https://prestodb.io/docs/current/installation/deployment.html).
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+For more information about deployment in Presto, refer to [Presto deployment](https://prestodb.io/docs/current/installation/deployment.html).
+
+> Note  
+> The broker does not advance LAC, so when Pulsar SQL bypass broker to query data, it can only read entries up to the LAC that all the bookies learned. You can enable periodically write LAC on the broker by setting "bookkeeperExplicitLacIntervalInMills" in the broker.conf.
\ No newline at end of file