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new 7d3987b [CARBONDATA-3492]: Added prepriming in the Index Server
Documentation
7d3987b is described below
commit 7d3987b0bd54bd3d381b94871c9873cf618154ce
Author: Vikram Ahuja <vikramahuja8...@gmail.com>
AuthorDate: Wed Jan 8 11:59:21 2020 +0530
[CARBONDATA-3492]: Added prepriming in the Index Server Documentation
This PR consists of the documentation changes for the feature Index Server
Cache Prepriming.
This closes #3566
---
docs/index-server.md | 15 ++++++++++++++-
1 file changed, 14 insertions(+), 1 deletion(-)
diff --git a/docs/index-server.md b/docs/index-server.md
index 7aff6df..7eba589 100644
--- a/docs/index-server.md
+++ b/docs/index-server.md
@@ -116,9 +116,20 @@ meaning that no matter how small the splits are they would
be written to the fil
102400KB which will mean if the size of the splits for a executor cross this
value then they would
be written to file.
-The user can set the location for these file by using
'carbon.indexserver.temp.path'. By default
+The user can set the location for these files by using
'carbon.indexserver.temp.path'. By default
table path would be used to write the files.
+## Prepriming
+As each query is responsible for caching the pruned datamaps, thus a lot of
execution time is wasted in reading the
+files and caching the datmaps for the first query.
+To avoid this problem we have introduced Pre-Priming which allows each data
manipulation command like load, insert etc
+to fire a request to the index server to load the corresponding segments into
the index server.
+When index server receives a request it checks whether the request is for
pre-priming, if it is then the request is
+processed in a new thread, and a dummy response is immediately returned to the
client.
+Since pre-priming acts as an async call, it does not have any negative
performance impacts.
+
+The user can enable prepriming by using 'carbon.indexserver.enable.prepriming'
= 'true/false'. By default this is set as false.
+
## Configurations
##### carbon.properties(JDBCServer)
@@ -130,6 +141,8 @@ table path would be used to write the files.
| carbon.index.server.port | NA | The port on which the index server is
started. |
| carbon.disable.index.server.fallback | false | Whether to enable/disable
fallback for index server. Should be used for testing purposes only. Refer:
[Fallback](#fallback)|
|carbon.index.server.max.jobname.length|NA|The max length of the job to show
in the index server service UI. For bigger queries this may impact performance
as the whole string would be sent from JDBCServer to IndexServer.|
+|carbon.indexserver.enable.prepriming|false|Enable the use of prepriming in
the Index Server to improve the performance of first time query.|
+
##### carbon.properties(IndexServer)
