[
https://issues.apache.org/jira/browse/KYLIN-4137?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17030429#comment-17030429
]
Alexander commented on KYLIN-4137:
----------------------------------
Hello, this commit broke Convert Cuboid Data to HFile step in my v3.0.0-beta
environment. I don't use mysql.
Just add couple TopN measures, and COUNT_DISTINCT with more than one column
(i.e. COUNT_DISTINCT seller_id, buyer_id).
As result MeasureDesc -> FunctionDesc -> ParameterDesc -> PlainParameter
serialization exception.
If i make it (PlainParameter implements Serializable) serializable, then
ContentReader.java
T r = serializer.deserialize(din);
deserialize without ParameterDesc.nextParameter wich causes error.
Reverting this commit, solve problem for me.
> Accelerate metadata reloading
> -----------------------------
>
> Key: KYLIN-4137
> URL: https://issues.apache.org/jira/browse/KYLIN-4137
> Project: Kylin
> Issue Type: Improvement
> Components: Metadata
> Affects Versions: v2.6.2
> Reporter: Temple Zhou
> Assignee: Temple Zhou
> Priority: Minor
> Fix For: v3.0.0-beta
>
>
> Now, org.apache.kylin.metadata.cachesync.CachedCrudAssist#reloadAll is using
> an inappropriate method to deal with MySQLJdbcMetadata.
> As the every call of reloadAt(path) will access the database, which is almost
> fine to HBase but really unfriendly to the MySQL(RDBMS).
> I think we should get all of the resource with single request instead of the
> separate request to get every resource.
--
This message was sent by Atlassian Jira
(v8.3.4#803005)
