[
https://issues.apache.org/jira/browse/LENS-576?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14805086#comment-14805086
]
Deepak Barr commented on LENS-576:
----------------------------------
For -
2. How to handle serialization of members that come from third party libraries
(Hive/Hadoop) that are not implementing Serializable.
I see that LensResultSetMetadata has a method getColumns() to obtain
List<ColumnDescriptor>. Can we change this to List<FieldSchemaData> ? As I
see, JDBCResultSetMetadata also converts constructs ColumnDescriptor from
FieldSchemaData and also, the metadata information that /resultsetmetadata API
returns is well contained in FieldSchemaData, which is our own class and easily
serializable.
> Cannot retrieve query results on lens server restart
> ----------------------------------------------------
>
> Key: LENS-576
> URL: https://issues.apache.org/jira/browse/LENS-576
> Project: Apache Lens
> Issue Type: Bug
> Reporter: Deepak Barr
> Assignee: Deepak Barr
> Priority: Critical
> Fix For: 2.4
>
>
> In the event of lens server restart, We can not obtain the query result by
> calling "/queryuiapi/queries/{queryHandle}/httpresultset" API as
> LensPersistentResult does not get created. This is because
> QueryOutputFormatter variable in QueryContext object is always null.This
> QueryOutputFormatter is important to create LensPersistedResultSet (see
> getResultset() method in QueryExecutionServiceImpl class) .
> Reason : One can see that QueryOutputFormatter variable in QueryContext class
> is not serialized. Therefore, on server restart, this variable is always null
> in QueryContext for all queries.
--
This message was sent by Atlassian JIRA
(v6.3.4#6332)
