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Posted to dev@lens.apache.org by "Deepak Barr (JIRA)" <ji...@apache.org> on 2015/05/22 09:30:17 UTC

[jira] [Created] (LENS-576) Cannot retrieve query results on lens server restart

Deepak Barr created LENS-576:
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             Summary: 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


In the event of lens server restart, We can not obtain the query result by calling "/queryuiapi/queries/{queryHandle}/httpresultset" API  as LensPersistentResult is 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.

Suggestion:
One way to solve this issue could be to simply serialize the QueryOutputFormatter variable in QueryContext.



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