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Add / check sub connections usage with handles #22

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morazow opened this issue Oct 23, 2018 · 0 comments
Closed

Add / check sub connections usage with handles #22

morazow opened this issue Oct 23, 2018 · 0 comments

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@morazow
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morazow commented Oct 23, 2018

This might solve the problem when there are few Spark tasks than Exasol nodes and sub-connections are blocked.
jpizagno pushed a commit to jpizagno/spark-exasol-connector that referenced this issue Nov 1, 2018
@morazow
Use handle in jdbc subconnections
a1ae9f5 
Instead of running execute query on each sub-connection separately, we run it in main connection
upfront. Then, each sub connection only requests the result set using a handle.

One important knowledge is that if the handle is -1 then this means empty result set and we return
empty iterator.

This should fix exasol#22
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@morazow