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https://issues.apache.org/jira/browse/IMPALA-9283?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17012291#comment-17012291
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Tim Armstrong commented on IMPALA-9283:
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[~twm378] [~stakiar] I think we probably solved this with some of the
connection timeout changes but I'm not sure if that's accurate or which ones
would solve this. Can we close it as a dupe?
> impala can not release the JDBC connection automatically
> ---------------------------------------------------------
>
> Key: IMPALA-9283
> URL: https://issues.apache.org/jira/browse/IMPALA-9283
> Project: IMPALA
> Issue Type: Bug
> Components: Backend
> Affects Versions: Impala 2.12.0
> Reporter: Ivan Cho
> Priority: Major
> Attachments: 1-1.png, 1.png, 2-1.png, 2-2.png, 2.png, 3.png,
> impalad_flags(coordinator-only), impalad_flags(executor-only)
>
>
> It looks like that impala can not release the JDBC connection automatically ,
> especially when jdbc client application crash down while running sql or with
> bed practice that have not call \{res.close()/stmt.close()/con.close()}
> explicitly .
> Here are some useful information:
> h2. 1 : the number of active connection has increased all the time utill we
> restarted the whole impala cluster (regulerly at midnight).
> coordinator flag : -fe_service_threads=2000 , and we have 3 one
> h2. see below
> !1.png|width=1623,height=582!
> h2. !1-1.png|width=510,height=575!
> h2. 2 : there are three main type of jdbc client applications:
> streamsets/hue/java . below is streamsets use case:
> !2.png|width=742,height=291!
> !2-1.png|width=929,height=248!
> h2. !2-2.png|width=580,height=34!
> h2. 3 : I did two jdbc tests with java application.
> Test 1 started 900 threads , and did not close connection resource after
> complete qurey sql , so the number of connection did not decrease
> Inversely , Test 2 started 500 threads , just close connection resource
> after complete qurey sql , so the number of connection decrease. see below
> !3.png|width=1317,height=437!
> ps: attachment are impalad_flags
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