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From "Alex Araujo (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (PHOENIX-4413) Possible queryserver memory leak when reusing connections and statements
Date Wed, 29 Nov 2017 18:00:00 GMT

     [ https://issues.apache.org/jira/browse/PHOENIX-4413?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Alex Araujo updated PHOENIX-4413:
---------------------------------
    Affects Version/s: 4.13.0

> Possible queryserver memory leak when reusing connections and statements
> ------------------------------------------------------------------------
>
>                 Key: PHOENIX-4413
>                 URL: https://issues.apache.org/jira/browse/PHOENIX-4413
>             Project: Phoenix
>          Issue Type: Bug
>    Affects Versions: 4.12.0, 4.13.0
>            Reporter: Alex Araujo
>
> While testing client-side connection pooling using the [C# client from Microsoft|https://github.com/Azure/hdinsight-phoenix-sharp],
we attempted to avoid creating new connections and statements for every Phoenix statement
execution (essentially just a simple SELECT for single key).  The results were very positive
from a performance perspective.  However, after a certain amount of statements executed in
this manner, memory on the PQS appears to spike, and performance degrades significantly.
> Steps to Recreate
> Setup
> 1) Create the table: "CREATE TABLE  <TableName> (TestKey varchar(255) PRIMARY KEY,
TestValue varchar(10000))".
> 2) Populate the table with 100 random TestKey and TestValue records.
> Execution (if done with one thread, this can take up to 24 hours, so we multithreaded
it)
> 1) Create connection using OpenConnectionRequestAsync.
> 2) Create statement using CreateStatementRequestAsync.
> 3) Loop n times, selecting a record with a single random key: "SELECT TestKey, TestValue
FROM <TableName> WHERE TestKey = <TestKey>'' issued using PrepareAndExecuteRequestAsync.
> 4) Close statement.
> 5) Close connection.
> Teardown
> 1) Drop the table.



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