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https://issues.apache.org/jira/browse/PIG-5418?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Rohini Palaniswamy updated PIG-5418:
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Fix Version/s: 0.18.1
> Utils.parseSchema(String), parseConstant(String) leak memory
> ------------------------------------------------------------
>
> Key: PIG-5418
> URL: https://issues.apache.org/jira/browse/PIG-5418
> Project: Pig
> Issue Type: Improvement
> Reporter: Jacob Tolar
> Assignee: Jacob Tolar
> Priority: Minor
> Fix For: 0.18.1
>
> Attachments: PIG-5418.patch
>
>
> A minor issue: I noticed that Utils.parseSchema() and parseConstant() leak
> memory. I noticed this while running a unit test for a UDF several thousand
> times and checking the heap.
> Links are to latest commit as of creating this ticket:
> https://github.com/apache/pig/blob/59ec4a326079c9f937a052194405415b1e3a2b06/src/org/apache/pig/impl/util/Utils.java#L244-L256
> {{new PigContext()}} [creates a MapReduce
> ExecutionEngine|https://github.com/apache/pig/blob/59ec4a326079c9f937a052194405415b1e3a2b06/src/org/apache/pig/impl/PigContext.java#L269].
>
> This creates a
> [MapReduceLauncher|https://github.com/apache/pig/blob/59ec4a326079c9f937a052194405415b1e3a2b06/src/org/apache/pig/backend/hadoop/executionengine/mapReduceLayer/MRExecutionEngine.java#L34].
>
> This registers a [Hadoop shutdown
> hook|https://github.com/apache/pig/blob/59ec4a326079c9f937a052194405415b1e3a2b06/src/org/apache/pig/backend/hadoop/executionengine/mapReduceLayer/MapReduceLauncher.java#L104-L105]
> which doesn't go away until the JVM dies. See:
> https://hadoop.apache.org/docs/r2.8.2/hadoop-project-dist/hadoop-common/api/org/apache/hadoop/util/ShutdownHookManager.html
> .
> I will attach a proposed patch. From my reading of the code and running
> tests, the existing schema parse APIs do not actually use anything from this
> dummy PigContext, and with a minor tweak it can be passed in as NULL,
> avoiding the creation of these extra resources.
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