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https://issues.apache.org/jira/browse/PIG-5160?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15894618#comment-15894618
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Anyi Li commented on PIG-5160:
------------------------------
[~daijy] I have attached new patch by removing commented logging message,
please take a look at it again. Thanks
> SchemaTupleFrontend.java is not thread safe, cause PigServer thrown NPE in
> multithread env
> ------------------------------------------------------------------------------------------
>
> Key: PIG-5160
> URL: https://issues.apache.org/jira/browse/PIG-5160
> Project: Pig
> Issue Type: Bug
> Affects Versions: 0.17.0
> Reporter: Anyi Li
> Assignee: Anyi Li
> Labels: patch
> Attachments: PIG_5160-1.patch, PIG_5160.patch
>
>
> Calling PigServer in multi-thread environment will randomly throw NPE at
> {code}
> Caused by: org.apache.pig.backend.executionengine.ExecException: ERROR 0:
> java.lang.NullPointerException
> at
> org.apache.pig.backend.hadoop.executionengine.HExecutionEngine.launchPig(HExecutionEngine.java:310)
> at org.apache.pig.PigServer.launchPlan(PigServer.java:1390)
> at
> org.apache.pig.PigServer.executeCompiledLogicalPlan(PigServer.java:1375)
> at org.apache.pig.PigServer.storeEx(PigServer.java:1034)
> ... 6 more
> Caused by: java.lang.NullPointerException
> at
> org.apache.pig.data.SchemaTupleFrontend.registerToGenerateIfPossible(SchemaTupleFrontend.java:255)
> at
> org.apache.pig.newplan.logical.relational.LogToPhyTranslationVisitor.visit(LogToPhyTranslationVisitor.java:876)
> at
> org.apache.pig.newplan.logical.relational.LOForEach.accept(LOForEach.java:87)
> at
> org.apache.pig.newplan.DependencyOrderWalker.walk(DependencyOrderWalker.java:75)
> at org.apache.pig.newplan.PlanVisitor.visit(PlanVisitor.java:52)
> at
> org.apache.pig.backend.hadoop.executionengine.HExecutionEngine.compile(HExecutionEngine.java:260)
> at
> org.apache.pig.backend.hadoop.executionengine.HExecutionEngine.launchPig(HExecutionEngine.java:295)
> ... 9 more
> {code}
> because SchemaTupleFrontend.java has lots of static methods which refer to
> static variables. Need a patch to create threadlocal variables to make it
> thread safe
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