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https://issues.apache.org/jira/browse/HIVE-4075?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13587301#comment-13587301
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Brock Noland commented on HIVE-4075:
------------------------------------
Either making the methods synchronized or using a ConcurrentHashMap should
resolve the infinite loop. Since the TypeInfo objects are read only and it
appears the keys/values will never be null in this class, I think a
ConcurrentHashMap will work.
> TypeInfoFactory is not thread safe and is access by multiple threads
> --------------------------------------------------------------------
>
> Key: HIVE-4075
> URL: https://issues.apache.org/jira/browse/HIVE-4075
> Project: Hive
> Issue Type: Bug
> Affects Versions: 0.10.0
> Reporter: Brock Noland
>
> TypeInfoFactory is not thread safe and when accessed by multiple threads
> calls to any of the methods can modify hashmaps concurrently resulting in
> infinite loops.
> {noformat}
> "pool-1-thread-240" prio=10 tid=0x00002aabd8bf7000 nid=0x5f4a runnable
> [0x0000000044626000]
> java.lang.Thread.State: RUNNABLE
> at java.util.HashMap.get(HashMap.java:303)
> at
> org.apache.hadoop.hive.serde2.typeinfo.TypeInfoFactory.getStructTypeInfo(TypeInfoFactory.java:94)
>
> at
> org.apache.hadoop.hive.serde2.lazy.LazySimpleSerDe.initSerdeParams(LazySimpleSerDe.java:237)
>
> at
> org.apache.hadoop.hive.serde2.lazy.LazySimpleSerDe.initialize(LazySimpleSerDe.java:182)
>
> at
> org.apache.hadoop.hive.metastore.MetaStoreUtils.getDeserializer(MetaStoreUtils.java:203)
>
> at
> org.apache.hadoop.hive.ql.metadata.Table.getDeserializerFromMetaStore(Table.java:260)
>
> at org.apache.hadoop.hive.ql.metadata.Table.checkValidity(Table.java:167)
> at org.apache.hadoop.hive.ql.metadata.Hive.getTable(Hive.java:930)
> at
> org.apache.hadoop.hive.ql.parse.DDLSemanticAnalyzer.analyzeDropTable(DDLSemanticAnalyzer.java:706)
>
> at
> org.apache.hadoop.hive.ql.parse.DDLSemanticAnalyzer.analyzeInternal(DDLSemanticAnalyzer.java:212)
>
> at
> org.apache.hadoop.hive.ql.parse.BaseSemanticAnalyzer.analyze(BaseSemanticAnalyzer.java:246)
>
> at org.apache.hadoop.hive.ql.Driver.compile(Driver.java:432)
> at org.apache.hadoop.hive.ql.Driver.compile(Driver.java:337)
> at org.apache.hadoop.hive.ql.Driver.run(Driver.java:906)
> - locked <0x00002aaac6e1c270> (a java.lang.Object)
> at
> org.apache.hive.service.cli.operation.SQLOperation.run(SQLOperation.java:94)
> {noformat}
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