[jira] [Created] (IMPALA-10398) Altering an Iceberg table might throw NullPointerException

["Zoltán Borók-Nagy (Jira)" <ji...@apache.org>]

Zoltán Borók-Nagy created IMPALA-10398:
------------------------------------------

             Summary: Altering an Iceberg table might throw NullPointerException
                 Key: IMPALA-10398
                 URL: https://issues.apache.org/jira/browse/IMPALA-10398
             Project: IMPALA
          Issue Type: Bug
            Reporter: Zoltán Borók-Nagy


IcebergSchemaConverter has a static thread local member which can be uninitialized in the current thread when nextId() is invoked.
 
In that case the thread local integer's get() method returns a null and we get a NullPointerException when we want to convert it to a builtin int.
{noformat}
I1215 17:25:28.418272 22202 jni-util.cc:288] java.lang.NullPointerException
 at org.apache.impala.util.IcebergSchemaConverter.nextId(IcebergSchemaConverter.java:179)
 at org.apache.impala.util.IcebergSchemaConverter.fromImpalaType(IcebergSchemaConverter.java:162)
 at org.apache.impala.util.IcebergSchemaConverter.fromImpalaColumnType(IcebergSchemaConverter.java:121)
 at org.apache.impala.service.IcebergCatalogOpExecutor.addColumn(IcebergCatalogOpExecutor.java:103)
 at org.apache.impala.service.CatalogOpExecutor.alterIcebergTable(CatalogOpExecutor.java:972)
 at org.apache.impala.service.CatalogOpExecutor.alterTable(CatalogOpExecutor.java:701)
 at org.apache.impala.service.CatalogOpExecutor.execDdlRequest(CatalogOpExecutor.java:370)
 at org.apache.impala.service.JniCatalog.execDdl(JniCatalog.java:171){noformat}
 
Because of this issue test_alter_iceberg_tables is flaky, especially on systems with a high number of CPUs.
 
The error can be reproduced by restarting the Impala cluster and adding complex types to an Iceberg table, e.g.:
 
 
{noformat}
ALTER TABLE ice_table
ADD COLUMNS(map_test MAP <STRING, array <STRING>>, struct_test STRUCT <f1: BIGINT, f2: BIGINT>);{noformat}
 
 



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