Ratandeep Ratti created HIVE-13115:
--------------------------------------
Summary: MetaStore Direct SQL calls fail when the columns schema
for a partition is null
Key: HIVE-13115
URL: https://issues.apache.org/jira/browse/HIVE-13115
Project: Hive
Issue Type: Bug
Components: Hive
Affects Versions: 1.2.1
Reporter: Ratandeep Ratti
We are seeing the following exception in our MetaStore logs
{noformat}
2016-02-11 00:00:19,002 DEBUG metastore.MetaStoreDirectSql
(MetaStoreDirectSql.java:timingTrace(602)) - Direct SQL query in 5.842372ms +
1.066728ms, the query is [select "PARTITIONS"."PART_ID" from "PARTITIONS"
inner join "TBLS" on "PART
ITIONS"."TBL_ID" = "TBLS"."TBL_ID" and "TBLS"."TBL_NAME" = ? inner join
"DBS" on "TBLS"."DB_ID" = "DBS"."DB_ID" and "DBS"."NAME" = ? order by
"PART_NAME" asc]
2016-02-11 00:00:19,021 ERROR metastore.ObjectStore
(ObjectStore.java:handleDirectSqlError(2243)) - Direct SQL failed, falling back
to ORM
MetaException(message:Unexpected null for one of the IDs, SD 6437, column null,
serde 6437 for a non- view)
at
org.apache.hadoop.hive.metastore.MetaStoreDirectSql.getPartitionsViaSqlFilterInternal(MetaStoreDirectSql.java:360)
at
org.apache.hadoop.hive.metastore.MetaStoreDirectSql.getPartitions(MetaStoreDirectSql.java:224)
at
org.apache.hadoop.hive.metastore.ObjectStore$1.getSqlResult(ObjectStore.java:1563)
at
org.apache.hadoop.hive.metastore.ObjectStore$1.getSqlResult(ObjectStore.java:1559)
at
org.apache.hadoop.hive.metastore.ObjectStore$GetHelper.run(ObjectStore.java:2208)
at
org.apache.hadoop.hive.metastore.ObjectStore.getPartitionsInternal(ObjectStore.java:1570)
at
org.apache.hadoop.hive.metastore.ObjectStore.getPartitions(ObjectStore.java:1553)
at sun.reflect.GeneratedMethodAccessor43.invoke(Unknown Source)
at
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:483)
at
org.apache.hadoop.hive.metastore.RawStoreProxy.invoke(RawStoreProxy.java:108)
at com.sun.proxy.$Proxy5.getPartitions(Unknown Source)
at
org.apache.hadoop.hive.metastore.HiveMetaStore$HMSHandler.get_partitions(HiveMetaStore.java:2526)
at
org.apache.hadoop.hive.metastore.api.ThriftHiveMetastore$Processor$get_partitions.getResult(ThriftHiveMetastore.java:8747)
at
org.apache.hadoop.hive.metastore.api.ThriftHiveMetastore$Processor$get_partitions.getResult(ThriftHiveMetastore.java:8731)
at org.apache.thrift.ProcessFunction.process(ProcessFunction.java:39)
at org.apache.thrift.TBaseProcessor.process(TBaseProcessor.java:39)
at
org.apache.hadoop.hive.thrift.HadoopThriftAuthBridge20S$Server$TUGIAssumingProcessor$1.run(HadoopThriftAuthBridge20S.java:617)
at
org.apache.hadoop.hive.thrift.HadoopThriftAuthBridge20S$Server$TUGIAssumingProcessor$1.run(HadoopThriftAuthBridge20S.java:613)
at java.security.AccessController.doPrivileged(Native Method)
at javax.security.auth.Subject.doAs(Subject.java:422)
at
org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1591)
at
org.apache.hadoop.hive.thrift.HadoopThriftAuthBridge20S$Server$TUGIAssumingProcessor.process(HadoopThriftAuthBridge20S.java:613)
at
org.apache.thrift.server.TThreadPoolServer$WorkerProcess.run(TThreadPoolServer.java:206)
at
java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
at
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
at java.lang.Thread.run(Thread.java:745)
{noformat}
This direct SQL call fails for every {{getPartitions}} call and then falls back
to ORM.
The query which fails is
{code}
select
PARTITIONS.PART_ID, SDS.SD_ID, SDS.CD_ID,
SERDES.SERDE_ID, PARTITIONS.CREATE_TIME,
PARTITIONS.LAST_ACCESS_TIME, SDS.INPUT_FORMAT, SDS.IS_COMPRESSED,
SDS.IS_STOREDASSUBDIRECTORIES, SDS.LOCATION, SDS.NUM_BUCKETS,
SDS.OUTPUT_FORMAT, SERDES.NAME, SERDES.SLIB
from PARTITIONS
left outer join SDS on PARTITIONS.SD_ID = SDS.SD_ID
left outer join SERDES on SDS.SERDE_ID = SERDES.SERDE_ID
where PART_ID in ( ? ) order by PART_NAME asc;
{code}
By looking at the source {{MetaStoreDirectSql.java}}, the third column in the
query ( SDS.CD_ID), the column descriptor ID, is null, which triggers the
exception. This exception is not thrown from the ORM layer since it is more
forgiving to the null column descriptor. See ObjectStore.java:1197
{code}
List<MFieldSchema> mFieldSchemas = msd.getCD() == null ? null :
msd.getCD().getCols();
{code}
I verified that this exception gets triggered in the first place when we add a
new partition without setting column level schemas for the partition, using the
MetaStoreClient API. This exception does not occur when adding partitions using
the CLI
I see two ways to solve the issue.
1. Make the MetaStoreClient API more strict and not allow creating partition
without having column level schemas set. (This could break clients which use
the MetaStoreclient API)
2. Make the Direct SQL code path and the ORM code path more consistent, where
the Direct SQL does not fail on null column descriptor ID.
I feel 2 is more safer and easier to fix.
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