Details
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Bug
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Status: Closed
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Major
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Resolution: Fixed
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4.0.0
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None
Description
Steps to reproduce:
- Create external table
- Run msck command to sync all the partitions with metastore
- Remove one of the partition path
- Run msck repair with partition filtering
Stack Trace:
2020-07-15T02:10:29,045 ERROR [4dad298b-28b1-4e6b-94b6-aa785b60c576 main] ppr.PartitionExpressionForMetastore: Failed to deserialize the expression java.lang.IndexOutOfBoundsException: Index: 110, Size: 0 at java.util.ArrayList.rangeCheck(ArrayList.java:657) ~[?:1.8.0_192] at java.util.ArrayList.get(ArrayList.java:433) ~[?:1.8.0_192] at org.apache.hive.com.esotericsoftware.kryo.util.MapReferenceResolver.getReadObject(MapReferenceResolver.java:60) ~[hive-exec-4.0.0-SNAPSHOT.jar:4.0.0-SNAPSHOT] at org.apache.hive.com.esotericsoftware.kryo.Kryo.readReferenceOrNull(Kryo.java:857) ~[hive-exec-4.0.0-SNAPSHOT.jar:4.0.0-SNAPSHOT] at org.apache.hive.com.esotericsoftware.kryo.Kryo.readObject(Kryo.java:707) ~[hive-exec-4.0.0-SNAPSHOT.jar:4.0.0-SNAPSHOT] at org.apache.hadoop.hive.ql.exec.SerializationUtilities$KryoWithHooks.readObject(SerializationUtilities.java:211) ~[hive-exec-4.0.0-SNAPSHOT.jar:4.0.0-SNAPSHOT] at org.apache.hadoop.hive.ql.exec.SerializationUtilities.deserializeObjectFromKryo(SerializationUtilities.java:806) ~[hive-exec-4.0.0-SNAPSHOT.jar:4.0.0-SNAPSHOT] at org.apache.hadoop.hive.ql.exec.SerializationUtilities.deserializeExpressionFromKryo(SerializationUtilities.java:775) ~[hive-exec-4.0.0-SNAPSHOT.jar:4.0.0-SNAPSHOT] at org.apache.hadoop.hive.ql.optimizer.ppr.PartitionExpressionForMetastore.deserializeExpr(PartitionExpressionForMetastore.java:96) [hive-exec-4.0.0-SNAPSHOT.jar:4.0.0-SNAPSHOT] at org.apache.hadoop.hive.ql.optimizer.ppr.PartitionExpressionForMetastore.convertExprToFilter(PartitionExpressionForMetastore.java:52) [hive-exec-4.0.0-SNAPSHOT.jar:4.0.0-SNAPSHOT] at org.apache.hadoop.hive.metastore.PartFilterExprUtil.makeExpressionTree(PartFilterExprUtil.java:48) [hive-standalone-metastore-server-4.0.0-SNAPSHOT.jar:4.0.0-SNAPSHOT] at org.apache.hadoop.hive.metastore.ObjectStore.getPartitionsByExprInternal(ObjectStore.java:3593) [hive-standalone-metastore-server-4.0.0-SNAPSHOT.jar:4.0.0-SNAPSHOT] at org.apache.hadoop.hive.metastore.VerifyingObjectStore.getPartitionsByExpr(VerifyingObjectStore.java:80) [hive-standalone-metastore-server-4.0.0-SNAPSHOT-tests.jar:4.0.0-SNAPSHOT] at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[?:1.8.0_192] at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[?:1.8.0_192]
Cause:
In case of msck repair with partition filtering we expect expression proxy class to be set as PartitionExpressionForMetastore ( https://github.com/apache/hive/blob/master/ql/src/java/org/apache/hadoop/hive/ql/ddl/misc/msck/MsckAnalyzer.java#L78 ), While dropping partition we serialize the drop partition filter expression as ( https://github.com/apache/hive/blob/master/standalone-metastore/metastore-server/src/main/java/org/apache/hadoop/hive/metastore/Msck.java#L589 ) which is incompatible during deserializtion happening in PartitionExpressionForMetastore ( https://github.com/apache/hive/blob/master/ql/src/java/org/apache/hadoop/hive/ql/optimizer/ppr/PartitionExpressionForMetastore.java#L52 ) hence the query fails with Failed to deserialize the expression.
Solutions:
I could think of two approaches to this problem
- Since PartitionExpressionForMetastore is required only during parition pruning step, We can switch back the expression proxy class to MsckPartitionExpressionProxy once the partition pruning step is done.
- The other solution is to make serialization process in msck drop partition filter expression compatible with the one with PartitionExpressionForMetastore, We can do this via Reflection since the drop partition serialization happens in Msck class (standadlone-metatsore) by this way we can completely remove the need for class MsckPartitionExpressionProxy and this also helps to reduce the complexity of Msck Repair command with parition filtering to work with ease (no need to set the expression proxyClass config).
I am personally inclined to the 2nd approach. Before moving on i want to know if this is the best approach or is there any other better/easier approach to solve this problem.
PS: qtest added in HIVE-22957 mainly focused on adding missing partition. Forgot to add case for dropping partition.
Attachments
Issue Links
- is caused by
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HIVE-22957 Support Partition Filtering In MSCK REPAIR TABLE Command
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- Closed
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- relates to
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- Closed
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- links to
