[HIVE-6179] OOM occurs when query spans to a large number of partitions

• Type: Bug
• Status: Open
• Priority: Major
• Resolution: Unresolved
• Affects Version/s: 0.12.0
• Component/s: Query Processor
• Assignee: Xuefu Zhang
• Reporter: Xuefu Zhang
• Created: 09/Jan/14 21:31
• Updated: 03/Jan/17 10:42

Description

When executing a query against a large number of partitions, such as "select count(*) from table", OOM error may occur because Hive fetches the metadata for all partitions involved and tries to store it in memory.

2014-01-09 13:14:17,090 ERROR metastore.RetryingHMSHandler (RetryingHMSHandler.java:invoke(141)) - java.lang.OutOfMemoryError: Java heap space
        at java.util.Arrays.copyOf(Arrays.java:2367)
        at java.lang.AbstractStringBuilder.expandCapacity(AbstractStringBuilder.java:130)
        at java.lang.AbstractStringBuilder.ensureCapacityInternal(AbstractStringBuilder.java:114)
        at java.lang.AbstractStringBuilder.append(AbstractStringBuilder.java:415)
        at java.lang.StringBuffer.append(StringBuffer.java:237)
        at org.apache.derby.impl.sql.conn.GenericStatementContext.appendErrorInfo(Unknown Source)
        at org.apache.derby.iapi.services.context.ContextManager.cleanupOnError(Unknown Source)
        at org.apache.derby.impl.jdbc.TransactionResourceImpl.handleException(Unknown Source)
        at org.apache.derby.impl.jdbc.EmbedConnection.handleException(Unknown Source)
        at org.apache.derby.impl.jdbc.ConnectionChild.handleException(Unknown Source)
        at org.apache.derby.impl.jdbc.EmbedResultSet.closeOnTransactionError(Unknown Source)
        at org.apache.derby.impl.jdbc.EmbedResultSet.movePosition(Unknown Source)
        at org.apache.derby.impl.jdbc.EmbedResultSet.next(Unknown Source) 
        at org.datanucleus.store.rdbms.query.ForwardQueryResult.nextResultSetElement(ForwardQueryResult.java:191)
        at org.datanucleus.store.rdbms.query.ForwardQueryResult$QueryResultIterator.next(ForwardQueryResult.java:379)
        at org.apache.hadoop.hive.metastore.MetaStoreDirectSql.loopJoinOrderedResult(MetaStoreDirectSql.java:641)
        at org.apache.hadoop.hive.metastore.MetaStoreDirectSql.getPartitionsViaSqlFilterInternal(MetaStoreDirectSql.java:410)
        at org.apache.hadoop.hive.metastore.MetaStoreDirectSql.getPartitions(MetaStoreDirectSql.java:205)
        at org.apache.hadoop.hive.metastore.ObjectStore.getPartitionsInternal(ObjectStore.java:1433)
        at org.apache.hadoop.hive.metastore.ObjectStore.getPartitions(ObjectStore.java:1420)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        at java.lang.reflect.Method.invoke(Method.java:601)
        at org.apache.hadoop.hive.metastore.RetryingRawStore.invoke(RetryingRawStore.java:122)
        at com.sun.proxy.$Proxy7.getPartitions(Unknown Source)
        at org.apache.hadoop.hive.metastore.HiveMetaStore$HMSHandler.get_partitions(HiveMetaStore.java:2128)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        at java.lang.reflect.Method.invoke(Method.java:601)
        at org.apache.hadoop.hive.metastore.RetryingHMSHandler.invoke(RetryingHMSHandler.java:103)

The above error happened when executing "select count(*)" on a table with 40K partitions.

Issue Links

• is related to: HIVE-7195 Improve Metastore performance