Xuefu Zhang created HIVE-6179:
---------------------------------
Summary: OOM occurs when query spans to a large number of
partitions
Key: HIVE-6179
URL: https://issues.apache.org/jira/browse/HIVE-6179
Project: Hive
Issue Type: Bug
Components: Query Processor
Affects Versions: 0.12.0
Reporter: Xuefu Zhang
Assignee: Xuefu Zhang
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.
{code}
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)
{code}
The above error happened when executing "select count(*)" on a table with 40K
partitions.
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