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From "Bryan Pendleton (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (DERBY-6818) java.lang.OutOfMemoryError
Date Wed, 10 Jun 2015 14:18:00 GMT

    [ https://issues.apache.org/jira/browse/DERBY-6818?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14580563#comment-14580563
] 

Bryan Pendleton commented on DERBY-6818:
----------------------------------------

To clarify: It was the ALTER TABLE statement that ran out of memory? If so, it
certainly seems like we only need to sort the key column(s), not the non-key column(s).

> java.lang.OutOfMemoryError
> --------------------------
>
>                 Key: DERBY-6818
>                 URL: https://issues.apache.org/jira/browse/DERBY-6818
>             Project: Derby
>          Issue Type: Bug
>          Components: JDBC
>    Affects Versions: 10.11.1.1
>         Environment: Using Derby disk database with JBoss eap 6.4.
>            Reporter: Mattias
>
> We got a 'java.lang.OutOfMemoryError: Java heap space' when using a Derby disk database
with the following schema.
> {code}
> CREATE TABLE TEST (   ID BIGINT NOT NULL
> ,   NEXT _ID BIGINT
> ,   PREV_ ID BIGINT
> ,   TEST_XML XML);
> ALTER TABLE TABLE
>         ADD PRIMARY KEY
>                 (ID);
> {code}
> I opened the heap dump with Eclipse Memory Analyzer and found that tree instances of
org.apache.derby.impl.store.access.sort.MergeInserter occupies 290 MB of memory (that is 66
% of the total heap)  
> The problem seems to be that MergeInserter holds a sort buffer that contains complete
rows and the TEST_XML is about 160 kB each. MergeInserter has an advanced algorithm to calculate
the allowed size of the buffer, but is it necessary store the complete row in the buffer,
i.e. the non-indexed values (TEST_XML is this case)?
> Is there some property I can set to limit the buffer size or is it possible to rewrite
the SQL schema someway to exclude the XML type from the buffer?
> Following is the dominator tree from Eclipse Memory Analyzer:
> {code}
> org.apache.derby.impl.store.access.sort.MergeInserter @ 0xe3f72e20                  
                                                                                         
                                                                                         
                                        |           72 |   127 533 080 |     30,76%
> |- org.apache.derby.impl.store.access.sort.SortBuffer @ 0xe3f73018                  
                                                                                         
                                                                                         
                                        |           48 |   127 532 792 |     30,76%
> |  |- org.apache.derby.impl.store.access.sort.Node @ 0xe3fed5e0                     
                                                                                         
                                                                                         
                                        |           40 |       164 384 |      0,04%
> |  |  '- org.apache.derby.iapi.types.DataValueDescriptor[4] @ 0xee3da280            
                                                                                         
                                                                                         
                                        |           32 |       164 344 |      0,04%
> |  |     |- org.apache.derby.iapi.types.SQLClob @ 0xee3da2a0                        
                                                                                         
                                                                                         
                                        |           56 |       164 240 |      0,04%
> |  |     |  |- java.lang.String @ 0xee3da2d8  < ?xml version="1.0"?...|          
24 |       164 160 |      0,04%
> |  |     |  |- char[1][] @ 0xee3da2f0                                               
                                                                                         
                                                                                         
                                        |           24 |            24 |      0,00%
> |  |     |  '- Total: 2 entries                                                     
                                                                                         
                                                                                         
                                        |              |               |          
> |  |     |- org.apache.derby.iapi.types.SQLLongint @ 0xee3da308                     
                                                                                         
                                                                                         
                                        |           24 |            24 |      0,00%
> |  |     |- org.apache.derby.iapi.types.SQLLongint @ 0xee3da320                     
                                                                                         
                                                                                         
                                        |           24 |            24 |      0,00%
> |  |     |- org.apache.derby.iapi.types.SQLLongint @ 0xee3da338                     
                                                                                         
                                                                                         
                                        |           24 |            24 |      0,00%
> |  |     '- Total: 4 entries                                                        
                                                                                         
                                                                                         
                                        |              |               |          
> |  |- org.apache.derby.impl.store.access.sort.Node @ 0xe3fed608                     
                                                                                         
                                                                                         
                                        |           40 |       164 384 |      0,04%
> |  |- org.apache.derby.impl.store.access.sort.Node @ 0xe3fed630                     
                                                                                         
                                                                                         
                                        |           40 |       164 384 |      0,04%
> |  |- org.apache.derby.impl.store.access.sort.Node @ 0xe3fed658                     
                                                                                         
                                                                                         
                                        |           40 |       164 384 |      0,04%
> |  |- org.apache.derby.impl.store.access.sort.Node @ 0xe3fed680                     
                                                                                         
                                                                                         
                                        |           40 |       164 384 |      0,04%
> |  |- org.apache.derby.impl.store.access.sort.Node @ 0xe3fed6a8                     
                                                                                         
                                                                                         
                                        |           40 |       164 384 |      0,04%
> |  |- org.apache.derby.impl.store.access.sort.Node @ 0xe3fed6d0                     
                                                                                         
                                                                                         
                                        |           40 |       164 384 |      0,04%
> |  |- org.apache.derby.impl.store.access.sort.Node @ 0xe3fed6f8                     
                                                                                         
                                                                                         
                                        |           40 |       164 384 |      0,04%
> |  |- org.apache.derby.impl.store.access.sort.Node @ 0xe3fed720                     
                                                                                         
                                                                                         
                                        |           40 |       164 384 |      0,04%
> |  |- org.apache.derby.impl.store.access.sort.Node @ 0xe3fedd50                     
                                                                                         
                                                                                         
                                        |           40 |       164 384 |      0,04%
> |  |- org.apache.derby.impl.store.access.sort.Node @ 0xe3fedd78                     
                                                                                         
                                                                                         
                                        |           40 |       164 384 |      0,04%
> |  |- org.apache.derby.impl.store.access.sort.Node @ 0xe3fedda0                     
                                                                                         
                                                                                         
                                        |           40 |       164 384 |      0,04%
> |  |- org.apache.derby.impl.store.access.sort.Node @ 0xe3feddc8                     
                                                                                         
                                                                                         
                                        |           40 |       164 384 |      0,04%
> |  |- org.apache.derby.impl.store.access.sort.Node @ 0xe3fedff8                     
                                                                                         
                                                                                         
                                        |           40 |       164 384 |      0,04%
> |  |- org.apache.derby.impl.store.access.sort.Node @ 0xe3fef5c8                     
                                                                                         
                                                                                         
                                        |           40 |       164 384 |      0,04%
> |  |- org.apache.derby.impl.store.access.sort.Node @ 0xe3fef5f0                     
                                                                                         
                                                                                         
                                        |           40 |       164 384 |      0,04%
> |  |- org.apache.derby.impl.store.access.sort.Node @ 0xe3fef618                     
                                                                                         
                                                                                         
                                        |           40 |       164 384 |      0,04%
> |  |- org.apache.derby.impl.store.access.sort.Node @ 0xe3ff01f8                     
                                                                                         
                                                                                         
                                        |           40 |       164 384 |      0,04%
> |  |- org.apache.derby.impl.store.access.sort.Node @ 0xe3ff04c8                     
                                                                                         
                                                                                         
                                        |           40 |       164 384 |      0,04%
> |  |- org.apache.derby.impl.store.access.sort.Node @ 0xe3ff0608                     
                                                                                         
                                                                                         
                                        |           40 |       164 384 |      0,04%
> |  |- org.apache.derby.impl.store.access.sort.Node @ 0xe3ff0630                     
                                                                                         
                                                                                         
                                        |           40 |       164 384 |      0,04%
> |  |- org.apache.derby.impl.store.access.sort.Node @ 0xe3ff0658                     
                                                                                         
                                                                                         
                                        |           40 |       164 384 |      0,04%
> |  |- org.apache.derby.impl.store.access.sort.Node @ 0xe3ff0680                     
                                                                                         
                                                                                         
                                        |           40 |       164 384 |      0,04%
> |  |- org.apache.derby.impl.store.access.sort.Node @ 0xe3ff06a8                     
                                                                                         
                                                                                         
                                        |           40 |       164 384 |      0,04%
> |  |- org.apache.derby.impl.store.access.sort.Node @ 0xe3ff06d0                     
                                                                                         
                                                                                         
                                        |           40 |       164 384 |      0,04%
> |  '- Total: 25 of 780 entries; 755
> {code}
> This is a snippet of my jboss standalone.xml:
> {code:xml}
>         <datasources>
>                 <xa-datasource jndi-name="java:/jdbc/MYDB" pool-name="mydb_Pool" enabled="true">
>                     <xa-datasource-property name="DatabaseName">
>                         mydb
>                     </xa-datasource-property>
>                     <xa-datasource-property name="CreateDatabase">
>                         create
>                     </xa-datasource-property>
>                     <driver>derby-embedded</driver>
>                     <xa-pool>
>                         <is-same-rm-override>false</is-same-rm-override>
>                     </xa-pool>
>                     <security>
>                         <user-name>sa</user-name>
>                         <password>admin</password>
>                     </security>
>                 </xa-datasource>
>        
> {code}



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