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https://issues.apache.org/jira/browse/TRAFODION-3107?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16511470#comment-16511470
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Sandhya Sundaresan commented on TRAFODION-3107:
-----------------------------------------------
Explain plan shows the 16MB columns with 5MB data being selected out :
|1. Explain after 50 rows:
SQL>Explain select * from JDBC_PERFORMANCE.CLOB_PERFORMANCE;
------------------------------------------------------------------ PLAN SUMMARY
MODULE_NAME .............. DYNAMICALLY COMPILED
STATEMENT_NAME ........... NOT NAMED
PLAN_ID .................. 212395526813421710
ROWS_OUT ............... 100
EST_TOTAL_COST ........... 0.18
STATEMENT ................ select * from JDBC_PERFORMANCE.CLOB_PERFORMANCE;
------------------------------------------------------------------ NODE LISTING
ROOT ====================================== SEQ_NO 2 ONLY CHILD 1
REQUESTS_IN .............. 1
ROWS_OUT ............... 100
EST_OPER_COST ............ 0
EST_TOTAL_COST ........... 0.18
DESCRIPTION
est_memory_per_node .... 10240.00(Limit), 0.00(BMOs), 0.00(nBMOs) MB
max_card_est ......... 100
fragment_id ............ 0
parent_frag ............ (none)
fragment_type .......... master
record_length 16,777,226
affinity_value ......... 0
max_max_cardinality 100
xn_access_mode ......... read_only
xn_autoabort_interval 0
auto_query_retry ....... enabled
plan_version ....... 2,600
embedded_arkcmp ........ used
ObjectUIDs ............. 1283125847997263334
select_list ............ TRAFODION.JDBC_PERFORMANCE.CLOB_PERFORMANCE.ID,
TRAFODION.JDBC_PERFORMANCE.CLOB_PERFORMANCE.LOB_CO
LUMN
TRAFODION_SCAN ============================ SEQ_NO 1 NO CHILDREN
TABLE_NAME ............... CLOB_PERFORMANCE
REQUESTS_IN .............. 1
ROWS_OUT ............... 100
EST_OPER_COST ............ 0.18
EST_TOTAL_COST ........... 0.18
DESCRIPTION
max_card_est ......... 100
fragment_id ............ 0
parent_frag ............ (none)
fragment_type .......... master
record_length 16,777,226
scan_type .............. subset scan of table TRAFODION.JDBC_PERFORMANCE.CLOB
_PERFORMANCE
object_type ............ Trafodion
columns ................ all
begin_keys(incl)
end_keys(incl)
cache_size ........... 100
cache_blocks ........... OFF
probes ................. 1
rows_accessed ........ 100
column_retrieved ....... #1:1
key_columns ............ ID
--- SQL operation complete.|
> selct count(0) with long varchar hitting jvm OOM error
> --------------------------------------------------------
>
> Key: TRAFODION-3107
> URL: https://issues.apache.org/jira/browse/TRAFODION-3107
> Project: Apache Trafodion
> Issue Type: Bug
> Reporter: Sandhya Sundaresan
> Assignee: Sandhya Sundaresan
> Priority: Major
> Fix For: 2.3
>
>
> selct count(0) hitting jvm OOM error when clob as varchar and insert some 5MB
> images.
> org.trafodion.jdbc.t4.TrafT4Exception: *** ERROR[8448] Unable to access Hbase
> interface. Call to ExpHbaseInterface::nextRow returned error
> HBASE_ACCESS_ERROR(-706). Cause: java.util.concurrent.ExecutionException:
> org.apache.hadoop.hbase.client.RetriesExhaustedException: Failed after
> attempts=3, exceptions:
> Tue Jun 05 10:53:33 CST 2018,
> RpcRetryingCaller\{globalStartTime=1528167213257, pause=100, retries=3},
> java.lang.RuntimeException: java.lang.OutOfMemoryError: Java heap space
> Tue Jun 05 10:53:34 CST 2018,
> RpcRetryingCaller\{globalStartTime=1528167213257, pause=100, retries=3},
> java.lang.RuntimeException: java.lang.OutOfMemoryError: Java heap space
> Tue Jun 05 10:53:34 CST 2018,
> RpcRetryingCaller\{globalStartTime=1528167213257, pause=100, retries=3},
> java.lang.RuntimeException: java.lang.OutOfMemoryError: Java heap space
>
> java.util.concurrent.FutureTask.report(FutureTask.java:122)
> java.util.concurrent.FutureTask.get(FutureTask.java:192)
> org.trafodion.sql.HTableClient.fetchRows(HTableClient.java:1287) Caused by
> org.apache.hadoop.hbase.client.RetriesExhaustedException: Failed after
> attempts=3, exceptions:
> Tue Jun 05 10:53:33 CST 2018,
> RpcRetryingCaller\{globalStartTime=1528167213257, pause=100, retries=3},
> java.lang.RuntimeException: java.lang.OutOfMemoryError: Java heap space
> Tue Jun 05 10:53:34 CST 2018,
> RpcRetryingCaller\{globalStartTime=1528167213257, pause=100, retries=3},
> java.lang.RuntimeException: java.lang.OutOfMemoryError: Java heap space
> Tue Jun 05 10:53:34 CST 2018,
> RpcRetryingCaller\{globalStartTime=1528167213257, pause=100, retries=3},
> java.lang.RuntimeException: java.lang.OutOfMemoryError: Java heap space
>
> org.apache.hadoop.hbase.client.RpcRetryingCaller.callWithRetries(RpcRetryingCaller.java:157)
> org.apache.hadoop.hbase.client.ResultBoundedCompletionService$QueueingFuture.run(ResultBoundedCompletionService.java:80)
> java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
> java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
> java.lang.Thread.run(Thread.java:745) Caused by
> java.lang.RuntimeException: java.lang.OutOfMemoryError: Java heap space
> org.apache.hadoop.hbase.client.RpcRetryingCaller.callWithoutRetries(RpcRetryingCaller.java:218)
> org.apache.hadoop.hbase.client.ScannerCallableWithReplicas$RetryingRPC.call(ScannerCallableWithReplicas.java:397)
> org.apache.hadoop.hbase.client.ScannerCallableWithReplicas$RetryingRPC.call(ScannerCallableWithReplicas.java:371)
> org.apache.hadoop.hbase.client.RpcRetryingCaller.callWithRetries(RpcRetryingCaller.java:136)
> org.apache.hadoop.hbase.client.ResultBoundedCompletionService$QueueingFuture.run(ResultBoundedCompletionService.java:80)
> java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
> java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
> java.lang.Thread.run(Thread.java:745) Caused by
> java.lang.OutOfMemoryError: Java heap space. [2018-06-05 10:53:34]
> at
> org.trafodion.jdbc.t4.TrafT4Messages.throwSQLException(TrafT4Messages.java:211)
> at
> org.trafodion.jdbc.t4.InterfaceResultSet.fetch(InterfaceResultSet.java:857)
> at org.trafodion.jdbc.t4.TrafT4ResultSet.next(TrafT4ResultSet.java:2786)
> at
> org.jdbctest.performance.lob.LobPerformance.test_clob_photo_normal(LobPerformance.java:1469)
> at
> org.jdbctest.performance.lob.LobPerformance.test_jdbc_api(LobPerformance.java:374)
> at
> org.jdbctest.performance.lob.LobPerformance.main(LobPerformance.java:319)
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