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From "Mike Matrigali (Updated) (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (DERBY-3785) Race conditions on Field mon_numWritesToLog in class org/apache/derby/impl/store/raw/log/LogAccessFile
Date Tue, 21 Feb 2012 07:59:32 GMT

     [ https://issues.apache.org/jira/browse/DERBY-3785?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Mike Matrigali updated DERBY-3785:
----------------------------------

     Labels: derby_triage10_5_2 derby_triage10_9  (was: derby_triage10_5_2)
    Summary: Race conditions on Field mon_numWritesToLog in class org/apache/derby/impl/store/raw/log/LogAccessFile
  (was: Race conditions on Field mon_numWritesToLog in class org/apache/derby/impl/store/raw/log/LogAccessFile

)

Triaged for 10.9, no changes.
                
> Race conditions on Field mon_numWritesToLog in class org/apache/derby/impl/store/raw/log/LogAccessFile

> -------------------------------------------------------------------------------------------------------
>
>                 Key: DERBY-3785
>                 URL: https://issues.apache.org/jira/browse/DERBY-3785
>             Project: Derby
>          Issue Type: Bug
>          Components: Store
>    Affects Versions: 10.3.3.0
>         Environment: Linux/X86
>            Reporter: Yao Qi
>            Priority: Minor
>              Labels: derby_triage10_5_2, derby_triage10_9
>   Original Estimate: 1h
>  Remaining Estimate: 1h
>
> Our dynamic race detection tool found one race condition in derby 10.4.  Even that code
is for debugging/statistics, we still believe that it is a bug, and should be fixed.
> Data Race 8 : 14109 : org/apache/derby/impl/store/raw/log/LogAccessFile : mon_numWritesToLog
>   Thread DRDAConnThread_12 id: 20 : WRITE
>        Lock Set : [ 966(org/apache/derby/impl/jdbc/EmbedConnection30), ]
>       [org.apache.derby.impl.store.raw.log.LogAccessFile : writeToLog : 805]
>       [org.apache.derby.impl.store.raw.log.LogAccessFile : flushDirtyBuffers : 534]
>       [org.apache.derby.impl.store.raw.log.LogToFile : flush : 4015]
>       [org.apache.derby.impl.store.raw.log.LogToFile : flush : 1777]
>       [org.apache.derby.impl.store.raw.data.BaseDataFileFactory : flush : 1369]
>       [org.apache.derby.impl.store.raw.data.BaseDataFileFactory : addContainer : 862]^M
>       [org.apache.derby.impl.store.raw.xact.Xact : addContainer : 1329]
>       [org.apache.derby.impl.store.access.heap.Heap : create : 274]
>       [org.apache.derby.impl.store.access.heap.HeapConglomerateFactory : createConglomerate
: 195]
>       [org.apache.derby.impl.store.access.RAMTransaction : createConglomerate : 826]
>       [org.apache.derby.impl.sql.execute.CreateTableConstantAction : executeConstantAction
: 201]
>       [org.apache.derby.impl.sql.execute.MiscResultSet : open : 64]
>       [org.apache.derby.impl.sql.GenericPreparedStatement : execute : 372]
>       [org.apache.derby.impl.jdbc.EmbedStatement : executeStatement : 1235]
>       [org.apache.derby.impl.jdbc.EmbedStatement : execute : 625]
>       [org.apache.derby.impl.jdbc.EmbedStatement : executeUpdate : 175]
>       [org.apache.derby.impl.drda.DRDAConnThread : parseEXCSQLIMM : 4940]
>       [org.apache.derby.impl.drda.DRDAConnThread : processCommands : 739]
>       [org.apache.derby.impl.drda.DRDAConnThread : run : 279]
>   Thread DRDAConnThread_9 id: 16 : READ
>        Lock Set : [ 968(org/apache/derby/impl/jdbc/EmbedConnection30), ]
>        Vector Clock : [ 0 2 0 0 0 0 0 0 0 0 0 0 0 0 3 3 6 ]
>       [org.apache.derby.impl.store.raw.log.LogAccessFile : writeToLog : 805]
>       [org.apache.derby.impl.store.raw.log.LogAccessFile : flushDirtyBuffers : 534]
>       [org.apache.derby.impl.store.raw.log.LogToFile : flush : 4015]
>       [org.apache.derby.impl.store.raw.log.LogToFile : flush : 1777]
>       [org.apache.derby.impl.store.raw.data.BaseDataFileFactory : flush : 1369]
>       [org.apache.derby.impl.store.raw.data.BaseDataFileFactory : addContainer : 862]
>       [org.apache.derby.impl.store.raw.xact.Xact : addContainer : 1329]
>       [org.apache.derby.impl.store.access.heap.Heap : create : 274]
>       [org.apache.derby.impl.store.access.heap.HeapConglomerateFactory : createConglomerate
: 195]
>       [org.apache.derby.impl.store.access.RAMTransaction : createConglomerate : 826]
>       [org.apache.derby.impl.sql.execute.CreateTableConstantAction : executeConstantAction
: 201]
>       [org.apache.derby.impl.sql.execute.MiscResultSet : open : 64]
>       [org.apache.derby.impl.sql.GenericPreparedStatement : execute : 372]
>       [org.apache.derby.impl.jdbc.EmbedStatement : executeStatement : 1235]
>       [org.apache.derby.impl.jdbc.EmbedStatement : execute : 625]
>       [org.apache.derby.impl.jdbc.EmbedStatement : executeUpdate : 175]
>       [org.apache.derby.impl.drda.DRDAConnThread : parseEXCSQLIMM : 4940]
>       [org.apache.derby.impl.drda.DRDAConnThread : processCommands : 739]
>       [org.apache.derby.impl.drda.DRDAConnThread : run : 279]
> 		if (SanityManager.DEBUG)  
>               	{ 
> 			mon_numWritesToLog++;  <-- line 805, 
> 			mon_numBytesToLog += len; 
> 		} 

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