[ https://issues.apache.org/jira/browse/LUCENENET-358?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Digy closed LUCENENET-358. -------------------------- Resolution: Invalid No response so far. Closing this issue. DIGY > CloseableThreadLocal memory leak in LocalDataStoreSlot (with workaround) > ------------------------------------------------------------------------- > > Key: LUCENENET-358 > URL: https://issues.apache.org/jira/browse/LUCENENET-358 > Project: Lucene.Net > Issue Type: Bug > Environment: Microsoft WIndows Server 2008 Enterprise x64. SP2. > .NET Framework 4.0 > Reporter: Rezgar Cadro > Priority: Critical > Attachments: CloseableThreadLocal MemoryLeak.patch > > > Recently we have been suffering from a severe memory leak when executing > intense open/close operations on IndexSearcher and IndexModifier. > Memory profiling showed that memory is being held by LocalDataStore[] objects. > After some digging, the root of the problem has been found in > CloseableThreadLocal class: > private System.LocalDataStoreSlot t = > System.Threading.Thread.AllocateDataSlot(); > What we see is that every instantiated object of CloseableThreadLocal causes > new data slot allocation performed for every thread. > Thread.AllocateDataSlot() does not simply allocate a new slot, replacing an > old one, but enlarging an existing buffer in-thread, appending data to the > end of internal LocalDataStore[] collection, which causes a severe memory > leak . > As long as "t" variable is instantiated on every object creation, and (in > current class implementation) every object is used by a single thread, > replacing "private System.LocalDataStoreSlot t = > System.Threading.Thread.AllocateDataSlot();" with simple "private object > dataSlot;" and removing "hardRefs" Dictionary solves the problem and prevents > memory leak. > We have tried to implement the expected behavior by using [ThreadStatic] > attribute instead of LocalDataStoreSlot, but the attempt failed because of > unexpected exceptions being thrown. > Patch can be found at Lucene.Net repository under -- This message is automatically generated by JIRA. - You can reply to this email to add a comment to the issue online.