[teiid-issues] [JBoss JIRA] (TEIID-3443) wrong estimation of BufferFrontedFileStoreCache.maxMemoryBlocks

[Hisanobu Okuda (JIRA)]

Hisanobu Okuda created TEIID-3443:
-------------------------------------

             Summary: wrong estimation of BufferFrontedFileStoreCache.maxMemoryBlocks
                 Key: TEIID-3443
                 URL: https://issues.jboss.org/browse/TEIID-3443
             Project: Teiid
          Issue Type: Bug
          Components: Query Engine
    Affects Versions: 8.10, 8.4
         Environment: JDV 6.0.x, 6.1.0
            Reporter: Hisanobu Okuda
            Assignee: Steven Hawkins


BufferFrontedFileStoreCache.maxMemoryBlocks is under-estimated. For example, when max-storage-object-size=8000000, maxMemoryBlocks
is 488 at the line #575 in org.teiid.common.buffer.impl.BufferFrontedFileStoreCache.initialize() (after that, it is decrimented some times, but it does not matter).

{code}
main[1] run
> 
Breakpoint hit: "thread=MSC service thread 1-3", org.teiid.common.buffer.impl.BufferFrontedFileStoreCache.initialize(), line=573 bci=163
573    		maxMemoryBlocks = Math.min(maxMemoryBlocks, maxStorageObjectSize>>LOG_BLOCK_SIZE + ((maxStorageObjectSize&BufferFrontedFileStoreCache.BLOCK_MASK)>0?1:0));

MSC service thread 1-3[1] next
> 
Step completed: "thread=MSC service thread 1-3", org.teiid.common.buffer.impl.BufferFrontedFileStoreCache.initialize(), line=575 bci=198
575    		cleaningThreshold = Math.min(maxMemoryBlocks<<4, blocks>>1);

MSC service thread 1-3[1] dump this
 this = {
    ...snip...
    maxStorageObjectSize: 8000000
    ...snip...
    maxMemoryBlocks: 488
{code}

An actual cache object size for maxMemoryBlocks: 488 is roughly:-

{code}
8192 * 488 = 3997696
{code}

It is less than half of maxStorageObjectSize. It sometimes causes TEIID30001.



--
This message was sent by Atlassian JIRA
(v6.3.11#6341)