[teiid-issues] [JBoss JIRA] (TEIID-2714) Buffer defrag not working

[Steven Hawkins (JIRA)]

    [ https://issues.jboss.org/browse/TEIID-2714?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12825896#comment-12825896 ] 

Steven Hawkins commented on TEIID-2714:
---------------------------------------

The fix addressed several things:

1. the immediate issue that defrag was unable to read the appropriate header values for storage blocks.
2. the notion of truncation and defrag were too intertwined - an empty storage file would not be truncated as we wouldn't defrag it.
3. corrected that -1 would be returned as the compacted highest bit set when the segment is empty
4. adjusted the thresholds for defrag and sleep behavior
                
> Buffer defrag not working
> -------------------------
>
>                 Key: TEIID-2714
>                 URL: https://issues.jboss.org/browse/TEIID-2714
>             Project: Teiid
>          Issue Type: Bug
>          Components: Query Engine
>    Affects Versions: 7.7
>            Reporter: Steven Hawkins
>            Assignee: Steven Hawkins
>             Fix For: 8.6
>
>
> The defrag task is not working as expected because the header values are written by an object output stream - and not as standalone values into the block data.
> For most data usage patterns this isn't an issue as the storage files are self compacting over time due to low block assignments. 

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