liu ming updated TRAFODION-2623:
    Issue Type: New Feature  (was: Bug)

> Port Esgyn DTM changes to Trafodion
> -----------------------------------
>                 Key: TRAFODION-2623
>                 URL: https://issues.apache.org/jira/browse/TRAFODION-2623
>             Project: Apache Trafodion
>          Issue Type: New Feature
>          Components: dtm
>    Affects Versions: 2.2-incubating
>            Reporter: Sean Broeder
>            Assignee: Sean Broeder
>             Fix For: 2.2-incubating
> There are a very large number of changes present in the DTM components from 
> Esgyn that are not present in Trafodion.  It is not practicable to cherry 
> pick these changes as the two environments are quite different and every 
> cherry pick attempt I tried involved complicated  manual merges.  As a 
> consequence, a large port of DTM changes en masse would be both easier 
> approach and also safer since the Esgyn code has been much more thoroughly 
> tested.
> A sample of the fixes included are:
>  Dozens of bug fixes
>     Improved recovery after HBase failures
>     Better error reporting and tracing, which includes region keys for easier 
> debugging
>     Reduced UnknownTransactionExceptions resulting from duplicate transaction 
> registration
>     Better TLOG management including reducing the default number of tables
> This is the first porting of Esgyn changes.  There will need to be additional 
> , smaller porting effort.  Ultimately the goal is to get the 2 DTM version 
> close enough that cherry picking will become normal and future mass portings 
> will not be necessary. 

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