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#2840 refs[t:2840] add debug prints to the loader to help fix the dbufio read row problem, also remove the assert on this error path

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Cleaning up of rollback logs in toku_rollback_txn_close is indicative of a problem that should cause a crash right away,
not the next time you start up mysql.

This might be the direct cause of global's problem,
but requires another bug to exist (rollback nodes must not have been cleaned up during a 'successful' abort or commit
first in order for the 'cleanup' to cause a problem)

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{{{
svn merge -r22020:22070 https://svn.tokutek.com/tokudb/toku/tokudb.2755c
}}}
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When processing suppress_rollback log entry, associate brt with transaction.

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Fixes #2782.  The brtloader uses temp dir.   Note however that #2783 isn't fixed yet. close[t:2782].

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 * That's 2/3 of 3/4, which is calculated as 1/4 is unreservable.  The loader asks for 2/3 of what's reservable, getting one half.
The second loader gets 1/6 of cachetable memory.
 * That's 2/3 of 1/4: The loader asks for 2/3 of what's reservable.  1/2 has been reserved.  1/4 is unreservable.  1/4 is reservable.  2/3 of 1/4 is 1/6.
The third loader gets 1/18 of cachetable memory. 
 * That's 2/3 or 1/12.   (1/4 is unreservable. 1/2 was reserved by the first loader.  1/6 by the second.  That leaves 1/12)
Generally the next one gets 1/3 of what the previous one got.

Refs #2759. [t:2759]


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{{{
svn merge -r21499:21502 https://svn.tokutek.com/tokudb/toku/tokudb.2755
}}}
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Candidate fix for #2730 (the race in the loader and the io-thread where they glare at each other).  Refs #2730. [t:2730]

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[t:2721] Add -k option to loader-cleanup-test to test only abort-via-poll, but test it exhaustively for any size database.


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[t:2721] Improve loader-cleanup-test to return non-zero from polling function for different cases (first time, second time, etc., just like error injection).

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dbt.size should be length of string, not size of pointer

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