The brtloader is now at 95.03% lines covered and 84.64% of branches taken.  That's pretty good.  We can work to remove a few more, but it's diminishing returns from here.  [t:2647] Refs #2647.


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#2642 runs with -r 1000 and no valgrind problems.  The problem is we must actually call fclose even when injecting errors in bad_fclose.  [t:2642] Refs #2642

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Fix at least one problem found by the loader-cleanup-test.  Make the valgrind version of loader-cleanup-test use {{{-r 1000}}} so it runs faster.  Refs #2642. [t:2642]

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closes[t:2639] recover from translation table realloc failures in the allocate block function of the brtloader. merge -r 20450:head from tokudb.2639

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{{{
svn merge -r 20428:20432 https://svn.tokutek.com/tokudb/toku/tokudb.2623
}}}
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Merge the basic dbufio working test in.  It doesn't test destination files, and the failure cases aren't running yet.  But the ...dbufio() code looks fairly well covered anyway. [t:2623] Refs #2623.
{{{
svn merge -r 20423:20425 https://svn.tokutek.com/tokudb/toku/tokudb.2623
}}}
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{{{
svn merge -r 20415:20420 https://svn.tokutek.com/tokudb/toku/tokudb.2623
}}}
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{{{
svn merge -r 20381:20412 https://svn.tokutek.com/tokudb/toku/tokudb.2623
}}}
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Windows port: ENODATA->TOKUDB_NO_DATA, disable unreachable code warning, disabled trace_mem for windows

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Merge #2623 changes onto main line.  The new test fails, but I need to get a merge from main again.  Refs #2623. [t:2623]
{{{
svn merge -r 20348:20378 https://svn.tokutek.com/tokudb/toku/tokudb.2623
}}}
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Closes [t:2624] Added toku_os_close() which retries on EINTR.  Closes [t:2621] Added toku_os_open(), toku_os_fopen(), toku_os_fdopen(), toku_os_fclose() and related override hooks  db_env_set_func_open(), db_env_set_func_fopen(), db_env_set_func_fdopen(), db_env_set_func_fclose(). Modified test program loader-cleanup-test to use new hooks to inject synthetic errors.  Marked some error cases in brtloader.c. with ###.

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