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[t:4372] some words about checkpoints, cleaner threads, and flusher threads, plus how flusher functions operate with a generalized advice structure


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[t:2949] Revert memory status to old design to avoid issues in portability layer, make translation to new system in ydb.c.  Refs #2949.

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[t:2949] Cast status value for FS_ENOSPC_REDZONE_STATE as fs_redzone_state to placate icc.  Refs #2949.

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[t:2949] Merge from tokudb.2949 with command, executed at sandbox/toku {{{svn merge -r39023:HEAD tokudb.2949 tokudb}}}.  Refs #2949.

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[t:4436] reverting make_db_h.c back to pre 39075, keeping fix for 4436, updating headers as a result


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close[t:4436] removed row_size_supported in favor of a more straighforward ydb call to get the maximum permitted key and row sizes. updated the headers, updated the test, updated the ydb layer.


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close[t:4442] Add a diagnostic message during recovery for the env directory not existing or not being a directory. Closes #4442.

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close[t:4435].  Merge the changes in for #4435 (no more {{{chdir()}}} allowed during recovery) to main.  {{{svn merge -r 39184:39201 ../tokudb.4435}}}.  Closes #4435.


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