maria_read_log used to always print a warning message at startup
to say it is unsafe if ALTER TABLE was used. Now it prints it only
if the log does show the problem (=ALTER TABLE or CREATE SELECT, which
both disable logging of REDO_INSERT*).
For that, when ha_maria::external_lock() disables transactionality
it writes a LOGREC_INCOMPLETE_LOG to the log, which "maria_read_log -a"
picks up to write a warning.
REPAIR TABLE also disables those REDO_INSERT* but as maria_read_log
executes LOGREC_REDO_REPAIR no warning is needed.


storage/maria/ha_maria.cc:
  as we now log a record when disabling transactionility, we need the
  TRN to be set up first
storage/maria/ma_blockrec.c:
  comment
storage/maria/ma_loghandler.c:
  new type of log record
storage/maria/ma_loghandler.h:
  new type of log record
storage/maria/ma_recovery.c:
  * maria_apply_log() now returns a count of warnings. What currently
  produces warnings is:
  - skipping applying UNDOs though there are some (=> inconsistent table)
  - replaying log (in maria_read_log) though the log contains some
  ALTER TABLE or CREATE SELECT (log misses REDO_INSERT* for those
  and is so incomplete).
  Count of warnings affects the final message of maria_read_log and
  recovery (though in recovery none of the two conditions above should
  happen).
  * maria_read_log used to always print a warning message at startup
  to say it is unsafe if ALTER TABLE was used. Now it prints it only
  if the log does show the problem, i.e. ALTER TABLE or CREATE SELECT
  was used (both disable logging of REDO_INSERT* as those records are
  not needed for recovery; those missing records in turn make
  recreation-from-scratch, via maria_read_log, impossible). For that,
  when ha_maria::external_lock() disables transactionality,
  _ma_tmp_disable_logging_for_table() writes a LOGREC_INCOMPLETE_LOG to
  the log, which maria_apply_log() picks up to write a warning.
storage/maria/ma_recovery.h:
  maria_apply_log() returns a count of warnings
storage/maria/maria_def.h:
  _ma_tmp_disable_logging_for_table() grows so becomes a function
storage/maria/maria_read_log.c:
  maria_apply_log can now return a count of warnings, to temper the
  "SUCCESS" message printed in the end by maria_read_log.
  Advise users to make a backup first.

possibility, if requested in the test, to do byte-for-byte comparison
of data files after recovery. This makes sense only when testing
REDOs, as UNDO phase generates new log records thus data pages get
new LSNs. First test of maria-recovery.test is changed to test only
REDOs and do byte-for-byte comparison.


mysql-test/include/maria_make_snapshot.inc:
  possibility to compare physically the data files (makes sense
  only if testing REDO phase).
mysql-test/include/maria_verify_recovery.inc:
  allow physical comparison of data files after recovery if requested
mysql-test/r/maria-recovery.result:
  result update (first test tests REDO only now)
mysql-test/t/maria-recovery.test:
  first test tests REDO only now, and thus can do byte-for-byte
  comparison of data files.

See test maria-recovery.test for a model; all include scripts have
an "API" section at start if they do take parameters from outside.
* Fixing bug reported by Jani and Monty (when two REDOs about the same
page in one group, see ma_blockrec.c). 
* Fixing small bugs in recovery


mysql-test/include/wait_until_connected_again.inc:
  be sure to enter the loop (the previous query by the caller may not have
  failed: it could be
  query;
  mysqladmin shutdown;
  call this script).
mysql-test/lib/mtr_process.pl:
  * Through the "expect" file a test can tell mtr that a server crash
  is expected. What the file contains is irrelevant. Now if its last
  line starts with "wait", mtr will wait before restarting (it will
  wait for the last line to not start with "wait"). This is for
  tests which need to mangle files under the feet of a dead mysqld.
  * Remove "expect" file before restarting; otherwise there could be a
  race condition: tests sees server restarted, does something, writes
  an "expect" file, and then mtr removes that file, then
  test kills mysqld, and then mtr will never restart it.
storage/maria/ma_blockrec.c:
  - when applying a REDO in recovery, we don't anymore put UNDO's LSN on the page
  at once; indeed if in this REDO's group there comes another REDO
  for the same page it would be wrongly skipped. Instead, we keep
  pages pinned, don't change their LSN. When done with all REDOs
  of the group we unpin them and stamp them with UNDO's LSN.
  - fixing bug in applying of REDO_PURGE_BLOCKS in recovery: page_range
  sometimes has TAIL_BIT set, need to turn it down to know the real page
  range.
  - Both bugs are covered in maria-recovery.test
storage/maria/ma_checkpoint.c:
  Capability to, in debug builds only, do some special operations
  (flush all bitmap and data pages, flush state, flush log)
  and crash mysqld, to later test recovery.
   Driven by some --debug=d, symbols.
storage/maria/ma_open.c:
  debugging info
storage/maria/ma_pagecache.c:
  Now that we can _ma_unpin_all_pages() during the REDO phase
  to set page's LSN, the assertion needs to be relaxed.
storage/maria/ma_recovery.c:
  - open trace file in append mode (useful when a test triggers several
  recoveries, we see them all).
  - fixing wrong error detection, it's possible that during recovery
  we want to open an already open table.
  - when applying a REDO in recovery, we don't anymore put UNDO's LSN on the page
  at once; indeed if in this REDO's group there comes another REDO
  for the same page it would be wrongly skipped. Instead, we keep
  pages pinned, don't change their LSN. When done with all REDOs
  of the group we unpin them and stamp them with UNDO's LSN.
  - we verify that all log records of a group are about the same table,
  for debugging.
mysql-test/r/maria-recovery.result:
  result
mysql-test/t/maria-recovery-master.opt:
  crash is expected, core file would take room, stack trace would
  wake pushbuild up.
mysql-test/t/maria-recovery.test:
  Test of recovery from mysql-test (it is already tested as unit tests
  in ma_test_recovery) (WL#4137)
  - test that, if recovery is made to start on an empty table it can
  replay the effects of committed and uncommitted statements (having only
  the committed ones in the end result). This should be the first test
  for someone writing code of new REDOs.
  - test that, if mysqld is crashed and recovery runs we have only
  committed statements in the end result. Crashes are done in different
  ways: flush nothing (so, uncommitted statement is often missing
  from the log => no rollback to do); flush pagecache (implicitely flushes
  log (WAL)) and flush log, both causes rollbacks; flush log can also
  flush state (state.records etc) to test recovery of the state
  (not tested well now as we repair the index anyway).
  - test of bug found by Jani and Monty in recovery (two REDO about
  the same page in one group).
mysql-test/include/maria_empty_logs.inc:
  removes logs, to have a clean sheet for testing recovery.
mysql-test/include/maria_make_snapshot.inc:
  copies a table to another directory, or back, or compares both
  (comparison is not implemented as physical comparison is impossible
  if an UNDO phase happened).
mysql-test/include/maria_make_snapshot_for_comparison.inc:
  copies tables to another directory so that they can later
  serve as a comparison reference (they are the good tables,
  recovery should produce similar ones).
mysql-test/include/maria_make_snapshot_for_feeding_recovery.inc:
  When we want to force recovery to start on old tables, we prepare
  old tables with this script: we put them in a spare directory.
  They are later copied back over mysqltest tables while mysqld is dead.
  We also need to copy back the control file, otherwise mysqld,
  in recovery, would start from the latest checkpoint: latest
  checkpoint plus old tables is not a recovery-possible scenario of course.
mysql-test/include/maria_verify_recovery.inc:
  causes mysqld to crash, restores old tables if requested,
  lets recovery run, compares resulting tables with reference tables
  by using CHECKSUM TABLE.
  We don't do any sanity checks on page's LSN in resulting tables, yet.

Fixing bad comments (I remember my maths' teacher "one late night you'll
obey to the simplifications made by your tired neurons"; exactly
what happened here). In Checkpoint, when we flush a table's state
we must flush all log records (WAL), not only those before checkpoint
started.


storage/maria/ma_bitmap.c:
  there was a flaw in reasoning, bug does exist.
storage/maria/ma_blockrec.c:
  moving piece of comment to ma_checkpoint.c
storage/maria/ma_checkpoint.c:
  Comments.
  When checkpoint flushes a state, WAL imposes that all records up
  to this state have been flushed, not only up to checkpoint_start_log_horizon.
storage/maria/ma_recovery.c:
  finishing comment.

Observe WAL for the table's state: all log records needed for undoing
uncommitted state must be in the log before we flush state.


storage/maria/ha_maria.cc:
  comments
storage/maria/ma_bitmap.c:
  Comment for why there is no bug
storage/maria/ma_blockrec.c:
  comment for why there is no bug
storage/maria/ma_checkpoint.c:
  Observe WAL for the table's state: all log records needed for undoing
  uncommitted state must be in the log before we flush state. I tested
  by hand that the bug existed (create table, insert one row into it
  but let that insert pause after increasing data_file_length, let
  checkpoint start but kill it after it has flushed state).
  Log contains nothing, table is not recovered though it has
  a too big data_file_length. With this bugfix, the log contains
  REDO so table is opened so data_file_length is corrected.
storage/maria/ma_close.c:
  If table is read-only we must never write to it.
  Should be a no-change in fact, as if read-only, share->changed is
  normally always false.
storage/maria/ma_recovery.c:
  documenting bug found by Monty. Print when fixing data_file_length.

storage/maria/ma_loghandler.c:
  Infinite loop in case of given address more then last LSN fixed
  (now it means just flush all log).
  Removed unneeded ASSERT.
storage/maria/unittest/ma_test_loghandler-t.c:
  The test case of flushing all log added.

storage/maria/ma_pagecache.c:
  Support of rec_lsn added to pagecache_write call.
  A function for setting rec_lsn made.

don't take a checkpoint at end of REDO phase because blocks' rec_lsn
are not set. Fixes some assertion failures during tests of killing
the UNDO phase (recovery then started from the end-of-REDO-phase
checkpoint, wrongly ignoring REDOs before that record).


storage/maria/ma_blockrec.c:
  note for a bug (mail sent to colleagues, put on todo)
storage/maria/ma_recovery.c:
  this checkpoint at end of REDO phase is incorrect, disabling it.
  The one at end of UNDO phase remains.

into  gbichot4.local:/home/mysql_src/mysql-maria-for-undo-phase

- serializing calls to flush_pagecache_blocks_int() on the same file
to avoid known concurrency bugs
- having that, we can now enable the background thread, as the
flushes it does are now supposedly safe in concurrent situations.
- new type of flush FLUSH_KEEP_LAZY: when the background checkpoint
thread is flushing a packet of dirty pages between two checkpoints,
it uses this flush type, indeed if a file is already being flushed
by another thread it's smarter to move on to the next file than wait.
- maria_checkpoint_frequency renamed to maria_checkpoint_interval.


include/my_sys.h:
  new type of flushing for the page cache: FLUSH_KEEP_LAZY
mysql-test/r/maria.result:
  result update
mysys/mf_keycache.c:
  indentation. No FLUSH_KEEP_LAZY support in key cache.
storage/maria/ha_maria.cc:
  maria_checkpoint_frequency was somehow a hidden part of the
  Checkpoint API and that was not good. Now we have checkpoint_interval,
  local to ha_maria.cc, which serves as container for the user-visible
  maria_checkpoint_interval global variable; setting it calls
  update_checkpoint_interval which passes the new value to
  ma_checkpoint_init(). There is no hiding anymore.
  By default, enable background thread which does checkpoints
  every 30 seconds, and dirty page flush in between. That thread takes
  a checkpoint when it ends, so no need for maria_hton_panic to take one.
  The | is | and not ||, because maria_panic() must always be called.
  frequency->interval.
storage/maria/ma_checkpoint.c:
  Use FLUSH_KEEP_LAZY for background thread when it flushes packets of
  dirty pages between two checkpoints: it is smarter to move on to
  the next file than wait for it to have been completely flushed, which
  may take long.
  Comments about flush concurrency bugs moved from ma_pagecache.c.
  Removing out-of-date comment.
  frequency->interval.
  create_background_thread -> (interval>0).
  In ma_checkpoint_background(), some variables need to be preserved
  between iterations.
storage/maria/ma_checkpoint.h:
  new prototype
storage/maria/ma_pagecache.c:
  - concurrent calls of flush_pagecache_blocks_int() on the same file
  cause bugs (see @note in that function); we fix them by serializing
  in this situation. For that we use a global hash of (file, wqueue).
  When flush_pagecache_blocks_int() starts it looks into the hash,
  using the file as key. If not found, it inserts (file,wqueue) into the
  hash, flushes the file, and finally removes itself from the hash and
  wakes up any waiter in the queue. If found, it adds itself to the
  wqueue and waits.
  - As a by-product, we can remove changed_blocks_is_incomplete
  and replace it by scanning the hash, replace the sleep() by a queue wait.
  - new type of flush FLUSH_KEEP_LAZY: when flushing a file, if it's
  already being flushed by another thread (even partially), return
  immediately.
storage/maria/ma_pagecache.h:
  In pagecache, a hash of files currently being flushed (i.e. there
  is a call to flush_pagecache_blocks_int() for them).
storage/maria/ma_recovery.c:
  new prototype
storage/maria/ma_test1.c:
  new prototype
storage/maria/ma_test2.c:
  new prototype

    always process uint/ulong using ulonglong (unsigned) code
    dbug printout for adjusted option values
strings/llstr.c
    ullstr() - the unsigned brother of llstr()


include/m_string.h:
  ullstr() - the unsigned brother of llstr()
mysql-test/t/variables.test:
  test adjusted for 32bit
mysys/my_getopt.c:
  always process uint/ulong using ulonglong (unsigned) code
  dbug printout for adjusted option values
strings/llstr.c:
  ullstr() - the unsigned brother of llstr()

into  gbichot4.local:/home/mysql_src/mysql-maria-tmp

storage/maria/ma_loghandler.c:
  applying patch for bugfix, by Sanja.

into  gbichot4.local:/home/mysql_src/mysql-maria-for-undo-phase


storage/maria/ma_recovery.c:
  Auto merged

Ability for flush_pagecache_blocks() to flush only certain pages of
a file, as instructed by an option "filter" pointer-to-function argument;
Checkpoint and background dirty page flushing use that to flush only
pages which have been dirty for long enough and bitmap pages.
Fix for a bug in flush_cached_blocks() (no idea if it could produce
a bug in real life, but theoretically it is).
Testing checkpoint in ma_test_recovery via ma_test1 and ma_test2.
Background checkpoint & dirty pages flush thread is still disabled
by default in ha_maria.


mysql-test/r/maria.result:
  result update
storage/maria/ha_maria.cc:
  blank after function comment
storage/maria/ma_checkpoint.c:
  Using an enum instead of 0/1/2 (applying Sanja's review comments).
  The comment about "this is an horizon" can be removed as Sanja
  created translog_next_LSN() which parse_checkpoint_record() uses.
  Variables in ma_checkpoint_background() cannot be declared in the
  for() as their value must not be reset at each iteration!
storage/maria/ma_pagecache.c:
  adding to flush_pagecache_blocks() optional arguments 'filter'
  (pointer to function) and 'filter_arg'; if filter!=NULL this function
  will be called for each block of the file and will reply if this
  block and following ones should be flushed or not (3 possible
  replies).
  Fixing a bug when flush_cached_blocks() skips a pinned page: it has
  to unset PCBLOCK_IN_FLUSH set by flush_pagecache_blocks_int().
storage/maria/ma_pagecache.h:
  flush_pagecache_blocks() is changed to take "filter" and "filter_arg"
  arguments. "filter", if it is not NULL, may return one value
  among enum pagecache_flush_filter_result.
storage/maria/ma_recovery.c:
  open_count=0 when closing tables at the end of recovery.
storage/maria/ma_test1.c:
  Optional checkpoints (-H#) at various stages (stages similar
  to --testflag), for testing of checkpoints.
storage/maria/ma_test2.c:
  Optional checkpoints (-H#) at various stages (stages similar
  to -t), for testing of checkpoints.
storage/maria/ma_test_recovery.expected:
  Result update: the results of the additional test run with -H#
  (checkpoints) are added here. They are exactly identical to without
  checkpoints except that the index's Root (printed by maria_chk)
  is more correct when using checkpoints. This is because checkpoint
  flushed the state, so it happens to be correct, while no-checkpoint
  does not flush the state, and recovery does not recover indexes
  so Root is never fixed. When we recover indices, this will go away.
storage/maria/ma_test_recovery:
  We duplicate the loop of tests to add an additional run with
  checkpoints at various stages, to see if maria_read_log
  uses them fine.

into  desktop.sanja.is.com.ua:/home/bell/mysql/bk/work-maria-bug


storage/maria/ma_recovery.c:
  Auto merged

  on the loghandler start.
Variable definition moved because it is C programm.


storage/maria/ma_loghandler.c:
  Checking that the very last record is fully written
    on the loghandler start.
storage/maria/ma_recovery.c:
  Variable definition moved because it is C programm.

storage/maria/ma_delete_all.c:
  comment (@todo gone, nothing we can do)
storage/maria/ma_recovery.c:
  - fail if LOGREC_CREATE_TABLE contains some symlink info (that
  will be handled in a future version)
  - don't do buffer overrun when parsing a REDO record
  - out-of-date @todo

into  gbichot4.local:/home/mysql_src/mysql-maria-tmp

- fixes (in recovery, checkpoint, log handler) of bugs found
during testing.
- new option --check for maria_read_log: with --only-display (which only
reads the header) it reads the full record, for debugging.


storage/maria/ma_loghandler.c:
  importing patch from Sanja for bug of translog_next_LSN() found
  during recovery
storage/maria/ma_loghandler_lsn.h:
  better types (0L is 4 bytes on some platforms, it causes problems
  when used into lsn_store(): right shift >= width of type.
storage/maria/ma_pagecache.c:
  work around infamous "PAGECACHE_PLAIN_PAGE used for transactional
  tables in specialm case"; REDO phase disables logging and this causes
  pages to be PAGECACHE_PLAIN_PAGE, thus ignored wrongly by the
  checkpoint taken at the end of the REDO phase.
storage/maria/ma_recovery.c:
  - a #ifdef which broke maria_read_log in non-debug builds (no output!)
  - support for maria_read_log --check
  - detect record corruption before opening the table
  - updating is_of_horizon requires writing the state
  - fix for wrong parsing of checkpoint record by recovery
storage/maria/ma_recovery.h:
  support for maria_read_log --check
storage/maria/maria_read_log.c:
  Option --check: --only-display only looks at the header;
  adding --check tries a translog_read_record() to see if record can
  be fully read (this is to find bugs).

  bugfixes


dbug/dbug_add_tags.pl:
  bugfixes

client/mysqltest.c:
  fix my_option's with incorrect defaults
mysql-test/r/maria.result:
  update results
mysql-test/t/variables.test:
  update results
sql/mysqld.cc:
  fix my_option's with incorrect defaults

1. available_stack_size() was getting the direction wrong,
   so alloca() was never used
2. (char*) casts added to kill "break strict-aliasing rules" warnings
3. s/node/node=0/ to kill "pointer casted to integer" warning
4. added volatiles as appropriate to prevent gcc from moving
   assignment out of the loop


mysys/lf_alloc-pin.c:
  bugs/warnings fixed:
  1. available_stack_size() was getting the direction wrong,
     so alloca() was never used
  2. (char*) casts added to kill "break strict-aliasing rules" warnings
  3. s/node/node=0/ to kill "pointer casted to integer" warning
  4. added volatiles as appropriate to prevent gcc from moving
     assignment out of the loop

into  janus.mylan:/usr/home/serg/Abk/mysql-maria

mysql-test/r/maria.result:
  test for maria variables
mysql-test/t/maria.test:
  test for maria variables
BitKeeper/etc/ignore:
  Added sql/link_sources ylwrap libmysql_r/link_sources to the ignore list
sql/sql_delete.cc:
  fix incorrect check
storage/maria/ha_maria.cc:
  maria status and pagecache variables

Mutex owner checks added.

  which can happen when you save address of horizon

into  desktop.sanja.is.com.ua:/home/bell/mysql/bk/work-maria-filler

Added ability top change empty space filler of the loghandler.
Fixed end of log reaction.
Fixed memory corruprion bug caused by reading non-filled hage header.
Added debug output.


storage/maria/ma_bitmap.c:
  Compiler warnings removed.
storage/maria/ma_blockrec.c:
  Compiler warnings removed.
storage/maria/ma_loghandler.c:
  Added ability top change empty space filler of the loghandler.
  Fixed end of log reaction.
  Fixed memory corruprion bug caused by reading non-filled hage header.
  Added debug output.
storage/maria/ma_loghandler_lsn.h:
  Compiler warnings removed.

storage/maria/ma_recovery.c:
  bugfix ("count" is meaningul only if printing messages)

plus printing a downcount of tables to flush).


storage/maria/ma_recovery.c:
  improving the progress message of recovery; it used to assume that
  if there is a non-zero UNDO phase then there was a non-REDO phase,
  and if there are tables to flush there was an UNDO phase,
  which is not always true. We now print a downcount of tables to flush
  (4 3 2 1 0).

* Preparation for having a background checkpoint thread:
frequency of checkpoint taken by that thread is now configurable
by the user: global variable maria_checkpoint_frequency, in seconds,
default 30 (checkpoint every 30th second); 0 means no checkpoints
(and thus no background thread, thus no background flushing, that
will probably only be used for testing).
* Don't take checkpoints in Recovery if it didn't do anything
significant; thus no checkpoint after a clean shutdown/restart. The
only checkpoint which is never skipped is the one at shutdown.
* fix for a test failure (after-merge fix)


include/maria.h:
  new variable
mysql-test/suite/rpl/r/rpl_row_flsh_tbls.result:
  result update
mysql-test/suite/rpl/t/rpl_row_flsh_tbls.test:
  position update (=after merge fix, as this position was already changed
  into 5.1 and not merged here, causing test to fail)
storage/maria/ha_maria.cc:
  Checkpoint's frequency is now configurable by the user:
  global variable maria_checkpoint_frequency. Changing it on the fly
  requires us to shutdown/restart the background checkpoint thread,
  as the loop done in that thread assumes a constant checkpoint
  interval. Default value is 30: a checkpoint every 30 seconds (yes, I
  know, physicists will remind that it should be named "period" then).
  ha_maria now asks for a background checkpoint thread when it starts,
  but this is still overruled (disabled) in ma_checkpoint_init().
storage/maria/ma_checkpoint.c:
  Checkpoint's frequency is now configurable by the user: background thread
  takes a checkpoint every maria_checkpoint_interval-th second.
  If that variable is 0, no checkpoints are taken.
  Note, I will enable the background thread only in a later changeset.
storage/maria/ma_recovery.c:
  Don't take checkpoints at the end of the REDO phase and at the end of
  Recovery if Recovery didn't make anything significant (didn't open
  any tables, didn't rollback any transactions).
  With this, after a clean shutdown, Recovery shouldn't take any
  checkpoint, which makes starting faster (we save a few fsync()s of
  the log and control file).

into  gbichot4.local:/home/mysql_src/mysql-maria-tmp


storage/maria/ma_loghandler.c:
  Auto merged

into  desktop.sanja.is.com.ua:/home/bell/mysql/bk/work-maria-bug

into  janus.mylan:/usr/home/serg/Abk/mysql-maria1

into  janus.mylan:/usr/home/serg/Abk/mysql-maria1


Makefile.am:
  Auto merged
client/mysqldump.c:
  Auto merged
configure.in:
  Auto merged
libmysqld/Makefile.am:
  Auto merged
mysql-test/mysql-test-run.pl:
  Auto merged
mysql-test/r/mysqldump.result:
  Auto merged
mysql-test/t/disabled.def:
  Auto merged
mysql-test/t/mysqldump.test:
  Auto merged
mysys/mf_tempfile.c:
  Auto merged
sql/Makefile.am:
  Auto merged
sql/ha_partition.cc:
  Auto merged
sql/ha_partition.h:
  Auto merged
sql/handler.cc:
  Auto merged
sql/lock.cc:
  Auto merged
sql/sql_parse.cc:
  Auto merged
sql/sql_plugin.cc:
  Auto merged
sql/sql_select.cc:
  Auto merged
sql/sql_table.cc:
  Auto merged
sql/table.cc:
  Auto merged
sql/table.h:
  Auto merged
BUILD/compile-dist:
  SCCS merged

  fixed uninit memory access in SET pluginvar=DEFAULT
innodb_mysql.test, innodb_mysql.result:
  test case for SET pluginvar=DEFAULT


mysql-test/r/innodb_mysql.result:
  test case for SET pluginvar=DEFAULT
mysql-test/t/innodb_mysql.test:
  test case for SET pluginvar=DEFAULT
sql/sql_plugin.cc:
  fixed uninit memory access in SET pluginvar=DEFAULT