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The previous commit contained a regression that would trigger a crash
when attempting to add an index to an Mnesia table of type ordered_set.
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ETS bag tables have very poor performance on insertion if you have lots
of rows with duplicate keys, since it has to check each existing record
and make sure it's not inserting any duplicates. This can lead to some
pretty drastic slowdowns when inserting lots of rows into an Mnesia
table, IF you're introducing lots of duplicate values into an indexed
column.
As it turns out, we can fix this by switching to duplicate_bag tables
for storing Mnesia indexes on tables of type 'set', and it ultimately
makes no functional difference since we will never actually attempt to
insert any duplicate records anyway. (We would have to make some bigger
changes to make this work for Mnesia bag tables though, so that is left
as a possible enhancement for the future.)
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If mnesia:cleartable/1 was called during a table_load an schema event
with delete and write of that table is sent, which caused the table
to contain the schema record instead of clearing the table.
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* lh/forget-mnemosyne/OTP-10729:
Remove what remains of the Mnemosyne code
Remove support for the query keyword and query expressions
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* nox/enable-silent-rules/OTP-10726:
Implement ./otp_build configure --enable-silent-rules
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With silent rules, the output of make is less verbose and compilation
warnings are easier to spot. Silent rules are disabled by default and
can be disabled or enabled at will by make V=0 and make V=1.
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* ao/fix_mnesia_overload_msg_format:
Fix format of mnesia overload message
OTP-10639
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Using ~p in mnesia overload message could lead to wrong messages.
mnesia_tm overload message contains a list of two numbers (queue length)
example:
instead of:
Mnesia is overloaded: {mnesia_tm,message_queue_len,[100,105]}
it prints :
Mnesia is overloaded: {mnesia_tm,message_queue_len,"di"}
Replacing ~p with ~w fixes the problem as it doesn't try
to detect lists of printable characters
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timer:send_interval behaves badly when resuming from sleep on some
platforms. For example, if I sleep for 10 minutes, and have a
send_interval running once per minute, when I resume, 10 messages
will be sent immediately, eliminating the benefit of only running
the work periodically. This is admittedly a separate bug with
send_interval, but the workaround is straightforward, and also
protects from messages piling up in the queue when the work takes
longer than the interval.
This patch fixes piled up error reports on resume from sleep:
** WARNING ** Mnesia is overloaded: {dump_log, write_threshold}
You'll still be warned if mnesia is overloaded, just not repeatedly.
Additionally, erlang:send_after is more efficient than using the
timer module equivalent [1]
[1] http://www.erlang.org/doc/efficiency_guide/commoncaveats.html#id57251
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We have to ensure that we actually delete the last object with a
given (key, index) pair before removing the index.
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OTP-10106
OTP-10107
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* ud/fix-return-do_get_disc_copy2:
Fixes value returned by mnesia_loader:do_get_disc_copy2/4
OTP-10015
OTP-10016
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If a transaction releases a write, it can be deleted directly since no read locks
or other write locks can be present
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5% faster on tpcb
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Switch to ordered_set so match_object matches partially bound keys,
more efficient.
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Returns the same value for `mnesia_loader:disc_load_table/2' as
`mnesia_loader:net_load_table/4' if a table copy can not be found.
This patch was stuck as a pull request in GitHub (authored by Uwe
Dauernheim):
https://github.com/erlang/otp/pull/16
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* dgud/mnesia/read-sticky-bug/OTP-9786:
[mnesia] Read record from correct node
[mnesia] Fixed sticky read lock bug
[mnesia] Whitespace fixes
Conflicts:
lib/mnesia/src/mnesia_log.erl
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* rc/mnesia_log-no-async:
Use the synchronous log_terms instead of alog_terms in mnesia_log:ets2dcd()
OTP-9804
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This avoids the situation where mnesia could dump a very large ets table in
its entirety into the message queue of the disk_log process, causing memory
blowup and choking the disk logger.
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Read from where_to_read otherwise bad data may read during
move_table, where where_to_write is updated before where_to_read
and the table is available.
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wread on locks stuck at non-local node could return unexpected value.
Thanks to Magnus Henoch who posted a nice testcase showing the bug.
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create_table
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* pr/mnesia_frag_hash:
add mnesia_frag_hash test
Reduce calls to phash in key_to_frag_number
OTP-9722
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Allow schema operation even if not all nodes are upgraded to
latest version.
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Aviods failing/wobbling testcase. Mnesia mishandled supervisors.
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* dgud/mnesia/leaking-log/OTP-9551:
[mnesia] Use api to log decisions.
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Mainly to correctly clear dets tables. It may also be faster to use
the dedicated functions.
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Instead of just appending decisions to the log, use mnesia_log:log(Decision),
it will increment the counter which causes the log to be dumped even
if no actual commits are stored on this node.
This fixed a bug where the LATEST.log would grow forever on a node which
had the schema on disc, but where not involved in any commits.
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And remove old protocol version hacks
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The do_merge_schema function now converts cstructs from a remote node
when it detects that they are different. In order to be compatible the
other way around, mnesia_controller:get_cstructs() detects a remote caller,
and converts the cstructs before sending them.
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