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Add stacktrace of mnesia processes.
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For performance reasons the file data is not synced to disk in mnesia,
data loss can happen between each dump.
mnesia:dump_log() can be used explicitly to ensure data is written to disk.
But that can take a long time, so mnesia:sync_log() which just
sync the log have been added.
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dirty_update_counter returned the wrong value when a subscriber existed
and no events was sent. Thanks Anton Ryabkov.
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Conflicts:
erts/etc/win32/Install.c
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Mnesia_monitor detect mnesia down using a remote process link
and net_kernel nodeup to detect that a node are reacable again.
If there is a short node communication problem.
The node-down and node-up events can happen before the
remotely linked process generates an 'EXIT'.
When node-down and node-up events are recevied they are
stored and later checked if the node came up just before
mnesia flagged the node as down.
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Bad timing could lead to hanging transactions after a mnesia down from a
node with sticky locks.
Excellent bug report from janchochol
Situation:
* node A and B have copies of table T
* node A ows sticky of table T
* node A goes down (e.g. crash)
* node B tries to perform transactional operation on table T
(e.g. mnesia:select)
In this situation there is possibility that first (and maybe other)
transaction on node B will hang indefinitely.
This is caused by race condition, when transaction process send lock
request operation to node A and waits for reply. When node A is down
it will never send reply, so process on node B will be stuck
forever.
Reason is that message sent to mnesia_locker gen_server from
mnesia_locker:mnesia_down can be received after mnesia_locker gen_server
already replies to transaction processes with {switch, N, Req} and
node N is down.
Monitoring remote process when sending request to other node should
be safe solution.
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Avoid hanging waiting for other processes on other node
to commit.
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Fixed a race where some parts of a transaction could
be added to the checkpoint.
There are probably more races here but this improves the current
testcases.
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We don't support communicating with such old nodes anyway.
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* nm/mnesia_idx_insert_speedup/OTP-11103:
Fix missing case clause for ordered_set tables
Optimize index creation for Mnesia set tables
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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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