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make erlang:process_info/1 not retrieve messages
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process_info/1 retrieves a number of properties related to a process,
including the list of messages in its mailbox. This is potentially
unsafe if the target process has a large number of queued messages:
- there is no a priori upper bound on the amount of memory being
allocated to hold that list, and
- the loop to retrieve the messages is uninterruptible, so the
Erlang scheduler where this executes blocks for the duration
We've seen process_info/1 bring down heavily loaded nodes on more
than one occasion. At least once it appeared to have blocked the
Erlang heart process from executing, causing the external heart to
kill the VM.
Consequently this removes 'messages' from the list of process_info
tags to retrieve for process_info/1. Note that process_info/1 still
retrieves 'message_queue_len', and process_info/2 can still retrieve
'messages' when asked to.
A few places in the OTP libraries need minor adjustments, since they
want 'message_queue_len' but compute it from the length of the list
of messages.
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Take care of the call of erlang:get_stacktrace() in
module mnesia_lib.
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The remaining call (in module mnesia_lib) is taken care
of in the following commit.
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* maint:
Updated OTP version
Prepare release
mnesia: Fix checkpoint crash
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* dgud/mnesia/checkpoint-crash/OTP-14841:
mnesia: Fix checkpoint crash
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* dgud/mnesia/slow-startup/OTP-14829:
mnesia: Read schema user properties directly
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Bad timing can cause retain messages to go to a new process if
checkpoint name is reused directly and the checkpoints contain
different tables.
Ignore those messages instead of crash.
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* maint:
Updated OTP version
Prepare release
mnesia: Read schema user properties directly
ssh: testcases for space trailing Hello msg
ssh: Don't remove trailing WS in Hello msg
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* maint-19:
Updated OTP version
Prepare release
mnesia: Read schema user properties directly
ssh: testcases for space trailing Hello msg
ssh: Don't remove trailing WS in Hello msg
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* dgud/mnesia/slow-startup/OTP-14829:
mnesia: Read schema user properties directly
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Doing a proper transaction handling of user properties (in current
implmenentation) caused schema_transactions to be quadratic which
caused huge startup times for nodes with many tables since the merge schema
is a schema_transaction.
Do a direct read instead, cheap but implies that the plugin changes
will not be visible until the changes are commited and cannot be used
later in same transaction, which was possible before if undocumented
functions where used.
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* maint:
mnesia: Fix error handling in abort write
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* dgud/mnesia/backup-error-handling/OTP-14776:
mnesia: Fix error handling in abort write
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* maint:
Fix type create_option() in mnesia
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The create_option() type in mnesia lacks the user_properties field
which is used by mnesia in various places.
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The "root cause" error reason was lost when abort_write failed,
e.g. file was already closed, and Mod:abort_write(..) returned an
error.
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~tw and new string functions are new since OTP-20 (stdlib-3.4)
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It is not used anymore, snmp indecies are now ets tables and not processes.
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Which may hang if an application start does wait for tables
during initilization.
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* maint:
Updated OTP version
Prepare release
Fixed crash when a table was deleted during checkpoint traversal
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Set fixtable false will fail on deleted tables, catch that and also
report checkpoint deactivate error, so user can see why checkpoint
was deactivated and backup fails.
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The module mnesia_frag_old_hash utilized the broken erlang:hash/2 function
which has been deprecated for a long time. Since erlang:hash/2 is now removed
there is no point in having this module any more.
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* maint:
Use off_heap memory queue for mnesia_tm
Preserve key order in mnesia:table_info
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* richcarl/mnesia/table_info_order:
Preserve key order in mnesia:table_info
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Helps when mnesia_tm gets drowned in dirty_writes from remote node.
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* dgud/mnesia/type-specs:
Add basic spec and types
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Continuations returned from mnesia_ext backends were originally wrapped with
the backend module, but that was a remnant of the earliest implementation,
and is not actually needed, since Mnesia already knows what the table
storage type is when it applies the continuation. When mnesia_ext was ported
to OTP 19, the wrapper got changed to use the table type alias instead of
the module, which triggered an error in the mnesia_eleveldb backend. This
patch removes the wrapping completely.
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To separate concerns and reduce confusion, avoid implementing two
behaviours in a single module. Make a single start_link() helper in
mnesia_sup and remove the unused mnesia_sup:start() utility function.
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* dgud/mnesia/fix-blocked/OTP-13970:
Avoid some error reports when stopping mnesia
mnesia: Fix double blocked tables which could cause a crash
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Worker processes can cause error reports if the main mnesia processes
dissapear.
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Fast restarts could cause table to be blocked twice.
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A continuation returned by mnesia:select/[14] should be reusable in
different, non-transactional activities. Aborting with
wrong_transaction doesn't make sense in a dirty context.
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When building match result patterns the tuples they must qouted
with { }, which causes a problem with variable patterns.
Use element(1, Match) instead of trying to build the two tuple.
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* dgud/mnesia/ext-backend/PR-858/OTP-13058:
mnesia_ext: Add basic backend extension tests
mnesia_ext: reuse snmp field for ext updates
mnesia_ext: Create table/data containers from mnesia monitor not temporary processes
mnesia_ext: Implement ext copies index
mnesia_ext: Load table ext
mnesia_ext: Dumper and schema changes
mnesia_ext: Refactor mnesia_schema.erl
mnesia_ext: Ext support in fragmented tables
mnesia_ext: Backup handling
mnesia_ext: Create schema functionality
mnesia_ext: Add ext copies and db_fold to low level api
mnesia_ext: Refactor record_validation code
mnesia_ext: Add create_external and increase protocol version to monitor
mnesia_ext: Add ext copies to records
mnesia_ext: Add supervisor and behaviour modules
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Minimal impact when talking to older nodes.
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processes
Tables or data containers should be owned and monitored by mnesia_monitor and
should thus be created by that process.
Always create_table before loading it
We need to create tables for ram_copies at least before loading
them as they are intermittent. It is also needed to get mnesia
monitor as the parent and supervisor of the data storage.
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Make ram_copies index always use ordered_set
And use index type as prefered type not a implementation requirement,
the standard implmentation will currently ignore the prefered type.
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