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This helps distinguish processes in process list in top, perf, etc.
Signed-off-by: Amitay Isaacs <amitay@gmail.com>
(This used to be ctdb commit 2493f57ce268d6fe7e4c40a87852c347fd60d29e)
When ringbuffer is full, it does not return any entries. Simplify
ringbuffer logic by keeping track of number of log entries rather than
last entry.
Signed-off-by: Amitay Isaacs <amitay@gmail.com>
Pair-Programmed-With: Martin Schwenke <martin@meltin.net>
(This used to be ctdb commit 939d12b96a0cbebbe6269fa2b14f584058dd6174)
Commit a82d3ec12f0fda16d6bfa8442a07595de897c10e broke fetching from
the log ringbuffer. The solution there is still generally good: there
is no need to keep the ringbuffer in children created by
ctdb_fork()... except for those special children that are created to
fetch data from the ringbuffer!
Introduce a new function ctdb_fork_no_free_ringbuffer() that does
everything ctdb_fork() needs to do except free the ringbuffer (i.e. it
is the old ctdb_fork() function). The new ctdb_fork() function just
calls that function and then frees the ringbuffer in the child.
This means all callers of ctdb_fork() have the convenience of having
the ringbuffer freed. There are 3 special cases:
* Forking the recovery daemon. We want to be able to fetch from the
ringbuffer there.
* The ringbuffer fetching code. Change the 2 calls in this code (main
daemon, recovery daemon) to call ctdb_fork_no_free_ringbuffer()
instead.
While we're here, clear the log ringbuffer when the recovery deamon is
forked, since it will contain a copy of the messages from the main
daemon.
Note to self: always test... even the most obvious patches... ;-)
Signed-off-by: Martin Schwenke <martin@meltin.net>
(This used to be ctdb commit 00db5fa00474f8a83f1aa3b603fd756cc9b49ff4)
These support getting and clearing logs from the ring-buffer in the
recovery daemon.
Signed-off-by: Martin Schwenke <martin@meltin.net>
(This used to be ctdb commit cbca233d1e03b2410e0bb63b936328d4a8b3c7b4)
scheduler for the child.
Use ctdb_fork() from callers where we dont want the child to be running
at real-time privilege.
(This used to be ctdb commit 58795a4c9e0624e20fa3e0023b65127053edd103)
This means we can distinguish which child is logging, esp. via syslog where we have no pid.
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
(This used to be ctdb commit 68b3761a0874429b90731741f0531f76dcfbb081)
In Samba this is now called "tevent", and while we use the backwards
compatibility wrappers they don't offer EVENT_FD_AUTOCLOSE: that is now
a separate tevent_fd_set_auto_close() function.
This is based on Samba version 7f29f817fa939ef1bbb740584f09e76e2ecd5b06.
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
(This used to be ctdb commit 85e5e760cc91eb3157d3a88996ce474491646726)
ctdb_client.h is the existing internal client interface (which was mainly
in ctdb.h), and ctdb_protocol.h is the information needed for the wire
protocol only.
ctdb.h will be the new, shiny, libctdb API.
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
(This used to be ctdb commit 4bba6b8cd47b352f98d41f9f06258d5ac3c9adef)
configureable using --log-ringbuf-size=<num-entries>.
Add an entry in the sysconfig file to set this persistently.
(This used to be ctdb commit c79c2da69bc352f509e7fca4b9172a4b7f23c0f8)
in memory instead of dynamically allocated ones so that we reduce the pressure
on malloc/free.
(This used to be ctdb commit c5cbb95512f034abeec515579983bf7ac55eadd9)
