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version. The client version is different enough that this is
worthwhile
- enable local shortcut for client version of ctdb_call
- add idr_find_type(), with better error reporting in case of type
mismatch
(This used to be ctdb commit 2388094c5f7b6ce003e86b05620c06217d63b49c)
us to put memory directly in the right context, avoiding quite a few
talloc_steal calls, and simplifying the code
- make the fetch lock code in the daemon fully async
(This used to be ctdb commit d98b4b4fcadad614861c0d44a3854d97b01d0f74)
remove the parameter from the ctdbd script
remove the store_unlock from ctdbd_test since there is no and will be no pdu for this
CTDB_REPLY_FETCH_LOCK no longer return the data for the record since the client is assumed to read this itself from the local tdb. remove some variables that no longer exists.
(This used to be ctdb commit 77c43479e1932b27387fc2f85a3cb6538633b481)
a client held the chainlock, and the daemon received a dmaster reply
at the same time. The daemon would not be able to process the dmaster
reply, due to the lock, but the fetch lock cannot make progres until
the dmaster reply is processed.
The solution is to not hold the lock in the client while talking to
the daemon. The client has to retry the lock after the record has
migrated. This means that forward progress is not guaranteed. We'll
have to see if that matters in practice.
(This used to be ctdb commit 737e5a1253cb048222c595a474aff71c99fc554f)
It ensures that when the client context goes away (such as when the client exits)
that any timed events and partially completed requests from that client also go away
(This used to be ctdb commit 45a45a0a44d4da9b45719aac72b0ae4bd4c74462)
occasionally leads to problems if an immediate send on the socket
causes a context switch and the client exiting before the daemon. We
now exit the client when the daemon goes away.
(This used to be ctdb commit b7bed0088e700f25105ceea63640b38804f51e4d)
this function can be used in test applications to perform an orderly shutdown of the ctdb cluster once the test has completed.
the ctdb nodes will remain operational until all of them have received a shutdown from their client(s) after which the ctdb daemons will all terminate.
this eliminates the need to using sleep() in some of the test applications
(This used to be ctdb commit f35db69dc190b11659aad85495bb66308fdb5599)
- fixed memory leaks in the 3 packet receive routines. The problem was
that the ctdb_call logic would occasionally complete and free a
incoming packet, which would then be freed again in the packet
receive routine. The solution is to make the packet a child of a
temporary context in the receive routine then free that temporary
context. That allows other routines to keep or free the packet if
they want to, while allowing us to safely free it (via a free of the
temporary context) in the receive function
(This used to be ctdb commit 304aaaa7235febbe97ff9ecb43875b7265ac48cd)
fetch, to avoid the daemon re-reading it
- suffix the database name with the node name so that testing on
loopback doesn't result in a name collision in the database open
(This used to be ctdb commit ad30a4db75450643ff146c40faa306a021de3dd2)
code. It may be added back later once everything is working nicely,
or simulated using a in-process pipe instead of a unix domain socket
- rewrote the ctdb_fetch_lock() code to follow the new design
(This used to be ctdb commit 5024dd1f305fe1ecc262db2240c56f773b4f28f0)
change ctdb_client_fetch_lock to return a status code instead of a record handle and make it unconditionally fill in data.
change ctdb_client_store_unlock to take ctdb_db and key as arguments instead of a record handle
update the ctdb_fetch.c test to use the clientside helpers for fetching and storing data
(This used to be ctdb commit 22d5d40375e0135916c97945646f94119612615d)
this will be the core of the non-blocking lock idea for ctdb, it will be used
in place of ctdb_ltdb_fetch(), but will also get a lock. It re-starts a request
if it needs to block
(This used to be ctdb commit afa479026cf6293e6a878c8a329cdac035284672)
The problem we have is this:
- we want the client smbd processes to be able to 'shortcut' access
to the ltdb, by directly accessing the ltdb, and if the header of
the record shows we are the dmaster then process immediately, with
no overhead of talking across the unix domain socket
- a client doing a shortcut will use tdb_chainlock() to lock the
record while processing
- we want the main ctdb daemon to be able to set locks on the
record, and when those locks collide with a 'shortcut' fcntl lock,
we want the ctdb daemon to keep processing other operations
- we don't want to have to send a message from a smbd client to the
ctdbd each time it releases a lock
The solution is shown in this example. Note that the expensive fork()
and blocking lock is only paid in case of contention, so in the median
case I think this is zero cost.
(This used to be ctdb commit a3248c3e2b740cd2403acffd3c1f6a33dca0ea03)
- when we do a store_unlock the lock record becomes unlocked, so we
must destroy it (or we leak memory)
(This used to be ctdb commit d85955640e670dd580073da96b25fb8a10c08d18)
they both successfully fetch and lock the same record at this stage but when the actual locking works properly the second child will block.
this test allows us to verify the blocking once we have implemented it
(This used to be ctdb commit b1c0baa03a669757aaacb6e1a2794224f5ba2cd7)
there is still a bug in the ctdb code in that the children no longer receive messages from the parent for unknown reasons
(This used to be ctdb commit 468f68e4607900c5c38aea428a48dd6ea1647411)
this makes it possible to do fetch_lock and store_unlock across a domain socket to read/write data.
note that the actual locking is NOT implemented yet
(This used to be ctdb commit c7a397c56caf71283c081e5b97620085ed5108c6)
for now:
fetch a record
store a known entry for this record
fetch the record again (and later verify we got the same record)
store it back again
this will not work right now since we dont yet store the record inside the daemon
(This used to be ctdb commit f502094499a3c25ab58aa3d192588b5e6dd2b8e4)
note that the store_unlock does not actually do anything yet apart from passing the pdu from client to daemon and daemon responds.
next is to make sure the daemon actually stores the data in a database
(This used to be ctdb commit 167d6993e78f6a1d0f6607ef66925a14993ae6a1)
right now this test only does one fetch lock but this will be enhanced as more code is added to ctdb to handle fetch_lock and store_unlock
(This used to be ctdb commit 996f117d9181dee22aea979ce04333035f5522c7)
we cant peek in state->c since this is uninitialized
and even if it were not it would be wrong
create a new structure to pass BOTH client and also the reqid to respond back to
the client with
(This used to be ctdb commit e1a0da3dfbb4a927e8d98723b5e51a201c2a3428)
no locking is yet done and the store_unlock call is still missing
the ./tests/fetch.sh --daemon test fails with parent process dying which needs to be investigated.
(This used to be ctdb commit 7d7141c968950a8856f1be79871932b688bfb07f)
