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This aske the daemon wheter a transaction is currently active on a
given DB on that node. More precisely this asks for the transaction_active
flag in the ctdb_db_context that is set in the CTDB_TRANS2_COMMIT
control and cleared in the CTDB_TRANS2_ERROR or CTDB_TRANS2_FINISHED controls.
This will be useful for fixing race conditions in the transaction code.
Michael
(This used to be ctdb commit 8d430ae6968dfe566614379436fc3c56003fcd88)
so we can spot if there are leaks.
plug two leaks for filedescriptors related to when sending ARP fail
and one leak when we can not parse the local address during tcp connection establish
(This used to be ctdb commit ddd089810a14efe4be6e1ff3eccaa604e4913c9e)
In ctdb_client.c:ctdb_transaction_commit(), after a failed
TRANS2_COMMIT control call (for instance due to the 1-second
being exceeded waiting for a busy node's reply), there is a
1-second gap between the transaction_cancel() and
replay_transaction() calls in which there is no lock on the
persistent db. And due to the lack of global state
indicating that a transaction is in progress in ctdbd, other nodes
may succeed to start transactions on the db in this gap and
even worse work on top of the possibly already pushed changes.
So the data diverges on the several nodes.
This change fixes this by introducing global state for a transaction
commit being active in the ctdb_db_context struct and in a db_id field
in the client so that a client keeps track of _which_ tdb it as
transaction commit running on. These data are set by ctdb upon
entering the trans2_commit control and they are cleared in the
trans2_error or trans2_finished controls. This makes it impossible
to start a nother transaction or migrate a record to a different
node while a transaction is active on a persistent tdb, including
the retry loop.
This approach is dead lock free and still allows recovery process
to be started in the retry-gap between cancel and replay.
Also note, that this solution does not require any change in the
client side.
This was debugged and developed together with
Stefan Metzmacher <metze@samba.org> - thanks!
Michael
(This used to be ctdb commit f88103516e5ad723062fb95fcb07a128f1069d69)
log the type of operation and the database name for all latencies higher
than a treshold
(This used to be ctdb commit 1d581dcd507e8e13d7ae085ff4d6a9f3e2aaeba5)
the difference between a initial commit attempt and a retry, which
allows us to get the persistent updates counter right for retries
(This used to be ctdb commit 7f29c50ccbc7789bfbc20bcb4b65758af9ebe6c5)
This allows ctdb to automatically start a new full blown recovery
if a client has started updating the local tdb for a persistent database
but is kill -9ed before it has ensured the update is distributed clusterwide.
(This used to be ctdb commit 1ffccb3e0b3b5bd376c5302304029af393709518)
This reverts commit bfba5c7249eff8a10a43b53c1b89dd44b625fd10.
revert the waitpid changes. we need to waitpid for some childredn so should
refactor the approach completely
(This used to be ctdb commit 702ced6c2fe569c01fe96c60d0f35a7e61506a96)
so we should not call it from the main daemon.
1, set SIGCHLD to SIG_DFL to make sure we ignore this signal
2, get rid of all waitpid() calls
3, change reporting of event script status code from _exit()/waitpid() to write()/read() one byte across the pipe.
(This used to be ctdb commit bfba5c7249eff8a10a43b53c1b89dd44b625fd10)
since these two controls (UPDATE_RECORD and PERSISTENT_STORE) can respond
asynchronously to the control, we can not allocate the state variable as a child off ctdb_req_control instead we must allocate state as a child off ctdb itself
and steal ctdb_req_control so it becomes a child of state.
othervise both ctdb_req_control and also state will be released immediately after we have finished setting up the async reply and returned.
(This used to be ctdb commit 6f6de0becd179be9eb9a6bf70562b090205ce196)
With these patches, ctdbd will enforce and (by default) always use
tdb_transactions when updating/writing records to a persistent database.
This might come with a small performance degratation since transactions
are slower than no transactions at all.
If a client, such as samba wants to use a persistent database but does NOT
want to pay the performance penalty, it can specify TDB_NOSYNC as the
srvid parameter in the ctdb_control() for CTDB_CONTROL_DB_ATTACH_PERSISTENT.
In this case CTDBD will remember that "this database is not that important"
so I can use unsafe (no transaction) tdb_stores to write the updates.
It will be faster than the default (always use transaction) but less crash safe.
(This used to be ctdb commit 3d85d2cf669686f89cacdc481eaa97aef1ba62c0)
for stores into persistent databases, ALWAYS use a lockwait child take out the lock for the record and never the daemon itself.
(This used to be ctdb commit 7fb6cf549de1b5e9ac5a3e4483c7591850ea2464)
c to prevent it from being immediately freed (and our persistent store
state with it) if we need to wait asynchronously for other nodes before
we can reply back to the client
(This used to be ctdb commit fa5915280933e4d2e7d4d07199829c9c2b87a335)
