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    • Julien Muchembled's avatar
      Safer DB truncation, new 'truncate' ctl command · d3c8b76d
      Julien Muchembled authored 
      With the previous commit, the request to truncate the DB was not stored
persistently, which means that this operation was still vulnerable to the case
where the master is restarted after some nodes, but not all, have already
truncated. The master didn't have the information to fix this and the result
was a DB partially truncated.

-> On a Truncate packet, a storage node only stores the tid somewhere, to send
   it back to the master, which stays in RECOVERING state as long as any node
   has a different value than that of the node with the latest partition table.

We also want to make sure that there is no unfinished data, because a user may
truncate at a tid higher than a locked one.

-> Truncation is now effective at the end on the VERIFYING phase, just before
   returning the last ids to the master.

At last all nodes should be truncated, to avoid that an offline node comes back
with a different history. Currently, this would not be an issue since
replication is always restart from the beginning, but later we'd like they
remember where they stopped to replicate.

-> If a truncation is requested, the master waits for all nodes to be pending,
   even if it was previously started (the user can still force the cluster to
   start with neoctl). And any lost node during verification also causes the
   master to go back to recovery.

Obviously, the protocol has been changed to split the LastIDs packet and
introduce a new Recovery, since it does not make sense anymore to ask last ids
during recovery.
      d3c8b76d
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  21. 27 Apr, 2011 1 commit
    • Julien Muchembled's avatar
      connection: make close always call handler (connectionClosed or connectionFailed) · 4b6c1387
      Julien Muchembled authored 
      Main reason is that it's difficult to know in advance which side really closes
the connection. Network events can be chaotic and this could lead to many race
conditions.
Thus, handler can be used to update any database that is somewhat redundant
to the connection status, i.e. node status usually. Safely and less duplicated
code.

This change is motivated by recurrent random failures during election.
An example of race condition was that 2 fully connected master could close the
extra connection (the primary -> secondary one) at the same time.

In order to stabilize lower-level code and start with reliable election process,
code has also been simplified to not care about node states. All connections
without exception are closed at the end of the election and states are then
updated 1 by 1 by identification handler.
Note that during election, there may be 2 connection per node, which makes
difficult to update node states by connectionFailed/connectionClosed events.

timeoutExpired & peerBroken are dropped as they are unused for the moment.
A new API should be designed so that connectionClosed know the reason of the
close.
BROKEN state becomes unused.

git-svn-id: https://svn.erp5.org/repos/neo/trunk@2732 71dcc9de-d417-0410-9af5-da40c76e7ee4
      4b6c1387
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