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This is a flag that shall signa that a record has been automatically generated by ctdb
and not by an explicit client store operation. This will be used in the ctdb_ltdb_fetch
operation which stores an empty record with default initial header before trying to
migrate the record from the dmaster when the record does not exist in the local tdb.
(This used to be ctdb commit 46381a3cb58ccc11422af8f7798c80ea8d72294f)
When the record has been obtained by the lmaster as part of the vacuuming-fetch
handler and it is empty and never been migrated with data, then such records
are deleted instead of being stored. These records have automatically been
deleted when leaving the former dmaster, so that they vanish for good when
hitting the lmaster in this way. This will reduces the load on traditional
vacuuming.
Pair-Programmed-With: Stefan Metzmacher <metze@samba.org>
(This used to be ctdb commit c9b65f3602f51bcbf0e6d82c12076c31e4aebe38)
When storing a record that is being migrated off to another node
and has never been migrated with data, then we can safely delete it
from the local tdb instead of storing the record with empty data.
Note: This record is not deleted if we are its lmaster or dmaster.
Pair-Programmed-With: Stefan Metzmacher <metze@samba.org>
(This used to be ctdb commit 3cca0d4b48325d86de2cb0b44bb7811a30701352)
This is realized by adding a ctdb_ltdb_store_fn function pointer to the db
context and filling it in the attach procedure for non-persistent dbs.
(This used to be ctdb commit df49ec44de80affa5ccc637dec12a20a26e8706e)
This is supposed to contain logic for deleting records that are safe
to delete and scheduling records for deletion. It will be called in
server context for non-persistent databases instead of the standard
ctdb_ltdb_store() function.
(This used to be ctdb commit 23631ffc152486aed9ce5b69a391e52bc4947833)
This is for the control dispatcher to check whether the input data has
a required minimum size.
(This used to be ctdb commit 2038e745db33cc5c3b4e2db8a00a57ede03906a2)
So, by default we have a fastpath vacuuming every 10 seconds and
full blown db-traverse vacuuming once every 10 minutes.
(This used to be ctdb commit 4f0ace982dbb5b4f9c035dbf4cb0ae74cd18d81b)
This will control how many fast-path vacuuming runs wil have to
be done, before a full vacuuming will be triggered, i.e. one with
a db-traversal.
(This used to be ctdb commit 0d997ec7e61a7bee2cb05456f9c7d5e6f7a44797)
This is the function that fills the list of records to send to each lmaster
with the VACUUM_FETCH message.
This function will be reused in the traverse function for the delete_queue.
(This used to be ctdb commit d4ab790c1f679e833eb97816762fcfcee15ccb10)
This list will be filled by the client using a new
delete control. The list will then be used to implement
a fast-path vacuuming that will traverse this list instead
of traversing the database.
(This used to be ctdb commit 9bbedf786b26bb074f668b31f29a9032af958673)
This temporary flag is used for the local record storage function to
decide whether to delete an empty record which has never been migrated
with data as part of the fast-path vacuuming process or, or to store
the record.
(This used to be ctdb commit c11ca778ee90444c44dee0a629cd2eefa3a1f75e)
This way, the MIGRATED_WITH_DATA information can be transported
along with the records. This is important for vacuuming to function
properly.
The record flags are appended to the data section of the ctdb_req_dmaster
and ctdb_reply_dmaster structs.
Pair-Programmed-With: Stefan Metzmacher <metze@samba.org>
(This used to be ctdb commit 945187d64cfc7bd30a0c3b0d548cbe582d95dde3)
This way, the records coming in via this handler, can be treated appropriately.
Namely, they can be deleted instead of being stored when the meet the fast-path
vacuuming criteria (empty, never migrated with data...)
(This used to be ctdb commit fb5d832104970320359b3e474eb291ca3d629380)
This is to be used internally. The purpose is to flag a record
as been migrated by a VACUUM_MIGRATION, which is triggered by
a VACUUM_FETCH message as part of the vacuuming. The local store
routine will base its decision whether to delete or to store
the record (among other things) upon the value of this flag.
This flag should never be stored in the local database copies.
(This used to be ctdb commit dd2449c422f323f9b5485e45107a9cc5acc09e08)
This is to be used when the CTDB_SRVID_VACUUM_FETCH message
triggers the migration of deleted records to the lmaster.
The lmaster can then delete records that have not been
migrated with data instead of storing them.
(This used to be ctdb commit 455cc6616e10b7f09589f9b87cb60f591bb502b0)
Those records that are kept after recovery, are non-empty, and
stored identically on all nodes. So this is as if they had been
migrated with data.
Pair-Programmed-With: Stefan Metzmacher <metze@samba.org>
(This used to be ctdb commit 101be642e492a3a54231e2e3e6553a59380fe702)
When lmaster is bigger than the biggest recorded node number,
then exit the traverse with error.
(This used to be ctdb commit 3930c7796b72bbf275bbca8aaeceec3e705a964b)
Originally, the control was sent to all records in the vnn_map, but
there was something still missing here:
When a node can not become lmaster (via CTDB_CAPABILITY_LMASTER=no)
then it will not be part of the vnn_map. So such a node would
be active but never receive the TRY_DELETE_RECORDS control from a
vacuuming run.
This is fixed in this change by correctly building the list of
active nodes first in the same way that the recovery process does it.
(This used to be ctdb commit 49247df4a47a8a107fa7dd7b187e69e243e6bdbe)
This patch fixes segfaults in the vacuum child when at least one
node has been stopped or removed from the cluster:
The size of the vnn_map is only the number of active nodes
(that can be lmaster). But the node numbers that are referenced
by the vnn_map spread over all configured nodes.
Since the array of vacuum fetch lists is referenced by the
key's lmaster's node number later on, the array needs to
be of size num_nodes instad of vnn_map->size.
(This used to be ctdb commit 136508e3f4dd0acc210dde938ad59ef38b63d3a1)
