On 05/25/2016 10:19 AM, thierry bordaz
wrote:
On 05/25/2016 08:47 AM, Ludwig
Krispenz wrote:
On 05/24/2016 07:00 PM, thierry
bordaz wrote:
On 05/24/2016 05:24 PM, Ludwig
Krispenz wrote:
On 05/24/2016 04:20 PM, thierry
bordaz wrote:
Hi Ludwig,
Thanks for your explanation. The design looks very good. I
think it would be good to put into the code (especially
clcache_adjust_anchorcsn) the reference to the related
design paragraph.
There is something I do not understand in
clcache_skip_change.
My understanding is that this is the only place where the
consumer_maxcsn is updated.
But there are several conditions, if we decide to skip the
update that the consumer_maxcsn is not updated.
One of them is 'rid == buf->buf_consumer_rid'.
Does that mean that the consumer_maxcsn remains unchanged
for the RID of the consumer ?
the condition is:
if( rid == buf->buf_consumer_rid &&
buf->buf_ignoreConsumerRID)
so it will only be skipped if we determined that we don't
need to send anything for the consumers own rid
Ok. I get it. thanks.
An other question regarding the update of buf_consumer_ruv.
My understanding is that it contains the initial consumer RUV.
But later it is used in
clcache_refresh_consumer_maxcsns/clcache_refresh_local_maxcsn
to fill consumer_maxcsn.
consumer_maxcsn are updated with the non skipped updates to
reflect the current status of the consumer.
But when consumer_maxcsns/clcache_refresh_local_maxcsn are
called my understanding is that consumer_maxcsn are reset with
buf_consumer_ruv (initial consumer RUV).
Do I get it right ?
no :-) At least I think I have implemented it differently.
The consumer_maxcsn is set in clcache_refresh_consumer_maxcsns(),
which is only called at the first buffer load, not at the
relaod.
In clcache_refresh_local_maxcsns it is only set if
we have to add a RID to the cscb list, but then no change for
this rid was sent before.
OK thanks for the explanation.
I was wondering if consumer_maxcsn could go back to
buf_consumer_ruv but in those cases (first load and first update
on known RID) it is right.
Just minor comments on clcache_load_buffer.
- 'rc' should be tested against CLC_STATE_* values not 0.
the statement
if (rc == 0)
is something Ididn't change :-), CLC_STATE_READY is 0, so it
could be changed to
if (rc == CLC_STATE_READY)
if you prefer
- if clcache_initial_anchorcsn or clcache_adjust_anchorcsn
return let's say CLC_STATE_CSN_GT_RUV, in clcache_load_buffer
it will return a CLC_STATE_* value not a DB_* value.
but it will only return CLC_STATE_READY or CLC_STATE_DONE and these
are checked
- clcache_refresh_consumer_maxcsns is only called at first
load, why not including/inlining it into
clcache_initial_anchorcsn
I was seeing clcache_refresh_consumer_maxcsns() and
clcache_refresh_local_maxcsns() as parallel as well as
clcache_*_anchorcsn(). The anchorcsn functions operate on a given
state of cscb[] and I don't want to mix it.
Thanks
thierry
thanks
thierry
thanks
thierry
On 05/24/2016 09:22 AM,
Ludwig Krispenz wrote:
Hi,
On 05/23/2016 06:29 PM,
thierry bordaz wrote:
On 05/23/2016 03:06 PM, Ludwig Krispenz wrote:
This is the latest version of
the "changelog buffer processing" fixes.
https://fedorahosted.org/389/ticket/48766
https://fedorahosted.org/389/attachment/ticket/48766/0001-reworked-clcach-buffer-code-following-design-at-http.patch
The background for the fix is here, I would like to
get feedback on this as well to clarify what is
unclear
http://www.port389.org/docs/389ds/design/changelog-processing-in-repl-state-sending-updates.html
Hello Ludwig,
I have not yet reviewed the patch. I was looking at
the design.
Regarding your note: http://www.port389.org/docs/389ds/design/changelog-processing-in-repl-state-sending-updates.html#special-case-rid-of-the-consumer-in-the-current-replication-session.
If you refer to this part:
Special
case: RID of the consumer
in the current replication session
If the consumer in the replication session is also a
master its RID will be
contained at least in the consumerRUV.
If it is also in the supplier RUV
the question is if it should be considered in the
decision if updates should be sent. Normally a master
has the latest changes applied to itself, so there
would be no need to check and send updates for its RID. But there can be scenarios
where this is not the case: if the consumer has been
restored from an older backup the latest csn for its
own RID might be older than
changes available on other servers.
NOTE: The current implementation ignores anchorCSNs based on the consumer RID. If, by chance, the anchor csn used is older than this csn, the changes will be sent, but they also ca nbe lost.
this referres to the "current" implementation before the
fix, the doc started as a post-design doc, and it shoul
dbe correctedd
with the fix the if the supplier has newer changes for
the consumerRID than the consumer it will be reflected
in the anchor csn calculation.
It is said that the anchorCSN will not be the from the
consumerRID. What is the mechanism that guaranty that
the consumer will receive all the updates it was the
originator ?
thanks
thierry
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