Which PC is the master for purposes of Sync?
There are thousands of posts here for how to set up and troubleshoot Sync but none i can find that tell me how it actually works and how to control the sync process from a master/slave standpoint.
I have an old XP box that I'm replacing with a new Lenovo, plus a Dell XPS laptop that I'll be continuing to use. I want the laptop and the Lenovo to mirror the FF settings on the old XP desktop that I'm retiring. But the changes are flowing in all directions; things I set up on the Lenovo are populating back to the XP.
How do I flag the XP box as the master so its config will flow to the other two machines?
<<Then once you retire the XP. You will need to choose one of the other machines as the main one. >>
How do I choose the main one? I have read many of the docs and never found a hint about this.
Setting up Sync has been very difficult. The system messages are unclear...it's not even possible to know if a machine is set up unless you know the "secret" about seeing "Set Up Sync" on the menu. Might be logical to the developer but not to this end-user.
Last night I was running back and forth for hours trying to set it up on my PC's. My notes include six sets of 12-character codes and one of those long password strings. When the link-up fails, there's no error message.
Last night I renamed the whole feature "Firefox Stync" I was so frustrated. Who designed this anyway? Pardon the rant but it obviously was not tested by end-users, judging from the huge volume of questions it generates.
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Which computer is the master account in a sync?
I have worked all day to clean up the bookmarks on my laptop and now want them reflected/synced to my other firefox computers. How to I do this?
Hello jimmoffatt, please read carefully the next article to do that :
* [https://support.mozilla.org/en-US/kb/how-do-i-set-up-firefox-sync How do I set up Firefox Sync?]
* [https://support.mozilla.org/en-US/kb/add-a-device-to-firefox-sync How do I add a device to Firefox Sync?]
* [https://support.mozilla.org/en-US/kb/how-do-i-choose-what-types-information-sync-firefo How do I choose what types of information to sync on Firefox?]
Good luck, if you need anything else, or you find something that you don't understand just tell us. :-)
thank you -
Slave instance can not synchronized with the master for a long time
Hi,
Slave instance can not synchronized with the master for a long time, and the gap of LSNs between slave and master are more and more larger. The transfer bytes per second between master and slave is 118MB/s , upper limit to the ethernet card. Why???
ENVIRONMENT:
1. A network program which we called mcdb is based on BDB 4.8.30. It is used to accept get/set requests and then query data from bdb or save data to bdb.
2. mcdb implements replication with bdb replication manager api. The default start replication policy is DB_REP_ELECTION, rep ack policy is DB_REPMGR_ACKS_ONE_PEER and rep priority is 100.
3. The bdb data files, bdb log files, region files and rep files are all in the same home directory.
4. There are two instances of the mcdb are separately on two standalone servers which has no other programs. These two instances are in one replication group which can elect a master automatically.
5. The master instance is online, which has lots of requests (get, set, delete).
ACTIONS:
1. Start two mcdb instances on two servers and the two instance make a replication group. Slave has already synchronized with the master.
2. Stop the slave for a long time (more than 20 hours).
3. Start the slave instance to synchronize data with master.
RESULT:
1. the gap of LSNs between slave and master are more and more larger.
2. db_stat of master and slave:
master db_stat:
467170 Number of PERM messages not acknowledged
9245 Number of messages queued due to network delay
172415 Number of messages discarded due to queue length
25880 Number of existing connections dropped
3407 Number of failed new connection attempts
=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
DB_REPMGR site information:
10.67.15.146 (eid: 0, port: 30011)
Environment configured as a replication master
331726/3574994 Next LSN to be used
0/0 Not waiting for any missed log records
328872/466092 Maximum permanent LSN
0 Next page number expected
0 Not waiting for any missed pages
0 Number of duplicate master conditions originally detected at this site
2147M Current environment ID (2147483647)
100 Current environment priority
49 Current generation number
50 Election generation number for the current or next election
2323 Number of duplicate log records received
0 Number of log records currently queued
6768 Maximum number of log records ever queued at once
55284 Total number of log records queued
120M Number of log records received and appended to the log (120475988)
111 Number of log records missed and requested
2147M Current master ID (2147483647)
2 Number of times the master has changed
0 Number of messages received with a bad generation number
8505306 Number of messages received and processed
12 Number of messages ignored due to pending recovery
471869 Number of failed message sends
12M Number of messages sent (12959945)
0 Number of new site messages received
1 Number of environments believed to be in the replication group
990543 Transmission limited
0 Number of outdated conditions detected
0 Number of duplicate page records received
0 Number of page records received and added to databases
0 Number of page records missed and requested
Startup complete
6244678 Number of transactions applied
0 Number of startsync messages delayed
1 Number of elections held
1 Number of elections won
No election in progress
0.057097 Duration of last election (seconds)
8944103 Number of bulk buffer sends triggered by full buffer
0 Number of single records exceeding bulk buffer size
5273M Number of records added to a bulk buffer (5273592170)
10M Number of bulk buffers sent (10490865)
0 Number of re-request messages received
0 Number of request messages this client failed to process
0 Number of request messages received by this client
slave db_stat:
0 Number of PERM messages not acknowledged
0 Number of messages queued due to network delay
0 Number of messages discarded due to queue length
1454 Number of existing connections dropped
0 Number of failed new connection attempts
=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
DB_REPMGR site information:
10.67.15.147 (eid: 0, port: 30011)
Environment configured as a replication client
329544/2916048 Next LSN expected
330433/2013808 LSN of first log record we have after missed log records
329543/5500501 Maximum permanent LSN
0 Next page number expected
0 Not waiting for any missed pages
0 Number of duplicate master conditions originally detected at this site
2147M Current environment ID (2147483647)
100 Current environment priority
49 Current generation number
50 Election generation number for the current or next election
5256M Number of duplicate log records received (5256599432)
3925284 Number of log records currently queued
3925285 Maximum number of log records ever queued at once
4880561 Total number of log records queued
3578038 Number of log records received and appended to the log
1912297 Number of log records missed and requested
0 Current master ID
1 Number of times the master has changed
0 Number of messages received with a bad generation number
12M Number of messages received and processed (12980442)
2 Number of messages ignored due to pending recovery
0 Number of failed message sends
1912307 Number of messages sent
0 Number of new site messages received
0 Number of environments believed to be in the replication group
0 Transmission limited
0 Number of outdated conditions detected
0 Number of duplicate page records received
0 Number of page records received and added to databases
0 Number of page records missed and requested
Startup incomplete
110568 Number of transactions applied
80 Number of startsync messages delayed
0 Number of elections held
0 Number of elections won
No election in progress
0 Number of bulk buffer sends triggered by full buffer
0 Number of single records exceeding bulk buffer size
0 Number of records added to a bulk buffer
0 Number of bulk buffers sent
0 Number of re-request messages received
0 Number of request messages this client failed to process
0 Number of request messages received by this client
Edited by: 899585 on 2013-1-4 下午10:54
Edited by: 899585 on 2013-1-4 下午10:55Hi,
Unfortunately, this issue is beyond the level of what is supported over the forum. Performance related issues are extremely complex and require an in-depth understanding of your environment and dedicated support. In a generic sense, you can look at this as a basic queueing problem. You have a server that went down and work is still coming in. When the server gets started it is possible that it may never catch up depending on new work coming in and the rate at processing the old work.
So what would you do in this case --- one thing would be to reduce the new work coming in. In HA terms this would be slowing the master down and you can increase DB_REP_ACK_TIMEOUT for this. Another thing you could do is add fresh servers to help reduce the workload. In HA terms, this would be the equivalent of restarting the client and give it a fresh look at everything. Another thing you could do is replan the system and load balance. In HA terms, it would mean something like take a hot backup of the master and reinit a client from scratch.
If you are interested in getting a dedicated support person working on this concern, please let me know and we can move forward down that path. Just respond to the thread with your email address and I will get in contact with you so we can pursue that approach.
thanks
mike -
After completed as an MBA HR & System, Which module is the best for freshers ??
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