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So, in case you didn't get chance to check the web on weekends here is a summary of what we covered on weekend. I guess Kristian's proposal below is what could work in this situation.
I guess recovering node will provide missing interval using GTID, which peer will translate to local LSN and will be able to provide a delta using xtrabackup.
Ah, ok. I was assuming Galera knows the id of the transaction it is working on. I thought it was just the LSN you cannot know beforehand. But I realize now the final ordering of the transaction is only known after replication, makes sense.
If you don't know the GTID beforehand this is indeed more complicated, as you'd have to store that information somehow "atomically" with the transaction itself, but this is of course not possible. The state is written into the transaction log as part of the commit, not into any table.
A similar method should work for Galera sequence number, though it will require some work for sure. There is a fixed but efficient ordering between commits in InnoDB and the binlog or primary redundancy service plugin. So this together with 1 should allow to leave no holes by starting from the right Galera sequence number. Still, it requires that Galera cluster is able to provide a joining node with the full sequence of Galera replication events from a given sequence number on. Clearly it must already be able to do so on a non-incremental state transfer to catch up, but I guess the list of events is received and buffered by the joining node during the transfer.
Otherwise active nodes would have to either each write the full list of Galera events to some kind of binlog, or the joining node would need to somehow merge binlogs received from each active node. So agree it does not look trivial Kristian, thanks for pointing up 1. I guess we could simply hijack the binlog position space fro Galera transaction ID, since semantically they are the same am I right that this is used only for slave recovery?
I wonder if that can be utilized for xtrabackup incremental mode. As for Galera events "binlog", it is almost done and may see the light in one of the nearest releases. In fact, the only thing InnoDB does is write the information into the log at startup XtraBackup does the same during restore.
Re 1 , does innodb write binlog position into InnoDB table space or logs at some point? You are saying this is not needed at least not master status because the last binlog position is already stored inside the innodb data and xtrabackup could just extract it from there?
The detailed explanation is that there is a fixed location in the system tablespace, and this is overwritten in each commit with the corresponding binlog position. Since every write to tablespace is logged as redo in the transaction log, the position is effectively written into the log at commit. XtraBackup by itself does not lock any tables. It copies just the InnoDB table spaces and transaction log.
After recovering using the redo log, it reads the binlog position from the fixed location and prints it. So you only get the correct binlog position if the last event in the binlog is DML against InnoDB, it does not handle. So it is two different ways of taking the backup, and two different ways to get the binlog position. Right, so for taking a full backup it's actually less useful, like you say, as you would miss any non-InnoDB transactions.
But for Galera this is more useful, since they are InnoDB-only anyway they could use this for their snapshotting - with the exception of occasional DDL or other non-InnoDB commands that they do replicate.
Galera seems to be quite an interesting project. A pity that there's not much documentation, according to your post it should deserve more attention. If mysql had a userfriendl ier way to handle clustering, that would be awesome.
Hi Pavel, So how much of a documentation would you like to have for a "userfriendl ier way to handle clustering"? Well IMHO the information on your site is rather scattered. Dumb it down, keep the introduction simple. Tell people about the major features current Galera offers, about its licensing and give links to directly download Galera - point out the prebuild binaries as well as the source.
Provide a link i. Point people i. Asynchronous Replication". If a user stumbles upon this page, he won't know if Galera provides sync or async or both, because you don't advertise the features visibly enough. Dumb it down and explain what configuration options they want to tweak i.
You can do that by linking to the relevant docs page. Products, info, services and downloads could all be in a single category. If you want people to register, advertise the free consulting offer along with information on your products, not with the download link.
Hope I made my point. At first, the docs should probably have a dumbed-down introduction of what Galera does. You can do this by some Infographics. I pretty much agree with them. Our web-site is a disaster. The content on this site is published with the Creative Commons Attribution License. We use semantic versions. The patch number is a commit step indicator relative to the 2. You can find the detection logic for this version at commit c0f4.
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