disable replication on master side
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Key: SOLR-1175
URL: https://issues.apache.org/jira/browse/SOLR-1175
Project: Solr
Issue Type: New Feature
Components: replication (java)
Affects Versions: 1.4
Environment: any
Reporter: Jianhan
Priority: Minor
Fix For: 1.4
In an environment where one master and several slaves are deployed, it usually
takes more effort to discover all the slaves and disable replication on slave
side (which is available right now), and it would be much easier to disable it
on master instance (when, for example, there is a need to rebuild the index,
yet search has to continue). The following is the original email describing a
scenario when this feature is needed.
Hi,
Occasionally, we want to build our indexes from scratch, and during this period
we want our search continue to work. Here are the steps that I think will do it
1. on all slaves: disable replication
2. on master: stop the server
3. on master: delete all the documents
4. on master: restart the server
5. on master: index all documents
6. on slaves: enable replication
The only problem is: step 1 and 6. We may schedule any time to rebuild indexes
and it is an automated process. It is possible to let the master to disable
replication on all slaves, but then we have to discover all the slaves
automatically, also exceptions may happen, e.g. a slave may be down at the time
and then restarted later on. Anyhow it becomes an unreliable process. So I am
thinking of somehow disabling replication on the master side during reindex,
i.e. set a state on master so that any request for replication will be ignored.
That all the steps described above will be on master side only.
Is that possible?
By the way, I am talking about solr 1.4. I looked at how 1.3 works, and noticed
that in 1.3 there is a way to disable replication on master side: shutdown
rsyncd, so I guess it would be nice to have something equivalent in solr 1.4.
Thanks,
Jianhan
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