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https://issues.apache.org/jira/browse/LUCENE-4975?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Shai Erera updated LUCENE-4975:
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Attachment: LUCENE-4975.patch
bq. maybe also call MDW.setRandomIOExceptionRateOnOpen
Thanks Mike! I added that and a slew of problems surfaced, most of them in the
test, but I improved the handlers' implementation to cleanup after themselves
if e.g. a copy or sync to the handlerDir failed. While this wasn't a bug, it
leaves the target index directory clean.
There's one nocommit which bugs me though -- I had to add
dir.setPreventDoubleWrite(false) because when the handler fails during copying
of say _2.fdt to the index dir, the file is deleted from the indexDir, and the
client re-attemts to upgrade. At this point, MDW complains that _2.fdt was
already written to, even though I deleted it.
Adding this setPrevent was the only way I could make MDW happy, but I don't
like it since I do want to catch errors in the handler/client if they e.g.
attempt to copy over an existing file.
Maybe we can make MDW respond somehow to delete()? I know that has bad
implications on its own, e.g. code which deletes and then accidentally
recreates files with older names ... any ideas?
> Add Replication module to Lucene
> --------------------------------
>
> Key: LUCENE-4975
> URL: https://issues.apache.org/jira/browse/LUCENE-4975
> Project: Lucene - Core
> Issue Type: New Feature
> Reporter: Shai Erera
> Assignee: Shai Erera
> Attachments: LUCENE-4975.patch, LUCENE-4975.patch, LUCENE-4975.patch,
> LUCENE-4975.patch, LUCENE-4975.patch
>
>
> I wrote a replication module which I think will be useful to Lucene users who
> want to replicate their indexes for e.g high-availability, taking hot backups
> etc.
> I will upload a patch soon where I'll describe in general how it works.
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