Add an extended operation to re-index an attribute
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Key: DIRSERVER-1477
URL: https://issues.apache.org/jira/browse/DIRSERVER-1477
Project: Directory ApacheDS
Issue Type: New Feature
Reporter: Emmanuel Lecharny
Fix For: 2.0.0-RC1
We need a way to re-index an attribute live. The best solution would be to add
an extended operation to do so.
The problem we will have with this approach is that we should deal with the
ongoing operations : search, add, delete, etc... while the index is being
rebuilt.
One solution would be to :
- block any update during the index construction
- keep directing pending search operations on the previous table until the
index is built
- new search will also be using the previous index until the index is built
- when the index is built, then we should redirect all the operation to the new
index
- when we don't have anymore operations using the old index, then we can ditch
it
- one special case is the persistent search operation. We should redirect it to
use the new index when it has been rebuilt
- last, not least, the new update operations (those which has been sent after
the ExtendedOperation has been received) should be hold in a queue until the
index is built.
I don't think it should be a big deal to implement such a system, but we can
restrain it to newly added index (reindexing should be just used when the
index is broken, and it's more or less an admin task).
Not sure either it makes sense to add an operation to remove an index, but why
not.
We should also have a specific parameter if we want to modify the index cache
size.
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