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https://issues.apache.org/jira/browse/OAK-5970?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15970766#comment-15970766
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Chetan Mehrotra commented on OAK-5970:
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Indexes should store the number of entries in index as a hidden property which
can then be accessed by indexer to get an estimate about how many entries the
index has and then that can be used for index progress estimation.
In addition we can make use of counter index to determine potential estimate of
subtree count and based on current number of traversal done estimate the rest
> (Re-)Indexing: estimate progress / ETA
> --------------------------------------
>
> Key: OAK-5970
> URL: https://issues.apache.org/jira/browse/OAK-5970
> Project: Jackrabbit Oak
> Issue Type: New Feature
> Components: indexing
> Reporter: Thomas Mueller
> Assignee: Thomas Mueller
> Fix For: 1.8
>
>
> Reindexing can take a long time, so it would be good if we can estimate where
> we are at (for example in percent of the relevant number of nodes). It might
> also be possible to estimate when indexing will be done, and the current path.
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