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https://issues.apache.org/jira/browse/OAK-3054?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14618259#comment-14618259
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Davide Giannella commented on OAK-3054:
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In order to "debug" such situations would help if the MBean (or any other)
could expose the status of the properties under the {{/:async}} node and the
list of all available checkpoints.
> IndexStatsMBean should provide some details if the async indexing is failing
> ----------------------------------------------------------------------------
>
> Key: OAK-3054
> URL: https://issues.apache.org/jira/browse/OAK-3054
> Project: Jackrabbit Oak
> Issue Type: Improvement
> Components: query
> Reporter: Chetan Mehrotra
> Priority: Minor
> Fix For: 1.2.3, 1.3.3, 1.0.17
>
>
> If the background indexing fails for some reason it logs the exception for
> the first time then it logs the exception like _The index update failed ..._.
> After that if indexing continues to fail then no further logging is done so
> as to avoid creating noise.
> This poses a problem on long running system where original exception might
> not be noticed and index does not show updated result. For such cases we
> should expose the indexing health as part of {{IndexStatsMBean}}. Also we can
> provide the last recorded exception.
> Administrator can then check for MBean and enable debug logs for further
> troubleshooting
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