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https://issues.apache.org/jira/browse/SOLR-6054?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14113034#comment-14113034
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Mark Miller commented on SOLR-6054:
-----------------------------------
I thought about doing a polling thread as well, but in the end, figured that it
was better to avoid it - didn't seem worth the trouble compared to doing it in
line. The advantage to the polling is a repeated progress when progress is
super slow or stopped, but you should be able to see that in the logs with the
in line method as well by looking at the most recent logging.
We also have to take into account the HdfsTransactionLog, which SOLR-6403
already does.
> Log progress of transaction log replays
> ---------------------------------------
>
> Key: SOLR-6054
> URL: https://issues.apache.org/jira/browse/SOLR-6054
> Project: Solr
> Issue Type: Improvement
> Components: SolrCloud
> Reporter: Shalin Shekhar Mangar
> Priority: Minor
> Fix For: 4.9, 5.0
>
> Attachments: SOLR-6054.patch
>
>
> There is zero logging of how a transaction log replay is progressing. We
> should add some simple checkpoint based progress information. Logging the
> size of the log file at the beginning would also be useful.
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