[jira] [Commented] (CASSANDRA-12969) Index: index can significantly slow down boot

["Sam Tunnicliffe (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/CASSANDRA-12969?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15708470#comment-15708470 ] 

Sam Tunnicliffe commented on CASSANDRA-12969:
---------------------------------------------

Thanks, that is a sensible optimisation. I've pushed 3.X & trunk branches with the patch for CI. Assuming the test results look OK (which I'm sure they will), I'll commit once those are done.

> Index: index can significantly slow down boot
> ---------------------------------------------
>
>                 Key: CASSANDRA-12969
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-12969
>             Project: Cassandra
>          Issue Type: Improvement
>          Components: CQL
>            Reporter: Corentin Chary
>             Fix For: 3.x
>
>         Attachments: 0004-index-do-not-re-insert-values-in-IndexInfo.patch
>
>
> During startup, each existing index is opened and marked as built by adding an entry in "IndexInfo" and forcing a flush. Because of that we end up flushing one sstable per index. On systems on HDD this can take minutes for nothing.
> Thw following patch allows to avoid creating useless new sstables if the index was already marked as built and will greatly reduce the startup time (and improve availability during restarts).



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