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From "Pavel Yaskevich (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (CASSANDRA-12374) Can't rebuild SASI index
Date Thu, 18 Aug 2016 22:07:20 GMT

    [ https://issues.apache.org/jira/browse/CASSANDRA-12374?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15427265#comment-15427265
] 

Pavel Yaskevich commented on CASSANDRA-12374:
---------------------------------------------

bq.  currently unqueriable indexes / are skipped.

Yes, that was intentional, because there is (and probably still isn't) a good way to propagate
exceptions in a meaningful way, so we've opted out to writing to the log and returning 0 results
instead.

> Can't rebuild SASI index
> ------------------------
>
>                 Key: CASSANDRA-12374
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-12374
>             Project: Cassandra
>          Issue Type: Bug
>            Reporter: Alex Petrov
>            Assignee: Alex Petrov
>
> There's been no real requirement for that so far. 
> As [~beobal] has pointed out, it's not a big issue, since that only could be needed when
index files are lost, data corruption on disk (hardware issue) has occurred or there was a
bug that'd require an index rebuild.
> During {{rebuild_index}} task, indexes are only "marked" as removed with {{SecondaryIndexManager::markIndexRemoved}}
and then {{buildIndexesBlocking}} is called. However, since SASI keeps track of SSTables for
the index, it's going to filter them out with {{.filter((sstable) -> !sasi.index.hasSSTable(sstable))}}
in {{SASIIndexBuildingSupport}}.
> If I understand the logic correctly, we have to "invalidate" (drop data) right before
we re-index them. This is also a blocker for [CASSANDRA-11990] since without it we can't have
an upgrade path.
> I have a patch ready in branch, but since it's a bug, it's better to have it released
earlier and for all branches affected.
> cc [~xedin]



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