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From "Stefania (JIRA)" <j...@apache.org>
Subject [jira] [Comment Edited] (CASSANDRA-7066) Simplify (and unify) cleanup of compaction leftovers
Date Wed, 29 Jul 2015 02:52:05 GMT

    [ https://issues.apache.org/jira/browse/CASSANDRA-7066?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14645385#comment-14645385
] 

Stefania edited comment on CASSANDRA-7066 at 7/29/15 2:51 AM:
--------------------------------------------------------------

[~benedict]:

bq.  if we also log the last modified time of the file we're deleting alongside it,

At the moment we are logging descriptor names only, not file names. Should we revert back
to logging every single file instead? This would complicate things a bit.


was (Author: stefania):
[~benedict]:

bq.  if we also log the last modified time of the file we're deleting alongside it,

At the moment we are only logging descriptor names only, not file names. Should we revert
back to logging every single file instead?

> Simplify (and unify) cleanup of compaction leftovers
> ----------------------------------------------------
>
>                 Key: CASSANDRA-7066
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-7066
>             Project: Cassandra
>          Issue Type: Improvement
>          Components: Core
>            Reporter: Benedict
>            Assignee: Stefania
>            Priority: Minor
>              Labels: benedict-to-commit, compaction
>             Fix For: 3.0 alpha 1
>
>         Attachments: 7066.txt
>
>
> Currently we manage a list of in-progress compactions in a system table, which we use
to cleanup incomplete compactions when we're done. The problem with this is that 1) it's a
bit clunky (and leaves us in positions where we can unnecessarily cleanup completed files,
or conversely not cleanup files that have been superceded); and 2) it's only used for a regular
compaction - no other compaction types are guarded in the same way, so can result in duplication
if we fail before deleting the replacements.
> I'd like to see each sstable store in its metadata its direct ancestors, and on startup
we simply delete any sstables that occur in the union of all ancestor sets. This way as soon
as we finish writing we're capable of cleaning up any leftovers, so we never get duplication.
It's also much easier to reason about.



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