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From "Marcus Eriksson (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (CASSANDRA-13294) Possible data loss on upgrade 2.1 - 3.0
Date Mon, 06 Mar 2017 13:42:33 GMT

     [ https://issues.apache.org/jira/browse/CASSANDRA-13294?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Marcus Eriksson updated CASSANDRA-13294:
----------------------------------------
    Status: Ready to Commit  (was: Patch Available)

> Possible data loss on upgrade 2.1 - 3.0
> ---------------------------------------
>
>                 Key: CASSANDRA-13294
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-13294
>             Project: Cassandra
>          Issue Type: Bug
>            Reporter: Marcus Eriksson
>            Assignee: Marcus Eriksson
>            Priority: Blocker
>             Fix For: 3.0.x, 3.11.x
>
>
> After finishing a compaction we delete the compacted away files. This is done [here|https://github.com/apache/cassandra/blob/cassandra-3.0/src/java/org/apache/cassandra/db/lifecycle/LogFile.java#L328-L337]
which uses [this|https://github.com/apache/cassandra/blob/cassandra-3.0/src/java/org/apache/cassandra/db/lifecycle/LogRecord.java#L265-L271]
to get the files - we get all files starting with {{absoluteFilePath}}. Absolute file path
is generated [here|https://github.com/apache/cassandra/blob/cassandra-3.0/src/java/org/apache/cassandra/io/sstable/Descriptor.java#L142-L153].
For 3.0 version files the filename looks like this: {{/blabla/keyspace1/standard1-bdb031c0ff7b11e6940fdd0479dd8912/mc-1332-big}}
but for 2.1 version files, they look like this: {{/blabla/keyspace1/standard1-bdb031c0ff7b11e6940fdd0479dd8912/keyspace1-standard1-ka-2}}.
> The problem is then that if we were to finish a compaction including the legacy file,
we would actually delete all legacy files having a generation starting with '2'



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