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From "Ryan McGuire (JIRA)" <j...@apache.org>
Subject [jira] [Comment Edited] (CASSANDRA-5195) Offline scrub does not migrate the directory structure on migration from 1.0.x to 1.1.x and causes the keyspace to disappear
Date Wed, 30 Jan 2013 04:09:13 GMT

    [ https://issues.apache.org/jira/browse/CASSANDRA-5195?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13566142#comment-13566142
] 

Ryan McGuire edited comment on CASSANDRA-5195 at 1/30/13 4:07 AM:
------------------------------------------------------------------

One other interesting aspect: Removing the patch, resetting /var/lib/cassandra to the 1.0.12
state, re-running sstablescrub, restarting cassandra (1,1.9) TWICE allows the keyspace to
be read, but the table is empty! :


* 11:03 PM:~/git/datastax/cassandra[5195-1.1.9*]$ cqlsh
  Connected to Test Cluster at localhost:9160.
  [cqlsh 2.2.0 | Cassandra 1.1.9-SNAPSHOT | CQL spec 2.0.0 | Thrift   protocol 19.33.0]
  Use HELP for help.
  cqlsh> use Keyspace1;
  cqlsh:Keyspace1> select count(*) from Standard1;
   count
   -------
        0

                
      was (Author: enigmacurry):
    One other interesting aspect: Removing the patch, resetting /var/lib/cassandra to the
1.0.12 state, re-running sstablescrub, restarting cassandra TWICE allows the keyspace to be
read, but the table is empty! :


* 11:03 PM:~/git/datastax/cassandra[5195-1.1.9*]$ cqlsh
  Connected to Test Cluster at localhost:9160.
  [cqlsh 2.2.0 | Cassandra 1.1.9-SNAPSHOT | CQL spec 2.0.0 | Thrift   protocol 19.33.0]
  Use HELP for help.
  cqlsh> use Keyspace1;
  cqlsh:Keyspace1> select count(*) from Standard1;
   count
   -------
        0

                  
> Offline scrub does not migrate the directory structure on migration from 1.0.x to 1.1.x
and causes the keyspace to disappear
> ----------------------------------------------------------------------------------------------------------------------------
>
>                 Key: CASSANDRA-5195
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-5195
>             Project: Cassandra
>          Issue Type: Bug
>          Components: Core
>    Affects Versions: 1.1.9
>            Reporter: Omid Aladini
>            Assignee: Jonathan Ellis
>             Fix For: 1.1.9
>
>         Attachments: 5195.patch
>
>
> Due to CASSANDRA-4411, upon migration from 1.0.x to 1.1.x containing LCS-compacted sstables,
an offline scrub should be run before Cassandra 1.1.x is started. But Cassandra 1.1.x uses
a new directory structure (CASSANDRA-2749) that offline scrubber doesn't detect or try to
migrate.
> How to reproduce:
> 1- Run cassandra 1.0.12.
> 2- Run stress tool, let Cassandra flush Keyspace1 or flush manually.
> 3- Stop cassandra 1.0.12
> 4- Run ./bin/sstablescrub Keyspace1 Standard1
>   which returns "Unknown keyspace/columnFamily Keyspace1.Standard1" and notice the data
directory isn't migrated.
> 5- Run cassandra 1.1.9. Keyspace1 doesn't get loaded and Cassandra doesn't try to migrate
the directory structure. Also commitlog entries get skipped: "Skipped XXXXX mutations from
unknown (probably removed) CF with id 1000"
> Without the unsuccessful step 4, Cassandra 1.1.9 loads and migrates the Keyspace correctly.
>   

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