[jira] [Commented] (CASSANDRA-9434) If a node loses schema_columns SSTables it could delete all secondary indexes from the schema

["Richard Low (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/CASSANDRA-9434?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14551601#comment-14551601 ] 

Richard Low commented on CASSANDRA-9434:
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cc [~iamaleksey]


> If a node loses schema_columns SSTables it could delete all secondary indexes from the schema
> ---------------------------------------------------------------------------------------------
>
>                 Key: CASSANDRA-9434
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-9434
>             Project: Cassandra
>          Issue Type: Bug
>            Reporter: Richard Low
>
> It is possible that a single bad node can delete all secondary indexes if it restarts and cannot read its schema_columns SSTables. Here's a reproduction:
> * Create a 2 node cluster (we saw it on 2.0.11)
> * Create the schema:
> create keyspace myks with replication = {'class':'SimpleStrategy', 'replication_factor':1};
> use myks;
> create table mytable (a text, b text, c text, PRIMARY KEY (a, b) );
> create index myindex on mytable(b);
> NB index must be on clustering column to repro
> * Kill one node
> * Wipe its commitlog and system/schema_columns sstables.
> * Start it again
> * Run on this node
> select index_name from system.schema_columns where keyspace_name = 'myks' and columnfamily_name = 'mytable' and column_name = 'b';
> and you'll see the index is null.
> * Run 'describe schema' on the other node. Sometimes it will not show the index, but you might need to bounce for it to disappear.
> I think the culprit is SystemKeyspace.copyAllAliasesToColumnsProper.



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