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https://issues.apache.org/jira/browse/CASSANDRA-14246?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Jeff Jirsa resolved CASSANDRA-14246.
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    Resolution: Not A Problem

> Cassandra fails to start after upgrade
> --------------------------------------
>
>                 Key: CASSANDRA-14246
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-14246
>             Project: Cassandra
>          Issue Type: Bug
>          Components: Core
>            Reporter: Rajnesh Siwal
>            Priority: Critical
>              Labels: proposed-wontfix
>
> We are unable to start cassandra after it has been upgraded.
> We have a cluster of three nodes. After upgrading the first node, we found 
> that the service failed to start on it because of incompatible SSTables:
> The older version: 2.0.17
> New Version: 2.1.20
> The cassandra fails to start as it found incompatible SSTable :
> INFO  08:38:18 Opening 
> /var/lib/cassandra/data/cp_orgstmt_keyspace/cp_event_processing/cp_orgstmt_keyspace-cp_event_processing-jb-2
>  (975 bytes)
> java.lang.RuntimeException: Incompatible SSTable found. Current version ka is 
> unable to read file: 
> /var/lib/cassandra/data/cp_emb_us_keyspace/cp_event_processing/cp_emb_us_keyspace-cp_event_processing-ic-3.
>  Please run upgradesstables.
> java.lang.RuntimeException: Incompatible SSTable found. Current version ka is 
> unable to read file: 
> /var/lib/cassandra/data/cp_emb_us_keyspace/cp_event_processing/cp_emb_us_keyspace-cp_event_processing-ic-3.
>  Please run upgradesstables.
> Exception encountered during startup: Incompatible SSTable found. Current 
> version ka is unable to read file: 
> /var/lib/cassandra/data/cp_emb_us_keyspace/cp_event_processing/cp_emb_us_keyspace-cp_event_processing-ic-3.
>  Please run upgradesstables.
>  
> Till the time cassandra server is not running, we cannot run "nodetool 
> upgradesstables".
> Please suggest



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