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Date: Mon, 31 Jul 2017 23:56:04 +0000 (UTC)
From: "Tania S Engel (JIRA)" <jira@apache.org>
To: commits@cassandra.apache.org
Message-ID: <JIRA.13063579.1492021414000.57156.1501545364008@Atlassian.JIRA>
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Subject: [jira] [Updated] (CASSANDRA-13441) Schema version changes for each
 upgraded node in a rolling upgrade, causing migration storms
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archived-at: Mon, 31 Jul 2017 23:56:19 -0000


     [ https://issues.apache.org/jira/browse/CASSANDRA-13441?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Tania S Engel updated CASSANDRA-13441:
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> Schema version changes for each upgraded node in a rolling upgrade, causing migration storms
> --------------------------------------------------------------------------------------------
>
>                 Key: CASSANDRA-13441
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-13441
>             Project: Cassandra
>          Issue Type: Bug
>          Components: Distributed Metadata
>            Reporter: Jeff Jirsa
>            Assignee: Jeff Jirsa
>             Fix For: 3.0.14, 3.11.0, 4.0
>
>
> In versions < 3.0, during a rolling upgrade (say 2.0 -> 2.1), the first node to upgrade to 2.1 would add the new tables, setting the new 2.1 version ID, and subsequently upgraded hosts would settle on that version.
> When a 3.0 node upgrades and writes its own new-in-3.0 system tables, it'll write the same tables that exist in the schema with brand new timestamps. As written, this will cause all nodes in the cluster to change schema (to the version with the newest timestamp). On a sufficiently large cluster with a non-trivial schema, this could cause (literally) millions of migration tasks to needlessly bounce across the cluster.


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