David Capwell created CASSANDRA-18934:
-----------------------------------------
Summary: Downgrade to 4.1 fails due to schema changes
Key: CASSANDRA-18934
URL: https://issues.apache.org/jira/browse/CASSANDRA-18934
Project: Cassandra
Issue Type: Bug
Components: Local/Startup and Shutdown
Reporter: David Capwell
We are required to support 5.0 downgrading to 4.1 as a migration step, but we
don’t have tests to show this is working… I wrote a quick test to make sure a
change we needed in Accord wouldn’t block the downgrade and see that we fail
right now.
{code}
ERROR 20:56:39 Exiting due to error while processing commit log during
initialization.
org.apache.cassandra.db.commitlog.CommitLogReadHandler$CommitLogReadException:
Unexpected error deserializing mutation; saved to
/var/folders/h1/s_3p1x3s3hl0hltbpck67m0h0000gn/T/mutation4184214444767150092dat.
This may be caused by replaying a mutation against a table with the same name
but incompatible schema. Exception follows: java.lang.RuntimeException:
Unknown column compaction_properties during deserialization
at
org.apache.cassandra.db.commitlog.CommitLogReader.readMutation(CommitLogReader.java:464)
at
org.apache.cassandra.db.commitlog.CommitLogReader.readSection(CommitLogReader.java:397)
at
org.apache.cassandra.db.commitlog.CommitLogReader.readCommitLogSegment(CommitLogReader.java:244)
at
org.apache.cassandra.db.commitlog.CommitLogReader.readCommitLogSegment(CommitLogReader.java:147)
at
org.apache.cassandra.db.commitlog.CommitLogReplayer.replayFiles(CommitLogReplayer.java:191)
at
org.apache.cassandra.db.commitlog.CommitLog.recoverFiles(CommitLog.java:223)
at
org.apache.cassandra.db.commitlog.CommitLog.recoverSegmentsOnDisk(CommitLog.java:204)
{code}
This was caused by a schema change in CASSANDRA-18061
{code}
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package org.apache.cassandra.distributed.upgrade;
import java.io.IOException;
import java.io.File;
import java.util.concurrent.atomic.AtomicBoolean;
import org.junit.Test;
import org.apache.cassandra.distributed.api.IUpgradeableInstance;
public class DowngradeTest extends UpgradeTestBase
{
@Test
public void test() throws Throwable
{
AtomicBoolean first = new AtomicBoolean(true);
new TestCase()
.nodes(1)
.withConfig(c -> {
if (first.compareAndSet(true, false))
c.set("storage_compatibility_mode", "CASSANDRA_4");
})
.downgradeTo(v41)
.setup(cluster -> {})
.runBeforeNodeRestart((cluster, nodeId) -> {
IUpgradeableInstance inst = cluster.get(nodeId);
File f = new File((String)
inst.config().get("commitlog_directory"));
deleteRecursive(f);
})
.runAfterClusterUpgrade(cluster -> {})
.run();
}
private void deleteRecursive(File f)
{
if (f.isDirectory())
{
File[] children = f.listFiles();
if (children != null)
{
for (File c : children)
deleteRecursive(c);
}
}
f.delete();
}
}
{code}
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