INFO 12:20:42,822 Scrubbing SSTableReader(path='/var/lib/cassandra/data/system/schema_columnfamilies/system-schema_columnfamilies-ia-1-Data.db')
WARN 12:20:42,826 Non-fatal error reading row (stacktrace follows)
java.lang.RuntimeException: Error validating row DecoratedKey(61935297886570031978600740763604084078, 4b6579737061636531)
at org.apache.cassandra.io.sstable.SSTableIdentityIterator.getColumnFamilyWithColumns(SSTableIdentityIterator.java:244)
at org.apache.cassandra.db.compaction.PrecompactedRow.merge(PrecompactedRow.java:111)
at org.apache.cassandra.db.compaction.PrecompactedRow.<init>(PrecompactedRow.java:95)
at org.apache.cassandra.db.compaction.CompactionController.getCompactedRow(CompactionController.java:151)
at org.apache.cassandra.db.compaction.CompactionController.getCompactedRow(CompactionController.java:157)
at org.apache.cassandra.db.compaction.Scrubber.scrub(Scrubber.java:173)
at org.apache.cassandra.db.compaction.CompactionManager.scrubOne(CompactionManager.java:495)
at org.apache.cassandra.db.compaction.CompactionManager.doScrub(CompactionManager.java:484)
at org.apache.cassandra.db.compaction.CompactionManager.access$300(CompactionManager.java:66)
at org.apache.cassandra.db.compaction.CompactionManager$3.perform(CompactionManager.java:223)
at org.apache.cassandra.db.compaction.CompactionManager$2.call(CompactionManager.java:193)
at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:303)
at java.util.concurrent.FutureTask.run(FutureTask.java:138)
at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
at java.lang.Thread.run(Thread.java:662)
Caused by: org.apache.cassandra.db.marshal.MarshalException: String didn't validate.
at org.apache.cassandra.db.marshal.UTF8Type.validate(UTF8Type.java:65)
at org.apache.cassandra.db.Column.validateFields(Column.java:287)
at org.apache.cassandra.db.ColumnFamily.validateColumnFields(ColumnFamily.java:378)
at org.apache.cassandra.io.sstable.SSTableIdentityIterator.getColumnFamilyWithColumns(SSTableIdentityIterator.java:240)
... 15 more
WARN 12:20:42,826 Row at 19 is unreadable; skipping to next
WARN 12:20:42,827 No valid rows found while scrubbing SSTableReader(path='/var/lib/cassandra/data/system/schema_columnfamilies/system-schema_columnfamilies-ia-1-Data.db'); it is marked for deletion now. If you want to attempt manual recovery, you can find a copy in the pre-scrub snapshot