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org.apache.cassandra.serializers.MarshalException: String didn 't validate.
org.apache.cassandra.serializers.MarshalException: String didn't validate.	at org.apache.cassandra.serializers.UTF8Serializer.validate(UTF8Serializer.java:35)	at org.apache.cassandra.db.marshal.AbstractType.validate(AbstractType.java:172)	at org.apache.cassandra.db.Column.validateName(Column.java:295)	at org.apache.cassandra.db.Column.validateFields(Column.java:300)	at org.apache.cassandra.db.ExpiringColumn.validateFields(ExpiringColumn.java:181)	at org.apache.cassandra.io.sstable.SSTableIdentityIterator.next(SSTableIdentityIterator.java:147)	at org.apache.cassandra.io.sstable.SSTableIdentityIterator.next(SSTableIdentityIterator.java:32)	at org.apache.cassandra.utils.MergeIterator$OneToOne.computeNext(MergeIterator.java:203)	at com.google.common.collect.AbstractIterator.tryToComputeNext(AbstractIterator.java:143)	at com.google.common.collect.AbstractIterator.hasNext(AbstractIterator.java:138)	at com.google.common.collect.Iterators$7.computeNext(Iterators.java:645)	at com.google.common.collect.AbstractIterator.tryToComputeNext(AbstractIterator.java:143)	at com.google.common.collect.AbstractIterator.hasNext(AbstractIterator.java:138)	at org.apache.cassandra.db.ColumnIndex$Builder.buildForCompaction(ColumnIndex.java:156)	at org.apache.cassandra.db.compaction.LazilyCompactedRow.write(LazilyCompactedRow.java:101)	at org.apache.cassandra.io.sstable.SSTableWriter.append(SSTableWriter.java:169)	at org.apache.cassandra.db.compaction.Scrubber.scrub(Scrubber.java:199)	at org.apache.cassandra.db.compaction.CompactionManager.scrubOne(CompactionManager.java:443)	at org.apache.cassandra.db.compaction.CompactionManager.doScrub(CompactionManager.java:432)	at org.apache.cassandra.db.compaction.CompactionManager.access$300(CompactionManager.java:62)	at org.apache.cassandra.db.compaction.CompactionManager$3.perform(CompactionManager.java:236)	at org.apache.cassandra.db.compaction.CompactionManager$2.call(CompactionManager.java:222)	at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:334)	at java.util.concurrent.FutureTask.run(FutureTask.java:166)	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)	at java.lang.Thread.run(Thread.java:724)