What does this ERROR message mean?

This error message indicates that some sstable operation either cannot be salvaged from the progress transaction log after a failure or cannot be verified as having completed successfully.

Why does this error occur

For all sstable operations Cassandra logs progress in a transaction log file on local disk. When using JBOD disk configuration, the log is replicated to all available disks.

This particular error would only occur when using JBOD disk configuration either due to a data disk failure or DSE process crash, which would cause an inconsistency between the replicated transaction log files.

How do you fix this ERROR?

Whether this error is harmless or something to worry about depends on the operation it pertains to.

If it is encountered on startup and DSE is failing to start as a result, the accompanying parent exception (CorruptTransactionLogException) will reference the name of the transaction file that is corrupt. To allow DSE to start, backup and remove the referenced transaction file along with the related sstable files sharing the same prefix.

Please contact Datastax Support to determine the implications of this error and next steps.