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DamagedWALException: Append requesting roll of WAL

Hi everyone,We have experienced a slowdown on writes and we have seen this error in the rest servers log :
org.apache.hadoop.hbase.regionserver.wal.DamagedWALException: Append 
sequenceId=8689, requesting roll of WAL
I have not seen any issues in the region server or master log files.
A few minutes later the performace got back to normal.
Has anyone experiences such an issue?