When I kill cassandra and restart I keep seeing the following error message. Is this something I should be concerned about?

I though killing cassandra via kill $PID was somewhat "safe"???

Thanks

Switching to ParallelGC to avoid CMS/CompressedOops incompatibility
INFO 17:05:08,680 DiskAccessMode isstandard, indexAccessMode is mmap
INFO 17:05:08,786 Sampling index for /var/lib/cassandra/data/system/Schema-e-1-<> INFO 17:05:08,797 Sampling index for /var/lib/cassandra/data/system/Schema-e-2-<> INFO 17:05:08,807 Sampling index for /var/lib/cassandra/data/system/Migrations-e-1-<> INFO 17:05:08,833 Sampling index for /var/lib/cassandra/data/system/Schema-e-1-<> INFO 17:05:08,834 Sampling index for /var/lib/cassandra/data/system/Schema-e-2-<> INFO 17:05:08,839 Sampling index for /var/lib/cassandra/data/system/Migrations-e-1-<> INFO 17:05:08,862 Sampling index for /var/lib/cassandra/data/system/Schema-e-1-<> INFO 17:05:08,864 Sampling index for /var/lib/cassandra/data/system/Schema-e-2-<> INFO 17:05:08,876 Sampling index for /var/lib/cassandra/data/system/Migrations-e-1-<> INFO 17:05:08,885 Sampling index for /var/lib/cassandra/data/system/LocationInfo-e-17-<> INFO 17:05:08,892 Sampling index for /var/lib/cassandra/data/system/Schema-e-1-<> INFO 17:05:08,893 Sampling index for /var/lib/cassandra/data/system/Schema-e-2-<> INFO 17:05:08,897 Sampling index for /var/lib/cassandra/data/system/Migrations-e-1-<> INFO 17:05:08,901 Sampling index for /var/lib/cassandra/data/system/LocationInfo-e-17-<> INFO 17:05:08,906 Sampling index for /var/lib/cassandra/data/system/Schema-e-1-<> INFO 17:05:08,909 Sampling index for /var/lib/cassandra/data/system/Schema-e-2-<> INFO 17:05:08,918 Sampling index for /var/lib/cassandra/data/system/Migrations-e-1-<> INFO 17:05:08,922 Sampling index for /var/lib/cassandra/data/system/LocationInfo-e-17-<> INFO 17:05:08,928 Creating new commitlog segment /var/lib/cassandra/commitlog/CommitLog-1281571508928.log INFO 17:05:08,933 Deleted /var/lib/cassandra/data/system/LocationInfo-e-16-Data.db INFO 17:05:08,936 Deleted /var/lib/cassandra/data/system/LocationInfo-e-15-Data.db INFO 17:05:08,936 Sampling index for /var/lib/cassandra/data/system/LocationInfo-e-16-<> ERROR 17:05:08,937 Corrupt file /var/lib/cassandra/data/system/LocationInfo-e-16-Data.db; skipped java.io.FileNotFoundException: /var/lib/cassandra/data/system/LocationInfo-e-16-Index.db (No such file or directory)
    at java.io.RandomAccessFile.open(Native Method)
    at java.io.RandomAccessFile.<init>(RandomAccessFile.java:212)
    at java.io.RandomAccessFile.<init>(RandomAccessFile.java:98)
at org.apache.cassandra.io.util.BufferedRandomAccessFile.<init>(BufferedRandomAccessFile.java:142) at org.apache.cassandra.io.util.BufferedRandomAccessFile.<init>(BufferedRandomAccessFile.java:137) at org.apache.cassandra.io.sstable.SSTableReader.load(SSTableReader.java:289) at org.apache.cassandra.io.sstable.SSTableReader.internalOpen(SSTableReader.java:197) at org.apache.cassandra.io.sstable.SSTableReader.open(SSTableReader.java:176) at org.apache.cassandra.db.ColumnFamilyStore.<init>(ColumnFamilyStore.java:208) at org.apache.cassandra.db.ColumnFamilyStore.createColumnFamilyStore(ColumnFamilyStore.java:342) at org.apache.cassandra.db.ColumnFamilyStore.createColumnFamilyStore(ColumnFamilyStore.java:308)
    at org.apache.cassandra.db.Table.<init>(Table.java:245)
    at org.apache.cassandra.db.Table.open(Table.java:102)
    at org.apache.cassandra.db.RowMutation.apply(RowMutation.java:196)
at org.apache.cassandra.db.StatisticsTable.deleteSSTableStatistics(StatisticsTable.java:81) at org.apache.cassandra.io.sstable.SSTable.deleteIfCompacted(SSTable.java:136) at org.apache.cassandra.db.ColumnFamilyStore.<init>(ColumnFamilyStore.java:202) at org.apache.cassandra.db.ColumnFamilyStore.createColumnFamilyStore(ColumnFamilyStore.java:342) at org.apache.cassandra.db.ColumnFamilyStore.createColumnFamilyStore(ColumnFamilyStore.java:308)
    at org.apache.cassandra.db.Table.<init>(Table.java:245)
    at org.apache.cassandra.db.Table.open(Table.java:102)
    at org.apache.cassandra.db.RowMutation.apply(RowMutation.java:196)
at org.apache.cassandra.db.StatisticsTable.deleteSSTableStatistics(StatisticsTable.java:81) at org.apache.cassandra.io.sstable.SSTable.deleteIfCompacted(SSTable.java:136) at org.apache.cassandra.db.ColumnFamilyStore.<init>(ColumnFamilyStore.java:202) at org.apache.cassandra.db.ColumnFamilyStore.createColumnFamilyStore(ColumnFamilyStore.java:342) at org.apache.cassandra.db.ColumnFamilyStore.createColumnFamilyStore(ColumnFamilyStore.java:308)
    at org.apache.cassandra.db.Table.<init>(Table.java:245)
    at org.apache.cassandra.db.Table.open(Table.java:102)
at org.apache.cassandra.db.SystemTable.checkHealth(SystemTable.java:121) at org.apache.cassandra.thrift.CassandraDaemon.setup(CassandraDaemon.java:93) at org.apache.cassandra.service.AbstractCassandraDaemon.activate(AbstractCassandraDaemon.java:90) at org.apache.cassandra.thrift.CassandraDaemon.main(CassandraDaemon.java:224) INFO 17:05:08,947 Deleted /var/lib/cassandra/data/system/LocationInfo-e-14-Data.db INFO 17:05:08,947 Sampling index for /var/lib/cassandra/data/system/LocationInfo-e-17-<> INFO 17:05:08,948 Sampling index for /var/lib/cassandra/data/system/LocationInfo-e-15-<> ERROR 17:05:08,948 Corrupt file /var/lib/cassandra/data/system/LocationInfo-e-15-Data.db; skipped java.io.FileNotFoundException: /var/lib/cassandra/data/system/LocationInfo-e-15-Index.db (No such file or directory)
    at java.io.RandomAccessFile.open(Native Method)
    at java.io.RandomAccessFile.<init>(RandomAccessFile.java:212)
    at java.io.RandomAccessFile.<init>(RandomAccessFile.java:98)
at org.apache.cassandra.io.util.BufferedRandomAccessFile.<init>(BufferedRandomAccessFile.java:142) at org.apache.cassandra.io.util.BufferedRandomAccessFile.<init>(BufferedRandomAccessFile.java:137) at org.apache.cassandra.io.sstable.SSTableReader.load(SSTableReader.java:289) at org.apache.cassandra.io.sstable.SSTableReader.internalOpen(SSTableReader.java:197) at org.apache.cassandra.io.sstable.SSTableReader.open(SSTableReader.java:176) at org.apache.cassandra.db.ColumnFamilyStore.<init>(ColumnFamilyStore.java:208) at org.apache.cassandra.db.ColumnFamilyStore.createColumnFamilyStore(ColumnFamilyStore.java:342) at org.apache.cassandra.db.ColumnFamilyStore.createColumnFamilyStore(ColumnFamilyStore.java:308)
    at org.apache.cassandra.db.Table.<init>(Table.java:245)
    at org.apache.cassandra.db.Table.open(Table.java:102)
    at org.apache.cassandra.db.RowMutation.apply(RowMutation.java:196)
at org.apache.cassandra.db.StatisticsTable.deleteSSTableStatistics(StatisticsTable.java:81) at org.apache.cassandra.io.sstable.SSTable.deleteIfCompacted(SSTable.java:136) at org.apache.cassandra.db.ColumnFamilyStore.<init>(ColumnFamilyStore.java:202) at org.apache.cassandra.db.ColumnFamilyStore.createColumnFamilyStore(ColumnFamilyStore.java:342) at org.apache.cassandra.db.ColumnFamilyStore.createColumnFamilyStore(ColumnFamilyStore.java:308)
    at org.apache.cassandra.db.Table.<init>(Table.java:245)
    at org.apache.cassandra.db.Table.open(Table.java:102)
at org.apache.cassandra.db.SystemTable.checkHealth(SystemTable.java:121) at org.apache.cassandra.thrift.CassandraDaemon.setup(CassandraDaemon.java:93) at org.apache.cassandra.service.AbstractCassandraDaemon.activate(AbstractCassandraDaemon.java:90) at org.apache.cassandra.thrift.CassandraDaemon.main(CassandraDaemon.java:224) INFO 17:05:08,950 Sampling index for /var/lib/cassandra/data/system/LocationInfo-e-16-<> ERROR 17:05:08,951 Corrupt file /var/lib/cassandra/data/system/LocationInfo-e-16-Data.db; skipped java.io.FileNotFoundException: /var/lib/cassandra/data/system/LocationInfo-e-16-Index.db (No such file or directory)
    at java.io.RandomAccessFile.open(Native Method)
    at java.io.RandomAccessFile.<init>(RandomAccessFile.java:212)
    at java.io.RandomAccessFile.<init>(RandomAccessFile.java:98)
at org.apache.cassandra.io.util.BufferedRandomAccessFile.<init>(BufferedRandomAccessFile.java:142) at org.apache.cassandra.io.util.BufferedRandomAccessFile.<init>(BufferedRandomAccessFile.java:137) at org.apache.cassandra.io.sstable.SSTableReader.load(SSTableReader.java:289) at org.apache.cassandra.io.sstable.SSTableReader.internalOpen(SSTableReader.java:197) at org.apache.cassandra.io.sstable.SSTableReader.open(SSTableReader.java:176) at org.apache.cassandra.db.ColumnFamilyStore.<init>(ColumnFamilyStore.java:208) at org.apache.cassandra.db.ColumnFamilyStore.createColumnFamilyStore(ColumnFamilyStore.java:342) at org.apache.cassandra.db.ColumnFamilyStore.createColumnFamilyStore(ColumnFamilyStore.java:308)
    at org.apache.cassandra.db.Table.<init>(Table.java:245)
    at org.apache.cassandra.db.Table.open(Table.java:102)
    at org.apache.cassandra.db.RowMutation.apply(RowMutation.java:196)
at org.apache.cassandra.db.StatisticsTable.deleteSSTableStatistics(StatisticsTable.java:81) at org.apache.cassandra.io.sstable.SSTable.deleteIfCompacted(SSTable.java:136) at org.apache.cassandra.db.ColumnFamilyStore.<init>(ColumnFamilyStore.java:202) at org.apache.cassandra.db.ColumnFamilyStore.createColumnFamilyStore(ColumnFamilyStore.java:342) at org.apache.cassandra.db.ColumnFamilyStore.createColumnFamilyStore(ColumnFamilyStore.java:308)
    at org.apache.cassandra.db.Table.<init>(Table.java:245)
    at org.apache.cassandra.db.Table.open(Table.java:102)
at org.apache.cassandra.db.SystemTable.checkHealth(SystemTable.java:121) at org.apache.cassandra.thrift.CassandraDaemon.setup(CassandraDaemon.java:93) at org.apache.cassandra.service.AbstractCassandraDaemon.activate(AbstractCassandraDaemon.java:90) at org.apache.cassandra.thrift.CassandraDaemon.main(CassandraDaemon.java:224) INFO 17:05:08,970 Deleted /var/lib/cassandra/data/system/LocationInfo-e-13-Data.db INFO 17:05:08,971 Sampling index for /var/lib/cassandra/data/system/LocationInfo-e-14-<> ERROR 17:05:08,971 Corrupt file /var/lib/cassandra/data/system/LocationInfo-e-14-Data.db; skipped java.io.FileNotFoundException: /var/lib/cassandra/data/system/LocationInfo-e-14-Index.db (No such file or directory)
    at java.io.RandomAccessFile.open(Native Method)
    at java.io.RandomAccessFile.<init>(RandomAccessFile.java:212)
    at java.io.RandomAccessFile.<init>(RandomAccessFile.java:98)
at org.apache.cassandra.io.util.BufferedRandomAccessFile.<init>(BufferedRandomAccessFile.java:142) at org.apache.cassandra.io.util.BufferedRandomAccessFile.<init>(BufferedRandomAccessFile.java:137) at org.apache.cassandra.io.sstable.SSTableReader.load(SSTableReader.java:289) at org.apache.cassandra.io.sstable.SSTableReader.internalOpen(SSTableReader.java:197) at org.apache.cassandra.io.sstable.SSTableReader.open(SSTableReader.java:176) at org.apache.cassandra.db.ColumnFamilyStore.<init>(ColumnFamilyStore.java:208) at org.apache.cassandra.db.ColumnFamilyStore.createColumnFamilyStore(ColumnFamilyStore.java:342) at org.apache.cassandra.db.ColumnFamilyStore.createColumnFamilyStore(ColumnFamilyStore.java:308)
    at org.apache.cassandra.db.Table.<init>(Table.java:245)
    at org.apache.cassandra.db.Table.open(Table.java:102)
at org.apache.cassandra.db.SystemTable.checkHealth(SystemTable.java:121) at org.apache.cassandra.thrift.CassandraDaemon.setup(CassandraDaemon.java:93) at org.apache.cassandra.service.AbstractCassandraDaemon.activate(AbstractCassandraDaemon.java:90) at org.apache.cassandra.thrift.CassandraDaemon.main(CassandraDaemon.java:224) INFO 17:05:08,972 Sampling index for /var/lib/cassandra/data/system/LocationInfo-e-17-<> INFO 17:05:08,973 Sampling index for /var/lib/cassandra/data/system/LocationInfo-e-15-<> ERROR 17:05:08,973 Corrupt file /var/lib/cassandra/data/system/LocationInfo-e-15-Data.db; skipped java.io.FileNotFoundException: /var/lib/cassandra/data/system/LocationInfo-e-15-Index.db (No such file or directory)
    at java.io.RandomAccessFile.open(Native Method)
    at java.io.RandomAccessFile.<init>(RandomAccessFile.java:212)
    at java.io.RandomAccessFile.<init>(RandomAccessFile.java:98)
at org.apache.cassandra.io.util.BufferedRandomAccessFile.<init>(BufferedRandomAccessFile.java:142) at org.apache.cassandra.io.util.BufferedRandomAccessFile.<init>(BufferedRandomAccessFile.java:137) at org.apache.cassandra.io.sstable.SSTableReader.load(SSTableReader.java:289) at org.apache.cassandra.io.sstable.SSTableReader.internalOpen(SSTableReader.java:197) at org.apache.cassandra.io.sstable.SSTableReader.open(SSTableReader.java:176) at org.apache.cassandra.db.ColumnFamilyStore.<init>(ColumnFamilyStore.java:208) at org.apache.cassandra.db.ColumnFamilyStore.createColumnFamilyStore(ColumnFamilyStore.java:342) at org.apache.cassandra.db.ColumnFamilyStore.createColumnFamilyStore(ColumnFamilyStore.java:308)
    at org.apache.cassandra.db.Table.<init>(Table.java:245)
    at org.apache.cassandra.db.Table.open(Table.java:102)
at org.apache.cassandra.db.SystemTable.checkHealth(SystemTable.java:121) at org.apache.cassandra.thrift.CassandraDaemon.setup(CassandraDaemon.java:93) at org.apache.cassandra.service.AbstractCassandraDaemon.activate(AbstractCassandraDaemon.java:90) at org.apache.cassandra.thrift.CassandraDaemon.main(CassandraDaemon.java:224) INFO 17:05:08,974 Sampling index for /var/lib/cassandra/data/system/LocationInfo-e-16-<> ERROR 17:05:08,974 Corrupt file /var/lib/cassandra/data/system/LocationInfo-e-16-Data.db; skipped java.io.FileNotFoundException: /var/lib/cassandra/data/system/LocationInfo-e-16-Index.db (No such file or directory)
    at java.io.RandomAccessFile.open(Native Method)
    at java.io.RandomAccessFile.<init>(RandomAccessFile.java:212)
    at java.io.RandomAccessFile.<init>(RandomAccessFile.java:98)
at org.apache.cassandra.io.util.BufferedRandomAccessFile.<init>(BufferedRandomAccessFile.java:142) at org.apache.cassandra.io.util.BufferedRandomAccessFile.<init>(BufferedRandomAccessFile.java:137) at org.apache.cassandra.io.sstable.SSTableReader.load(SSTableReader.java:289) at org.apache.cassandra.io.sstable.SSTableReader.internalOpen(SSTableReader.java:197) at org.apache.cassandra.io.sstable.SSTableReader.open(SSTableReader.java:176) at org.apache.cassandra.db.ColumnFamilyStore.<init>(ColumnFamilyStore.java:208) at org.apache.cassandra.db.ColumnFamilyStore.createColumnFamilyStore(ColumnFamilyStore.java:342) at org.apache.cassandra.db.ColumnFamilyStore.createColumnFamilyStore(ColumnFamilyStore.java:308)
    at org.apache.cassandra.db.Table.<init>(Table.java:245)
    at org.apache.cassandra.db.Table.open(Table.java:102)
at org.apache.cassandra.db.SystemTable.checkHealth(SystemTable.java:121) at org.apache.cassandra.thrift.CassandraDaemon.setup(CassandraDaemon.java:93) at org.apache.cassandra.service.AbstractCassandraDaemon.activate(AbstractCassandraDaemon.java:90) at org.apache.cassandra.thrift.CassandraDaemon.main(CassandraDaemon.java:224) INFO 17:05:08,996 Loading schema version acc5646a-a59d-11df-83fb-e700f669bcfc WARN 17:05:09,158 Schema definitions were defined both locally and in cassandra.yaml. Definitions in cassandra.yaml were ignored. INFO 17:05:09,164 Replaying /var/lib/cassandra/commitlog/CommitLog-1281571453475.log, /var/lib/cassandra/commitlog/CommitLog-1281571508928.log INFO 17:05:09,172 Finished reading /var/lib/cassandra/commitlog/CommitLog-1281571453475.log INFO 17:05:09,172 Finished reading /var/lib/cassandra/commitlog/CommitLog-1281571508928.log INFO 17:05:09,173 switching in a fresh Memtable for LocationInfo at CommitLogContext(file='/var/lib/cassandra/commitlog/CommitLog-1281571508928.log', position=592) INFO 17:05:09,183 Enqueuing flush of memtable-locationi...@137493297(17 bytes, 1 operations) INFO 17:05:09,183 Writing memtable-locationi...@137493297(17 bytes, 1 operations) INFO 17:05:09,184 switching in a fresh Memtable for Statistics at CommitLogContext(file='/var/lib/cassandra/commitlog/CommitLog-1281571508928.log', position=592) INFO 17:05:09,184 Enqueuing flush of memtable-statist...@86823325(0 bytes, 0 operations) INFO 17:05:09,265 Completed flushing /var/lib/cassandra/data/system/LocationInfo-e-18-Data.db INFO 17:05:09,273 Writing memtable-statist...@86823325(0 bytes, 0 operations) INFO 17:05:09,352 Completed flushing /var/lib/cassandra/data/system/Statistics-e-1-Data.db
 INFO 17:05:09,353 Recovery complete
....

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