archiving commitlogs after restart fails

RROR [main] 2014-11-03 13:08:59,388 CassandraDaemon.java (line 513) Exception encountered during startup
java.lang.RuntimeException: java.util.concurrent.ExecutionException: java.lang.RuntimeException: java.io.IOException: Exception while executing the command: /bin/ln /var/lib/cassandra/commitlog/CommitLog-3-1413451666161.log /var/lib/cassandra/archive/CommitLog-3-1413451666161.log, command error Code: 1, command output: /bin/ln: failed to create hard link `/var/lib/cassandra/archive/CommitLog-3-1413451666161.log': File exists

        at org.apache.cassandra.db.commitlog.CommitLogArchiver.maybeWaitForArchiving(CommitLogArchiver.java:158)
        at org.apache.cassandra.db.commitlog.CommitLog.recover(CommitLog.java:124)
        at org.apache.cassandra.service.CassandraDaemon.setup(CassandraDaemon.java:336)
        at org.apache.cassandra.service.CassandraDaemon.activate(CassandraDaemon.java:496)
        at org.apache.cassandra.service.CassandraDaemon.main(CassandraDaemon.java:585)
Caused by: java.util.concurrent.ExecutionException: java.lang.RuntimeException: java.io.IOException: Exception while executing the command: /bin/ln /var/lib/cassandra/commitlog/CommitLog-3-1413451666161.log /var/lib/cassandra/archive/CommitLog-3-1413451666161.log, command error Code: 1, command output: /bin/ln: failed to create hard link `/var/lib/cassandra/archive/CommitLog-3-1413451666161.log': File exists

        at java.util.concurrent.FutureTask.report(FutureTask.java:122)
        at java.util.concurrent.FutureTask.get(FutureTask.java:188)
        at org.apache.cassandra.db.commitlog.CommitLogArchiver.maybeWaitForArchiving(CommitLogArchiver.java:145)
        ... 4 more
Caused by: java.lang.RuntimeException: java.io.IOException: Exception while executing the command: /bin/ln /var/lib/cassandra/commitlog/CommitLog-3-1413451666161.log /var/lib/cassandra/archive/CommitLog-3-1413451666161.log, command error Code: 1, command output: /bin/ln: failed to create hard link `/var/lib/cassandra/archive/CommitLog-3-1413451666161.log': File exists

        at com.google.common.base.Throwables.propagate(Throwables.java:160)
        at org.apache.cassandra.utils.WrappedRunnable.run(WrappedRunnable.java:32)
        at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:471)
        at java.util.concurrent.FutureTask.run(FutureTask.java:262)
        at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
        at java.lang.Thread.run(Thread.java:745)
Caused by: java.io.IOException: Exception while executing the command: /bin/ln /var/lib/cassandra/commitlog/CommitLog-3-1413451666161.log /var/lib/cassandra/archive/CommitLog-3-1413451666161.log, command error Code: 1, command output: /bin/ln: failed to create hard link `/var/lib/cassandra/archive/CommitLog-3-1413451666161.log': File exists

        at org.apache.cassandra.utils.FBUtilities.exec(FBUtilities.java:604)
        at org.apache.cassandra.db.commitlog.CommitLogArchiver.exec(CommitLogArchiver.java:197)
        at org.apache.cassandra.db.commitlog.CommitLogArchiver.access$100(CommitLogArchiver.java:44)
        at org.apache.cassandra.db.commitlog.CommitLogArchiver$1.runMayThrow(CommitLogArchiver.java:132)
        at org.apache.cassandra.utils.WrappedRunnable.run(WrappedRunnable.java:28)
        ... 5 more
ERROR [commitlog_archiver:1] 2014-11-03 13:08:59,388 CassandraDaemon.java (line 199) Exception in thread Thread[commitlog_archiver:1,5,main]
java.lang.RuntimeException: java.io.IOException: Exception while executing the command: /bin/ln /var/lib/cassandra/commitlog/CommitLog-3-1413451666161.log /var/lib/cassandra/archive/CommitLog-3-1413451666161.log, command error Code: 1, command output: /bin/ln: failed to create hard link `/var/lib/cassandra/archive/CommitLog-3-1413451666161.log': File exists

        at com.google.common.base.Throwables.propagate(Throwables.java:160)
        at org.apache.cassandra.utils.WrappedRunnable.run(WrappedRunnable.java:32)
        at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:471)
        at java.util.concurrent.FutureTask.run(FutureTask.java:262)
        at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
        at java.lang.Thread.run(Thread.java:745)
Caused by: java.io.IOException: Exception while executing the command: /bin/ln /var/lib/cassandra/commitlog/CommitLog-3-1413451666161.log /var/lib/cassandra/archive/CommitLog-3-1413451666161.log, command error Code: 1, command output: /bin/ln: failed to create hard link `/var/lib/cassandra/archive/CommitLog-3-1413451666161.log': File exists

        at org.apache.cassandra.utils.FBUtilities.exec(FBUtilities.java:604)
        at org.apache.cassandra.db.commitlog.CommitLogArchiver.exec(CommitLogArchiver.java:197)
        at org.apache.cassandra.db.commitlog.CommitLogArchiver.access$100(CommitLogArchiver.java:44)
        at org.apache.cassandra.db.commitlog.CommitLogArchiver$1.runMayThrow(CommitLogArchiver.java:132)
        at org.apache.cassandra.utils.WrappedRunnable.run(WrappedRunnable.java:28)
        ... 5 more