我使用的是Cassnara2.1.13单节点集群，数据库运行良好，没有任何问题。
然后出现了以下异常，因为cassandra服务被关闭了。
在单节点集群中，这些异常（特别是同步失败）的原因是什么？有什么提示或指针可以找到问题的根本原因吗？
信息[memtablefl]ushwriter:22]记忆表。java:347 - 写作memtable-compaction_history@1884003282（0.521KB序列化字节，19个操作，0%/0%的开/关堆限制）信息[memtableflushwriter:22]记忆表。java:382 - 完成了commitlog位置replayposition的刷新/myspace/db/data/system/compression\u history-b4dbb7b4dc493fb5b3bfce6e434832ca/system-compression\u history-tmp-ka-8-data.db（0.000kib）（segmentid=1540762960100，位置=2642365）错误[memtableflushwriter:21]Cassandra德蒙。java:229 - 线程[memtablefl]中出现异常ushwriter:21,5,main]org.apache.cassandra.io.fswriteerror:java.io.syncfailedexception:sync failed at org.apache.cassandra.io.util.sequentialwriter.syncdataonlyinternal（sequentialwriter。java:254)~[apache-cassandra-2.1.13。jar:2.1.13]在org.apache.cassandra.io.util.sequentialwriter.syncinternal（sequentialwriter。java:263)~[apache-cassandra-2.1.13。jar:2.1.13]在org.apache.cassandra.io.util.sequentialwriter.close（sequentialwriter。java:451)~[apache-cassandra-2.1.13。jar:2.1.13]在org.apache.cassandra.io.compress.compressedsequentialwriter.close（compressedsequentialwriter。java:264)~[apache-cassandra-2.1.13。jar:2.1.13]在org.apache.cassandra.io.sstable.sstablewriter.close（sstablewriter。java:503) ~[apache-cassandra-2.1.13。jar:2.1.13]在org.apache.cassandra.io.sstable.sstablewriter.finish（sstablewriter。java:455)~[apache-cassandra-2.1.13。jar:2.1.13]在org.apache.cassandra.io.sstable.sstablewriter.closeandopenreader（sstablewriter。java:447)~[apache-cassandra-2.1.13。jar:2.1.13]在org.apache.cassandra.io.sstable.sstablewriter.closeandopenreader（sstablewriter。java:442)~[apache-cassandra-2.1.13。jar:2.1.13]在org.apache.cassandra.db.memtable$flushrunnable.writesortedcontents（memtable。java:389)~[apache-cassandra-2.1.13。jar:2.1.13]在org.apache.cassandra.db.memtable$flushrunnable.runmaythrow（memtable。java:335) ~[apache-cassandra-2.1.13。jar:2.1.13]在org.apache.cassandra.utils.wrappedrunnable.run（wrappedrunnable。java:28)~[apache-cassandra-2.1.13。jar:2.1.13]在com.google.common.util.concurrent.moreexecutors$samethreadexecutorservice.execute（moreexecutors。java:297)~[Guava-16.0。jar:na]在org.apache.cassandra.db.columnfamilystore$flush.run（columnfamilystore。java:1120)~[apache-cassandra-2.1.13。jar:2.1.13]位于java.util.concurrent.threadpoolexecutor.runworker（threadpoolexecutor。java:1149)~[na:1.8.0_]位于java.util.concurrent.threadpoolexecutor$worker.run（threadpoolexecutor。java:624)~（na:1.8.0μ192）在java.lang.thread.run（线程。java:748)~[na:1.8.0_]原因：java.io.syncfailedexception:sync failed at java.io.filedescriptor.sync（本机方法）~[na:1.8.0_]at org.apache.cassandra.io.util.sequentialwriter.syncdataonlyinternal（sequentialwriter）。java:250)~[apache-cassandra-2.1.13。jar:2.1.13] ... 省略15个公共框架
错误[memtablefl]ushwriter:21]存储服务。java:453 - 停止闲聊警告[memtablefl]ushwriter:21]存储服务。java:359 - 通过操作员请求信息停止流言[memtablefl]ushwriter:21]流言蜚语者。java:1455 - 宣布关闭
重新启动cassandra服务后，没有任何问题，并按预期工作。