Cassandra system.log中的错误：java.io.IOException：权限被拒绝

Question

我在所有节点上的完全空白的群集上收到以下例外。那里绝对没有。我没有理由收集。

INFO [FlushWriter:5] 2013-07-18 03:20:05,250 Memtable.java (line 495) Completed flushing /media/ephemeral0/cassandra/data/system/peers/system-peers-ic-7-Data.db (122 bytes) for commitlog position ReplayPosition(segmentId=1372450799758, position=452016) 
ERROR [CompactionExecutor:174] 2013-07-18 05:19:58,505 CassandraDaemon.java (line 175) Exception in thread Thread[CompactionExecutor:174,1,main] 
FSWriteError in /var/lib/cassandra/saved_caches 
     at org.apache.cassandra.io.util.FileUtils.createTempFile(FileUtils.java:92) 
     at org.apache.cassandra.cache.AutoSavingCache$Writer.tempCacheFile(AutoSavingCache.java:295) 
     at org.apache.cassandra.cache.AutoSavingCache$Writer.saveCache(AutoSavingCache.java:254) 
     at org.apache.cassandra.db.compaction.CompactionManager$10.run(CompactionManager.java:838) 
     at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:439) 
     at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:303) 
     at java.util.concurrent.FutureTask.run(FutureTask.java:138) 
     at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:895) 
     at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:918) 
     at java.lang.Thread.run(Thread.java:662) 
Caused by: java.io.IOException: Permission denied 
     at java.io.UnixFileSystem.createFileExclusively(Native Method) 
     at java.io.File.checkAndCreate(File.java:1705) 
     at java.io.File.createTempFile0(File.java:1726) 
     at java.io.File.createTempFile(File.java:1803) 
     at org.apache.cassandra.io.util.FileUtils.createTempFile(FileUtils.java:88) 
     ... 9 more 

所以，现在当我看到nodetool info节点上我看到，无论是八卦和节俭下跌。

Token   : (invoke with -T/--tokens to see all 256 tokens) 
ID    : 88016797-cd3e-44b6-8086-2dc3298760fb 
Gossip active : false 
Thrift active : false 
Load    : 96.42 KB 
Generation No : 0 
Uptime (seconds) : 1738289 
Heap Memory (MB) : 1180.89/4016.00 
Data Center  : us-west 
Rack    : 1b 
Exceptions  : 120 
Key Cache  : size 2800 (bytes), capacity 104857600 (bytes), 340 hits, 365 requests, NaN recent hit rate, 14400 save period in seconds 
Row Cache  : size 0 (bytes), capacity 0 (bytes), 0 hits, 0 requests, NaN recent hit rate, 0 save period in seconds 

我可以在没有任何问题的情况下从nodetool重新启动它们。任何线索？

Answer 1

“权限被拒绝”是你的冒烟枪。看起来Cassandra没有权限写入您配置的数据目录。