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From Ran Tavory <ran...@gmail.com>
Subject File write errors but cassandra isn't crashing
Date Wed, 11 Aug 2010 17:38:56 GMT
Due to administrative error one of the hosts in the cluster lost permission
to write to it's data directory.
So I started seeing errors in the log, however, the server continued serving
traffic. It wasn't able to compact and do other write operations but it
didn't crash.
I was wondering wether that's by design and if so, is this a good one... I
guess I want to know if really bad things happen to my cluster...

logs look like that...

 INFO [FLUSH-TIMER] 2010-08-11 07:53:14,683 ColumnFamilyStore.java (line
357) KvAds has reached its threshold; switching in a fresh Memtable at
CommitLogContext(file='/outbrain/cassandra/commitlog/Commi
tLog-1281505164614.log', position=88521163)
 INFO [FLUSH-TIMER] 2010-08-11 07:53:14,683 ColumnFamilyStore.java (line
609) Enqueuing flush of Memtable(KvAds)@851225759
 INFO [FLUSH-WRITER-POOL:1] 2010-08-11 07:53:14,684 Memtable.java (line 148)
Writing Memtable(KvAds)@851225759
ERROR [FLUSH-WRITER-POOL:1] 2010-08-11 07:53:14,688
DebuggableThreadPoolExecutor.java (line 94) Error in executor futuretask
*java.util.concurrent.ExecutionException: java.lang.RuntimeException:
java.io.FileNotFoundException:
/outbrain/cassandra/data/outbrain_kvdb/KvAds-tmp-249-Data.db (Permission
denied)
*        at
java.util.concurrent.FutureTask$Sync.innerGet(FutureTask.java:222)
        at java.util.concurrent.FutureTask.get(FutureTask.java:83)
        at
org.apache.cassandra.concurrent.DebuggableThreadPoolExecutor.afterExecute(DebuggableThreadPoolExecutor.java:86)
        at
java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:888)
        at
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
        at java.lang.Thread.run(Thread.java:619)
*Caused by: java.lang.RuntimeException: java.io.FileNotFoundException:
/outbrain/cassandra/data/outbrain_kvdb/KvAds-tmp-249-Data.db (Permission
denied)
*        at
org.apache.cassandra.utils.WrappedRunnable.run(WrappedRunnable.java:34)
        at
java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:441)
        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:886)
... more

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