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From Jonathan Ellis <jbel...@gmail.com>
Subject Re: File write errors but cassandra isn't crashing
Date Mon, 16 Aug 2010 15:51:32 GMT
That's a tough call -- you can also come up with scenarios where you'd
rather have it read-only than completely dead.

On Wed, Aug 11, 2010 at 12:38 PM, Ran Tavory <rantav@gmail.com> wrote:
> 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



-- 
Jonathan Ellis
Project Chair, Apache Cassandra
co-founder of Riptano, the source for professional Cassandra support
http://riptano.com

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