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From Benjamin Black...@b3k.us>
Subject Re: File write errors but cassandra isn't crashing
Date Mon, 16 Aug 2010 17:26:46 GMT
Useful config option, perhaps?

On Mon, Aug 16, 2010 at 8:51 AM, Jonathan Ellis <jbellis@gmail.com> wrote:
> 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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