The cassandra-cli tool will show you, if you're using at least cassandra 1.0.1, in a "describe" command. If not, you can make a thrift describe_keyspace() call some other way, and check the value of the appropriate CfDef's row_cache_provider string. If it's SerializingCacheProvider, it's off-heap. Note that I think you need to create the columnfamily while JNA is present, not just have JNA present when cassandra starts. Might be wrong on that.
p On Thu, Nov 3, 2011 at 4:10 PM, Peter Tillotson <slatem...@yahoo.co.uk>wrote: > Cassandra 1.0.1 and only seemed to happen with > * JAVA_HOME=/usr/lib/jvm/java-6-sun > and jna.jar copied into /usr/share/cassandra(/lib) > > I then saw the detail in the init script and how it was being linked > > Is there a way I can verify which provider is being used? I want to make > sure Off heap is being used in the default config. > > On 03/11/11 19:06, paul cannon wrote: > > I can't reproduce this. What version of the cassandra deb are you using, > > exactly, and why are you symlinking or copying jna.jar into > > /usr/share/cassandra? The initscript should be adding > > /usr/sahre/java/jna.jar to the classpath, and that should be all you > need. > > > > The failure you see with o.a.c.cache.FreeableMemory is not because the > > jre can't find the class, it's just that it can't initialize the class > > (because it needs JNA, and it can't find JNA). > > > > p > > > > On Wed, Nov 2, 2011 at 4:42 AM, Peter Tillotson <slatem...@yahoo.co.uk > > <mailto:slatem...@yahoo.co.uk>> wrote: > > > > see below > > * JAVA_HOME=/usr/lib/jvm/java-6-openjdk > > works > > -- > > Reading the documentation over at Datastax > > “The Debian and RPM packages of Cassandra install JNA automatically” > > > http://www.datastax.com/dev/blog/whats-new-in-cassandra-1-0-improved-memory-and-disk-space-management > > > > And indeed the Debian package depends on jna, and the > > /etc/init.d/cassandra looks as though in adds > > /usr/share/java/jna.jar to the classpath, and here is the but. > > > > If I copy or symlink jna.jar into: > > * /usr/share/cassandra > > * /usr/share/cassandra/lib > > Whenever a column family initialises I get: > > java.lang.NoClassDefFoundError: Could not initialize class > > org.apache.cassandra.cache.FreeableMemory > > > > This suggests to me that: > > 1) By default, for me at least, in Debian jna.jar is not on the > > classpath > > 2) There is an additional classpath issue > > jar -tf apache-cassandra.jar | grep "FreeableMemory" succeeds > > > > I'm running on: > > * Ubuntu 10.04 x64 > > * JAVA_HOME=/usr/lib/jvm/java-6-sun > > > > Full stack traces: > > java.lang.NoClassDefFoundError: Could not initialize class > > com.sun.jna.Native > > at com.sun.jna.Pointer.<clinit>(Pointer.java:42) > > at > > > org.apache.cassandra.cache.SerializingCache.serialize(SerializingCache.java:92) > > at > > > org.apache.cassandra.cache.SerializingCache.put(SerializingCache.java:154) > > at > > > org.apache.cassandra.cache.InstrumentingCache.put(InstrumentingCache.java:63) > > at > > > org.apache.cassandra.db.ColumnFamilyStore.cacheRow(ColumnFamilyStore.java:1150) > > at > > > org.apache.cassandra.db.ColumnFamilyStore.getColumnFamily(ColumnFamilyStore.java:1174) > > at > > > org.apache.cassandra.db.ColumnFamilyStore.getColumnFamily(ColumnFamilyStore.java:1131) > > at org.apache.cassandra.db.Table.getRow(Table.java:378) > > at > > > org.apache.cassandra.db.SliceFromReadCommand.getRow(SliceFromReadCommand.java:61) > > at > > > org.apache.cassandra.service.StorageProxy$LocalReadRunnable.runMayThrow(StorageProxy.java:797) > > at > > > org.apache.cassandra.service.StorageProxy$DroppableRunnable.run(StorageProxy.java:1265) > > at > > > java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886) > > at > > > java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908) > > at java.lang.Thread.run(Thread.java:662) > > INFO [pool-1-thread-1] 2011-11-02 10:26:46,738 Memtable.java (line > > 177) CFS(Keyspace='BigSet', ColumnFamily='theKeys') liveRatio is > > 18.20062753783684 (just-counted was 16.960966424636872). > > calculation took 408ms for 8169 columns > > ERROR [ReadStage:33] 2011-11-02 10:26:56,599 > > AbstractCassandraDaemon.java (line 133) Fatal exception in thread > > Thread[ReadStage:33,5,main] > > java.lang.NoClassDefFoundError: Could not initialize class > > org.apache.cassandra.cache.FreeableMemory > > at > > > org.apache.cassandra.cache.SerializingCache.serialize(SerializingCache.java:92) > > at > > > org.apache.cassandra.cache.SerializingCache.put(SerializingCache.java:154) > > at > > > org.apache.cassandra.cache.InstrumentingCache.put(InstrumentingCache.java:63) > > at > > > org.apache.cassandra.db.ColumnFamilyStore.cacheRow(ColumnFamilyStore.java:1150) > > at > > > org.apache.cassandra.db.ColumnFamilyStore.getColumnFamily(ColumnFamilyStore.java:1174) > > at > > > org.apache.cassandra.db.ColumnFamilyStore.getColumnFamily(ColumnFamilyStore.java:1131) > > at org.apache.cassandra.db.Table.getRow(Table.java:378) > > at > > > org.apache.cassandra.db.SliceFromReadCommand.getRow(SliceFromReadCommand.java:61) > > at > > > org.apache.cassandra.service.StorageProxy$LocalReadRunnable.runMayThrow(StorageProxy.java:797) > > at > > > org.apache.cassandra.service.StorageProxy$DroppableRunnable.run(StorageProxy.java:1265) > > at > > > java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886) > > > > > >
