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The "StorageConfiguration" page has been changed by JonHermes. http://wiki.apache.org/cassandra/StorageConfiguration?action=diff&rev1=20&rev2=21 -------------------------------------------------- Prior to the 0.7 release, Cassandra storage configuration is described by the ''conf/storage-conf.xml'' file. As of 0.7, it is described by the ''conf/cassandra.yaml'' file. == config-converter == - To convert a working storage-conf.xml into yaml, bin/config-converter will complete a best-effort conversion. It assumes that your xml file is at conf/storage-conf.xml, and it will overwrite the file. Note though that the scope of many properties have changed (<EndPointSnitch> is global instead of per-KS, <GCGraceSeconds> is per-KS instead of global, etc.), so config-converter will not produce the exact same file. + To convert a working storage-conf.xml into yaml, bin/config-converter will complete a best-effort conversion. It assumes that your xml file is at conf/storage-conf.xml, and it will overwrite the file. Note though that the scope of many properties have changed (endpoint_snitch is global instead of per-KS, gc_grace_seconds is per-KS instead of global, etc.), so the generated yaml will undoubtedly need to be looked over. == -Dcassandra.config == You can specify any configuration to load by passing a VM parameter to java when Cassandra starts up. This is done by supplying a value to ''-Dcassandra.conf=<your value here>''. Values can include files located in the classpath or local and remote URLs. Here are a few valid examples: @@ -282, +282 @@ {{{ <BinaryMemtableSizeInMB>256</BinaryMemtableSizeInMB> }}} - == Including Configuration Fragments == - It's common that a Cassandra configuration will be shared among many machines but needs to be slightly tuned on each one (directories are different, memory available is less, etc.). You can include a XML fragment with this syntax. - {{{ - ... - <!DOCTYPE storage [ - <!-- include all these entities from external files--> - <!ENTITY seeds SYSTEM "seeds.xml"> - <!ENTITY directories SYSTEM "directories.xml"> - <!ENTITY network SYSTEM "network.xml"> - <!ENTITY tuning SYSTEM "tuning.xml"> - ]> - ... - <Storage> - ... - &seeds; - &directories; - &network; - &tuning; - ... - </Storage> - }}} - And then the external files are simply what you'd specify inline, for example directories.xml. Note these fragments are not valid XML alone. - - {{{ - <CommitLogDirectory>/var/lib/cassandra/commitlog</CommitLogDirectory> - <DataFileDirectories> - <DataFileDirectory>/var/lib/cassandra/data</DataFileDirectory> - </DataFileDirectories> - <StagingFileDirectory>/var/lib/cassandra/staging</StagingFileDirectory> - }}} -
