Nutanix の Cassandra をのぞいてみました。
CVM のバージョンはこれです。
nutanix@NTNX-ae6619e0-A-CVM:10.1.1.21:~$ cat /etc/nutanix/svm-version 4.6r11
cassandra-cli でを起動して、
nutanix@NTNX-ae6619e0-A-CVM:10.1.1.21:~$ cassandra-cli Welcome to cassandra CLI. Type 'help;' or '?' for help. Type 'quit;' or 'exit;' to quit. [default@unknown]
localhost の 9160番ポートに接続します。
[default@unknown] connect localhost/9160; Connected to: "7427652206174240679" on localhost/9160
ためしに、「pithos」という名前のキースペースに接続してみました。
[default@unknown] use pithos; Authenticated to keyspace: pithos [default@pithos]
ちなみに、Nutanix Bible によれば、Pithos は Nutanix の仮想ディスクの構成データを管理していて、Cassandra 上に構築されているようです。
※下記の、パートIII. Acropolis → クラスタ コンポーネント → Pithos あたりを参照。
pithos キースペースには、「cf」という名前のカラムファミリがあります。
[default@pithos] describe keyspace pithos;
Keyspace: pithos:
Replication Strategy: org.apache.cassandra.locator.SimpleStrategy
Replication Factor: 1
Column Families:
ColumnFamily: cf
default_validation_class: org.apache.cassandra.db.marshal.BytesType
Columns sorted by: org.apache.cassandra.db.marshal.AsciiType
Row cache size (entries) / save period in seconds: 0.0/0
Key cache size / save period in seconds: 5000.0/14400
Memtable thresholds: 1.0/32/30 (millions of ops/minutes/MB)
GC grace seconds: 120
Compaction min/max thresholds: 2/32
Max sstables allowed: 6
Read repair chance: 0.0
Built indexes: []
「cf」カラムファミリを 5行だけ見てみます。
中身は正直よくわかりませんでした・・・
[default@pithos] list cf limit 5; ------------------- RowKey: acropolis.addr_mac:52:54:00:10:9d:72 => (column=data, value=0a06525400109d721204c0a800051a10b57a9d487b22458b9b342de60a190a662210d637bbe0ad664725ba65a91ac25f0ea93001, timestamp=1465023942030266) ------------------- RowKey: acropolis.addr_mac:52:54:00:89:ff:7a => (column=data, value=0a0652540089ff7a12040a0101051a107a5969b042604ecf9ff4f2a804f992282210d637bbe0ad664725ba65a91ac25f0ea93001, timestamp=1464909678739082) ------------------- RowKey: acropolis.host_uuid:Jtt5PrqjQJmHgGqnmJ9aIQ== => (column=data, value=0a1026db793ebaa3409987806aa7989f5a2128aa1430c8dd1f38f3c83740014a0573737365334a076c6168665f6c6d4a04637831364a06737365342e314a06737365342e324a06706f70636e744a036165734a0870636c6d756c64714a067832617069634a0c7473632d646561646c696e654a0578736176654a036176784a067264747363704a0465726d734a04736d65704a0866736773626173654a0a68797065727669736f724a06726472616e644a04663136634a076f7378736176654a04706369644a0268744a03766d65, timestamp=1465038341052544) ------------------- RowKey: acropolis.image_uuid:ApBDiHqSTA2UasKHb/nd1Q== => (column=data, value=0a10029043887a924c0d946ac2876ff9ddd51206436972726f731a00200128044802521090ae4b70df9e4bd39c8a8420428116a35801616a34a425db33050069ae65e225db330500, timestamp=1464391251071908) ------------------- RowKey: acropolis.image_uuid:IIYQ2Sm2RdGQ/2egTjf6Ww== => (column=data, value=0a10208610d929b645d190ff67a04e37fa5b12036f6c371a0020022804480252101b5336b1d8bb4f03a73d42e9c1c403a3580161b89cf5285334050069f24a412953340500, timestamp=1464906987042594) 5 Rows Returned.
cassandra-cli を終了します。
[default@pithos] quit; nutanix@NTNX-ae6619e0-A-CVM:10.1.1.21:~$
keyspace と Column Family の名前から、ある程度はどのような情報が Cassandra で管理されているのかわかるかもしれません。コマンドを記載したファイルを用意して、cassandra-cli を実行します。
nutanix@NTNX-ae6619e0-A-CVM:10.1.1.21:~$ cat cmd.txt connect localhost/9160; show keyspaces; quit;
実行結果の出力が多いので、grep でざっくりフィルタしてみました。
nutanix@NTNX-ae6619e0-A-CVM:10.1.1.21:~$ cat cmd.txt | cassandra-cli | grep -A1 -e "Keyspace" -e "Column*Fam" | grep -v default_validation_class | grep -v -e '^-' -e "Replication Strategy"
Keyspace: alerts_index_keyspace:
ColumnFamily: alerts_index_cf
Keyspace: alerts_keyspace:
ColumnFamily: alerts_cf
Keyspace: arithmos:
ColumnFamily: historical_stats
ColumnFamily: persist_files
Keyspace: deduped_obj_store:
ColumnFamily: control_block
ColumnFamily: value
Keyspace: default_WAL_keyspace:
ColumnFamily: default_WAL_cf
ColumnFamily: default_WAL_paxos_cf
Keyspace: default_WAL_metadata_keyspace:
ColumnFamily: default_WAL_metadata_cf
ColumnFamily: default_WAL_metadata_paxos_cf
Keyspace: insights:
ColumnFamily: entity_trail
"Entity time series trail records"
ColumnFamily: entity_trail_snapshot_history
"record of snapshots for the entity trail"
ColumnFamily: latest_entities
"Current entities"
ColumnFamily: registered_entity_types
"Entity Type meta data"
ColumnFamily: registered_metric_types
"Metric meta data"
Keyspace: insights_metric_data:
ColumnFamily: metric_data_by_entity
"Metric time series data for one entity, one metric"
ColumnFamily: metric_data_by_entity_ds
"Metric time series downsampled data for entity, metric"
ColumnFamily: metric_data_by_shard
"Metric time series data for all entities in the shard"
ColumnFamily: metric_data_by_shard_ds
"Metric time series downsampled data for all entities in shard"
Keyspace: medusa_extentgroupaccessdatamap:
ColumnFamily: extentgroupaccessdatamap
"Auto-created column family"
Keyspace: medusa_extentgroupidmap:
ColumnFamily: extentgroupidmap
"Auto-created column family"
ColumnFamily: extentgroupidmap_row_cas_cf
"Auto-created column family"
Keyspace: medusa_extentidmap:
ColumnFamily: extentidmap
"Auto-created column family"
Keyspace: medusa_nfsmap:
ColumnFamily: nfsmap
"Auto-created column family"
Keyspace: medusa_smbfileidmap:
ColumnFamily: smbfileidmap
"Auto-created column family"
Keyspace: medusa_vdiskblockmap:
ColumnFamily: vdiskblockmap
"Auto-created column family"
Keyspace: medusa_vdiskoplogmap:
ColumnFamily: vdiskoplogmap
"Auto-created column family"
Keyspace: pithos:
ColumnFamily: cf
Keyspace: plan_mgr:
ColumnFamily: completed_backup
ColumnFamily: completed_job
ColumnFamily: running_backup
ColumnFamily: running_job
Keyspace: stats:
ColumnFamily: stats_historical
ColumnFamily: stats_realtime
ColumnFamily: stats_sampling_periods
Keyspace: system:
ColumnFamily: HintsColumnFamily (Super)
"hinted handoff data"
ColumnFamily: IndexInfo
"indexes that have been completed"
ColumnFamily: LocationInfo
"persistent metadata for the local node"
ColumnFamily: Migrations
"individual schema mutations"
ColumnFamily: Schema
"current state of the schema"
nutanix@NTNX-ae6619e0-A-CVM:10.1.1.21:~$
以上。
