20140704 cassandra introduction @ Xtone, Ltd. Pizza-kai

1. CassandraึṌ䛾ึṌ
2014-­‐07-­‐04
Xtone
䝢䝄఍

2. Apache
Cassandra
• Google
BigTable䜢DHTୖ䛻ᐇ⿦䛧䛯ศᩓ䝕䞊
䝍䝇䝖䜰
• ከḟඖKVS䛾䜘䛖䛻ぢ䛘䜛
– KeySpace
(䝕䞊䝍䝧䞊䝇䛻┦ᙜ)
– ColumnFamily
(䝔䞊䝤䝹䛻┦ᙜ)
– Row
(⾜䛻┦ᙜ;
ศᩓඛ䝜䞊䝗䜢Ỵᐃ)
– Column
– (Timestamp)

3. ≉ᛶ
• Row
Key䛻䜘䛳䛶ศᩓ
– ୍䛴䛾Row䛻䛯䛟䛥䜣ワ䜑䜛䛸ศᩓ䛷䛝䛺䛔
– Kmestamp䛷᭱᪂䝕䞊䝍䜢⥔ᣢ
• ෕㛗ᛶ䛾ᗘྜ䛔䜢㑅ᢥྍ⬟
– ONE:
1ྎ䛻᭩䛡䛯䜙/ㄞ䜑䛯䜙OK
– QUORUM:
䝺䝥䝸䜹ᩘ䛾㐣༙ᩘ䛷OK
– ALL:
䝺䝥䝸䜹ᩘ䛾඲䛶䛷䜘䛖䜔䛟OK

4. ෕㛗ᛶ䞉つᶍᛶ
• ᣦᐃ䛧䛯䝺䝥䝸䜹ᩘศ䛰䛡䛾䝜䞊䝗䛻」〇
• ୍᫬ⓗ䛺ᨾ㞀䛿⫪௦䜟䜚䠄⤖ᯝᩚྜᛶ䠅
• Row䛜ቑ䛘䜛ศ䛻䛿↓㝈䛻䝇䜿䞊䝹ྍ⬟
䈜
ᚋ㏙
• 䝕䞊䝍䝉䞁䝍䞊䜔䝷䝑䜽䛻ᇶ䛵䛔䛶ศᩓྍ⬟

5. 䝸䞁䜾
• 䠄㠃ಽ䛺䛾䛷䝩䝽䜲䝖䝪䞊䝗䛷ㄝ᫂䠅

6. 㐠⏝
• ቯ䜜䛯䜙ᢤ䛡䜀Ⰻ䛔
– QUORUM䛷䝺䝥䝸䜹ᩘ3䛺䜙䜀䚸1ྎቯ䜜䛯᫬Ⅼ䛷
෌ྠᮇ䠄repair䠅䛩䜜䜀䝃䞊䝡䝇䛿↓೵Ṇ
• 㐃⥆䛧䛶2ྎቯ䜜䜛䛸䜎䛪䛔
– QUORUM䛷䝺䝥䝸䜹3ྎ䛾2ྎ䛜Ṛ䛼䛸ከᩘỴ䛜
ྲྀ䜜䛺䛔䚹

7. ᐃᮇrepair
• 䝕䞊䝍๐㝖
– 䝣䝷䜾❧䛶䜛䛰䛡
– 䝣䝷䜾䛜᫬㛫䛷ᾘ䛘䜛䠄10᪥䠅
– ẖ㐌䝨䞊䝇䛷䝕䞊䝍ྠᮇ䛜ᚲせ

8. Virtual
Nodes
• 1ྎ䛷N(256)ྎศ䛾௬᝿䝜䞊䝗
– ≉ᐃ䛾䝜䞊䝗䜈䛾೫䜚䜢㜵䛠
– N䜢ቑῶ䛥䛫䜛䛣䛸䛷ฎ⌮䛾㔜䜏௜䛡䛜ྍ⬟
• 䛂㐃⥆䛧䛯2ྎ䛾䝜䞊䝗䛾ᨾ㞀䠙Ṛ䛃
– ௵ព䛾2ྎ䛜㐃⥆䝜䞊䝗䛷䛒䜛ྍ⬟ᛶ䛜㧗䛔
– ᨾ㞀⋡䛭䛾䜒䛾䛿ୖ᪼

9. snapshot
• 䝕䜱䝇䜽ୖ䛾sstables䜢」〇䛧䛯䛰䛡
– ฼⏝㔞ศ䛭䛾䜎䜎㣗䛖
– 䝕䜱䝇䜽฼⏝⋡䛻ὀព
• snapshot඲㒊ᣢ䛳䛶⾜䛳䛶㣗䜟䛫䛶repair

10. ᨭ᥼䝒䞊䝹
• Jenkins䛷ᨭ᥼䝒䞊䝹䜢䝍䝇䜽໬
– ᐃᮇrepair
– ᐃᮇsnapshot
– 䝜䞊䝗㞀ᐖ᫬䛾removenode

11. ┘ど
• OpsCenter
– DataStax♫䛾⟶⌮䝒䞊䝹
• JMX
– Zabbix䜔Munin䛸䛛䛷┤᥋┘どྍ⬟
– Jolokia䛷JSON䛷ฟ䛧䛶ྛ✀䝒䞊䝹
• ᥋⥆┘ど
– Protocol䛾✀㢮䛜䛒䜛䠄䝫䞊䝖䜒㐪䛖䟿䠅
– Thri^ᤞ䛶䛶௒ᚋ䛿NaKve
transport
– h_ps://github.com/nekoruri/cql-­‐check

12. 䜎䛸䜑
• 䛣䜟䛟䛺䛔䜘䠄䛯䜆䜣䠅