なぜ私はNoHostAvailableを得ましたか：

Question

私はこの単純なクエリ実行する場合：

SELECT * from myapp.latests WHERE organization_id = 1 and user_id = 1; 

を私はエラーを取得：

NoHostAvailable: 

がにnodetool status結果を実行：

Datacenter: eu-central 
====================== 
Status=Up/Down 
|/ State=Normal/Leaving/Joining/Moving 
-- Address Load  Tokens  Owns (effective) Host ID        Rack 
UN 10.0.0.53 190.96 KiB 256   0.0%    80f8bf0a-c46d-41ce-bb2e-498def5b3792 1a 
UN 10.0.20.5 189.35 KiB 256   0.0%    f25fe4bf-29b2-4403-8e3e-4e973a5f26ab 1b 
UN 10.0.0.54 183.13 KiB 256   0.0%    c46ac05a-6cb2-48f1-a776-2c57c33e7719 1a 

そして、ここでの説明です：

DESCRIBE myapp; 

CREATE KEYSPACE myapp WITH replication = {'class': 'NetworkTopologyStrategy', 'eu-central-1': '2'} AND durable_writes = true; 

CREATE TABLE myapp.locations (
    organization_id int, 
    user_id int, 
    date text, 
    unix_time bigint, 
    lat double, 
    long double, 
    PRIMARY KEY ((organization_id, user_id, date), unix_time) 
) WITH CLUSTERING ORDER BY (unix_time ASC) 
    AND bloom_filter_fp_chance = 0.01 
    AND caching = {'keys': 'ALL', 'rows_per_partition': 'NONE'} 
    AND comment = '' 
    AND compaction = {'class': 'org.apache.cassandra.db.compaction.SizeTieredCompactionStrategy', 'max_threshold': '32', 'min_threshold': '4'} 
    AND compression = {'chunk_length_in_kb': '64', 'class': 'org.apache.cassandra.io.compress.LZ4Compressor'} 
    AND crc_check_chance = 1.0 
    AND dclocal_read_repair_chance = 0.1 
    AND default_time_to_live = 0 
    AND gc_grace_seconds = 864000 
    AND max_index_interval = 2048 
    AND memtable_flush_period_in_ms = 0 
    AND min_index_interval = 128 
    AND read_repair_chance = 0.0 
    AND speculative_retry = '99PERCENTILE'; 

CREATE TABLE myapp.latests (
    organization_id int, 
    user_id int, 
    lat double, 
    long double, 
    unix_time bigint, 
    PRIMARY KEY (organization_id, user_id) 
) WITH CLUSTERING ORDER BY (user_id ASC) 
    AND bloom_filter_fp_chance = 0.01 
    AND caching = {'keys': 'ALL', 'rows_per_partition': 'NONE'} 
    AND comment = '' 
    AND compaction = {'class': 'org.apache.cassandra.db.compaction.SizeTieredCompactionStrategy', 'max_threshold': '32', 'min_threshold': '4'} 
    AND compression = {'chunk_length_in_kb': '64', 'class': 'org.apache.cassandra.io.compress.LZ4Compressor'} 
    AND crc_check_chance = 1.0 
    AND dclocal_read_repair_chance = 0.1 
    AND default_time_to_live = 0 
    AND gc_grace_seconds = 864000 
    AND max_index_interval = 2048 
    AND memtable_flush_period_in_ms = 0 
    AND min_index_interval = 128 
    AND read_repair_chance = 0.0 
    AND speculative_retry = '99PERCENTILE'; 

いいですか？

Answer 1

あなたのクライアントはあなたがポートが（別のポートとプロトコル（JMX）を使用してnodetool）カサンドラ・ノード間の開いていることをクラスタチェックにcqlshからそれを実行している場合はポート9042. に接続する権限を持っていることを確認してください。