ttl

问题 In Java Spark, I have a dataframe that has a 'bucket_timestamp' column, which represents the time of the bucket that the row belongs to. I want to write the dataframe to a Cassandra DB. The data must be written to the DB with TTL. The TTL should be depended on the bucket timestamp - where each row's TTL should be calculated as ROW_TTL = CONST_TTL - (CurrentTime - bucket_timestamp) , where CONST_TTL is a constant TTL that I configured. Currently I am writing to Cassandra with spark using a

问题 In Java Spark, I have a dataframe that has a 'bucket_timestamp' column, which represents the time of the bucket that the row belongs to. I want to write the dataframe to a Cassandra DB. The data must be written to the DB with TTL. The TTL should be depended on the bucket timestamp - where each row's TTL should be calculated as ROW_TTL = CONST_TTL - (CurrentTime - bucket_timestamp) , where CONST_TTL is a constant TTL that I configured. Currently I am writing to Cassandra with spark using a

问题 Scripting and want to ping devices on a network, tell me if it's reachable or not, and then get the ttl data from the ping and tell me the operating system. Ive tried using the awk command, but I am also new to scripting and may not be using it correctly. for host in $(seq 1 255); do ping -c 1 $sn.$host | grep "Unreachable" &>/dev/null if [ $? -eq 0 ]; then printf "%s\n" "$sn.$host is Offline" fi ping -c 1 $sn.$host | grep "ttl" &>/dev/null if [ $? -eq 0 ]; then printf "%s\n" "$sn.$host is

问题 Scripting and want to ping devices on a network, tell me if it's reachable or not, and then get the ttl data from the ping and tell me the operating system. Ive tried using the awk command, but I am also new to scripting and may not be using it correctly. for host in $(seq 1 255); do ping -c 1 $sn.$host | grep "Unreachable" &>/dev/null if [ $? -eq 0 ]; then printf "%s\n" "$sn.$host is Offline" fi ping -c 1 $sn.$host | grep "ttl" &>/dev/null if [ $? -eq 0 ]; then printf "%s\n" "$sn.$host is

问题 Scripting and want to ping devices on a network, tell me if it's reachable or not, and then get the ttl data from the ping and tell me the operating system. Ive tried using the awk command, but I am also new to scripting and may not be using it correctly. for host in $(seq 1 255); do ping -c 1 $sn.$host | grep "Unreachable" &>/dev/null if [ $? -eq 0 ]; then printf "%s\n" "$sn.$host is Offline" fi ping -c 1 $sn.$host | grep "ttl" &>/dev/null if [ $? -eq 0 ]; then printf "%s\n" "$sn.$host is

问题 I want to listen the expire events from Redis. I've configured on my redis.conf the notify-keyspace-events "AKE" and this is my code on node: const redis = require('redis'); const client = redis.createClient(); const subscriber = redis.createClient(); const KEY_EXPIRING_TIME = 10; // seconds client.setex('myKey', KEY_EXPIRING_TIME, 'myValue'); subscriber.on('message', function(channel, msg) { console.log( `On ${channel} received ${msg} event`); }); subscriber.subscribe('myKey', function (err)

问题 I want to listen the expire events from Redis. I've configured on my redis.conf the notify-keyspace-events "AKE" and this is my code on node: const redis = require('redis'); const client = redis.createClient(); const subscriber = redis.createClient(); const KEY_EXPIRING_TIME = 10; // seconds client.setex('myKey', KEY_EXPIRING_TIME, 'myValue'); subscriber.on('message', function(channel, msg) { console.log( `On ${channel} received ${msg} event`); }); subscriber.subscribe('myKey', function (err)

问题 I want to listen the expire events from Redis. I've configured on my redis.conf the notify-keyspace-events "AKE" and this is my code on node: const redis = require('redis'); const client = redis.createClient(); const subscriber = redis.createClient(); const KEY_EXPIRING_TIME = 10; // seconds client.setex('myKey', KEY_EXPIRING_TIME, 'myValue'); subscriber.on('message', function(channel, msg) { console.log( `On ${channel} received ${msg} event`); }); subscriber.subscribe('myKey', function (err)

问题 I want to listen the expire events from Redis. I've configured on my redis.conf the notify-keyspace-events "AKE" and this is my code on node: const redis = require('redis'); const client = redis.createClient(); const subscriber = redis.createClient(); const KEY_EXPIRING_TIME = 10; // seconds client.setex('myKey', KEY_EXPIRING_TIME, 'myValue'); subscriber.on('message', function(channel, msg) { console.log( `On ${channel} received ${msg} event`); }); subscriber.subscribe('myKey', function (err)

问题 I want to listen the expire events from Redis. I've configured on my redis.conf the notify-keyspace-events "AKE" and this is my code on node: const redis = require('redis'); const client = redis.createClient(); const subscriber = redis.createClient(); const KEY_EXPIRING_TIME = 10; // seconds client.setex('myKey', KEY_EXPIRING_TIME, 'myValue'); subscriber.on('message', function(channel, msg) { console.log( `On ${channel} received ${msg} event`); }); subscriber.subscribe('myKey', function (err)