elassandra | Elassandra = Elasticsearch + Apache Cassandra
kandi X-RAY | elassandra Summary
kandi X-RAY | elassandra Summary
Elassandra is an Apache Cassandra distribution including an Elasticsearch search engine. Elassandra is a multi-master multi-cloud database and search engine with support for replicating across multiple datacenters in active/active mode. Elasticsearch code is embedded in Cassanda nodes providing advanced search features on Cassandra tables and Cassandra serves as an Elasticsearch data and configuration store. Elassandra supports Cassandra vnodes and scales horizontally by adding more nodes without the need to reshard indices. Project documentation is available at doc.elassandra.io.
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Top functions reviewed by kandi - BETA
- Compares two objects for equality .
- Restores the specified snapshot .
- Gets the legal cast .
- Matches an R statement .
- Loads a whitelist from a resource file .
- Build index table .
- Factory method to create a DateTimeFormatter for a given string .
- Flattens aggregation .
- Parses the given search source into the given context .
- Internal implementation .
elassandra Key Features
elassandra Examples and Code Snippets
Lines of Code : 32License : Strong Copyleft (CC BY-SA 4.0)
Copypublic static int printExpression(int[] arr, int sum) {
return printExpression(arr, 0, "", sum);
}
public static int printExpression(int[] arr, int current, String expression, int sum) {
if (sum == 0) { // base case - target sum h
class Child extends Component {
render() {
console.log(this.props.myFunc);
return <>;
}
}
class Parent extends Component {
list = [
{ btn: {...someProps}},
{ btn: {...someProps} },
{ btn: {...someProps} },const handleClick = event => {
const value = Number(event.target.value); // converts string value to number
if (isNaN(value)) return; // stops if value is not a number
const newId = value + 1; // gets new ID based off the currentpublic static void main(String[] args) {
Map> source =
Map.of(1.0, List.of("AP"), 2.2, List.of("AB"), 2.5, List.of("AC"),
3.5, List.of("AD"), 4.5, List.of("AE", "AF"), 6.30000000000001, List.of("AG"));
NParseUser user = await ParseUser.currentUser();// this gets the current user object
var nuser = (user.username, oldpwdController!.text, user.username);
var resp = await nuser.login();
if (resp.success) {
user.password = pwdController
//Test class
public class Test {
public static void main(String[] args) {
Node root = new Node(1, "test1", new Node[]{
new Node(2, "test2", new Node[]{
new Node(5, "test6", new Node[]{})SELECT p.group_id, p.parent, c.child
FROM (
SELECT group_id, parent
FROM YourTable
GROUP BY group_id, parent
)
p CROSS JOIN
(
SELECT group_id, child
FROM WITH data as (
select * from values
(1, 2, '2022-03-01'::date),
(1, 4, '2022-03-04'::date),
(1, 200,'2022-04-01'::date),
(3, 20, '2022-03-01'::date)
t(item, amt, first_sale_dt)
)
select a.FROM busybox
WORKDIR /shared
RUN echo "shared content" > /shared/data.txt
name: example
services:
shared:
build: ./
volumes: [ shared:/shared ]
app-a:
image: busybox
command: cat /shared/da// where the unique times will be held
let unique_times = [];
// where the unique results will be held
let uniques = [];
// loop through the array backwards
for (var i = candles['AUDIOUSDT'].length; i--;) {
// if current time in object iCommunity Discussions
Trending Discussions on elassandra
QUESTION
I am trying to using elassandra (which is elasticsearch + cassandra) in Docker image, so I am beginner with it. In such case, my question can be beginner level, sorry for that :)
I have started that docker image and I'm able to inserting data and searching it but I don't know how to create a new cluster. According to this documentation I need to find elasticsearch.yml file in my image but I couldn't find it via docker cli terminal: https://elassandra.readthedocs.io/en/latest/configuration.html
So far I tried to use "find . elasticsearch.yml" command but there is no file like that in entire directories of image.
Thanks for your attention. Have a nice day!
...ANSWER
Answered 2022-Feb-04 at 06:52Looks like Aaron is correct. According to the code, it is injected into the same location as cassandra.yaml which is /etc/cassandra.
Source: docker-entrypoint.sh
QUESTION
I recently started working with an Elassandra cluster with two data centers which have been configured using NetworkTopologyStrategy.
Cluster details : Elassandra 6.2.3.15 = Elasticsearch 6.2.3 + Cassandra 3.11.4
ANSWER
Answered 2021-Aug-30 at 05:28These replication settings mean that the data for your keyspace is replicated in real time between the 2 DCs with each DC having 3 replicas (copies):
QUESTION
I am using Elassandra. In Cassandra, I have a UDT:
...ANSWER
Answered 2021-Mar-10 at 07:31It was a mistake in my query. The correct query would be:
QUESTION
I have a single node Elassandra cluster running on a box. It crashed light night. The following was the last line systemctl status output:
Main process exited, code=killed, status=6/ABRT
Upon restart however, it got stuck in mutation stage with similar lines appearing in the logs(/var/log/cassandra/system.log) repeatedly:
...ANSWER
Answered 2020-Sep-14 at 12:12To me the symptoms you described indicate that mutations are getting replayed from the commitlog.
You can workaround it by:
- Shutting C* down temporarily.
- Move the contents of the
commitlog/to another directory. - Start Cassandra.
QUESTION
Actually I'm adding new Elassandra node but the issue obviously involved to the Cassandra configurations.
Previously, I have two nodes in the cluster. There're perfectly connect with each other. Using nodetool status also returns both nodes information.
Then I added the new node to the cluster by followed this article https://docs.datastax.com/en/archived/cassandra/2.0/cassandra/operations/ops_add_node_to_cluster_t.html
the parameters I've set in the new node,
...ANSWER
Answered 2020-Aug-05 at 05:17I've seen this quite a bit and it's usually environmental rather than a Cassandra issue.
Check that there's bi-directional traffic between nodes on the listen_address IPs and that they can contact each other on gossip port 7000.
You mostly want to eliminate software/hardware firewalls blocking the traffic. Otherwise, ensure that network connectivity exists.
I've discussed this in detail in this post if it helps you -- https://community.datastax.com/questions/7413/. Cheers!
QUESTION
I have migrated my existing data in 4 nodes Cassandra (with RF=3) to Elassandra and after putting my mappings whole data got indexed into Elassandra. After the completion of indexing, all nodes show a consistent result in /_cat/indices?v API. But as soon as I restart any node the data on that node is reduced substantially, index size as well as the number of records. If I restart another node of the cluster the problem shift to that node and previous node recovers automatically. For more details and detailed use case please refer to the issue I have created with Elassandra.
ANSWER
Answered 2020-Mar-05 at 05:22Upgrade to Elassandra v6.8.4.3 has resolved the problem. Thanks!
Community Discussions, Code Snippets contain sources that include Stack Exchange Network
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No vulnerabilities reported
Install elassandra
Quick Start guide to run a single node Elassandra cluster in docker.
Deploy Elassandra by launching a Google Kubernetes Engine:
<<<<<<< HEAD Since version 6.8.4.2, the gossip X1 application state can be compressed using a system property. Enabling this settings allows the creation of a lot of virtual indices. Before enabling this setting, upgrade all the 6.8.4.x nodes to the 6.8.4.2 (or higher). Once all the nodes are in 6.8.4.2, they are able to decompress the application state even if the settings isn't yet configured locally. Elassandra use the Cassandra GOSSIP protocol to manage the Elasticsearch routing table and Elassandra 6.8.4.2+ add support for compression of the X1 application state to increase the maxmimum number of Elasticsearch indices. For backward compatibility, the compression is disabled by default, but once all your nodes are upgraded into version 6.8.4.2+, you should enable the X1 compression by adding -Des.compress_x1=true in your conf/jvm.options and rolling restart all nodes. Nodes running version 6.8.4.2+ are able to read compressed and not compressed X1. Before version 6.2.3.21, the Cassandra replication factor for the elasic_admin keyspace (and elastic_admin_[datacenter.group]) was automatically adjusted to the number of nodes of the datacenter. Since version 6.2.3.21 and because it has a performance impact on large clusters, it's now up to your Elassandra administrator to properly adjust the replication factor for this keyspace. Keep in mind that Elasticsearch mapping updates rely on a PAXOS transaction that requires QUORUM nodes to succeed, so replication factor should be at least 3 on each datacenter. Elassandra 6.2.3.19 metadata version now relies on the Cassandra table elastic_admin.metadata_log (that was elastic_admin.metadata from 6.2.3.8 to 6.2.3.18) to keep the elasticsearch mapping update history and automatically recover from a possible PAXOS write timeout issue. When upgrading the first node of a cluster, Elassandra automatically copy the current metadata.version into the new elastic_admin.metadata_log table. To avoid Elasticsearch mapping inconsistency, you must avoid mapping update while the rolling upgrade is in progress. Once all nodes are upgraded, the elastic_admin.metadata is not more used and can be removed. Then, you can get the mapping update history from the new elastic_admin.metadata_log and know which node has updated the mapping, when and for which reason. Elassandra 6.2.3.8+ now fully manages the elasticsearch mapping in the CQL schema through the use of CQL schema extensions (see system_schema.tables, column extensions). These table extensions and the CQL schema updates resulting of elasticsearch index creation/modification are updated in batched atomic schema updates to ensure consistency when concurrent updates occurs. Moreover, these extensions are stored in binary and support partial updates to be more efficient. As the result, the elasticsearch mapping is not more stored in the elastic_admin.metadata table.
Use the cqlsh embedded with Elassandra
Install a recent version of the cqlsh utility (pip install cqlsh) or run it from a docker image:
Elasticsearch now supports only one document type per index backed by one Cassandra table. Unless you specify an elasticsearch type name in your mapping, data is stored in a cassandra table named "_doc". If you want to search many cassandra tables, you now need to create and search many indices.
Elasticsearch 6.x manages shard consistency through several metadata fields (_primary_term, _seq_no, _version) that are not used in elassandra because replication is fully managed by cassandra.
Ensure Java 8 is installed and JAVA_HOME points to the correct location.
Download and extract the distribution tarball
Define the CASSANDRA_HOME environment variable : export CASSANDRA_HOME=<extracted_directory>
Run bin/cassandra -e
Run bin/nodetool status
Run curl -XGET localhost:9200/_cluster/state
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