The first time the root account was misused for startup, the elasticsearch.keystore permission under the path belongs to root -rw-rw- 1 root root 199 Mar 24 17: 36 elasticsearch.keystore Refer to the log for complete error details (Files.java: 425 )Īt .SimpleFSDirectory.openInput(SimpleFSDirectory.java: 77 )Īt .KeyStoreWrapper.load(KeyStoreWrapper.java: 219 )Īt .loadSecureSettings(Bootstrap.java: 234 )Īt .init(Bootstrap.java: 305 )Īt .init(Elasticsearch.java: 159 )Īt .execute(Elasticsearch.java: 150 )Īt .execute(EnvironmentAwareCommand.java: 86 )Īt .mainWithoutErrorHandling(Command.java: 125 )Īt .main(Command.java: 90 )Īt .main(Elasticsearch.java: 115 )Īt .main(Elasticsearch.java: 92 ) 2/config/ elasticsearch.keystoreĪt java.base/.Uni圎anslateToIOException(Uni圎xception.java: 90 )Īt java.base/.Uni圎xception.rethrowAsIOException(Uni圎xception.java: 111 )Īt java.base/.Uni圎xception.rethrowAsIOException(Uni圎xception.java: 116 )Īt java.base/.UnixFileSystemProvider.newByteChannel(UnixFileSystemProvider.java: 219 )Īt java.base/java.nio. AccessDeniedException: /data/elasticsearch/elasticsearch- 7.4.

file.AccessDeniedException: /data/elasticsearch/elasticsearch- 7.4.

Adding insert, deleting delete, changing update, and searching operations in relational databases are equivalent to adding PUT/POST, deleting Delete, changing_update, and searching GET in ES.Įrror Alert bin]$ Exception in thread ' main ' : java.nio.

In relational databases, schema defines tables, the fields of each table, and the relationships between tables and fields.Correspondingly, in ES: Mapping defines the field processing rules for Type under the index, that is, how the index is built, the type of index, whether the original index JSON document is saved, whether the original JSON document is compressed, whether word breaking is required, how word breaking is done, etc.

Data in a database Table consists of multiple rows (ROW) and multiple columns (columns, attributes), equivalent to a Type consisting of multiple documents (Document s) and multiple Field s.

A relational database has N tables, equivalent to N multiple types under an Index index Index.

A database in a relational database (DataBase) is equivalent to an Index in ES.

Support plug-in mechanism, word breaking plug-in, synchronization plug-in, Hadoop plug-in, visualization plug-in, etc.It can be extended to hundreds of servers to handle structured or unstructured data at the PB level.It can also run on a single PC.Distributed search engine for real-time analysis.Distributed: The index is split into multiple tiles, each with zero or more copies load rebalancing and routing are done automatically in most cases.Distributed real-time file storage allows each field to be indexed so that it can be retrieved.

Part Two: elasticsearch 2.1 ES Features and Advantages The practice of this case is mainly to collect, manage and retrieve slow query logs and error logs of mysql instances through ELK. We also use the filebeat plug-in to build the platform.Filebeat is a log data collector for local files that monitors the log directory or tail file and forwards data to Elasticsearch, Logstatsh, and so on. kibana: Visual data display and operation management.elasticsearch, data storage, and full-text retrieval.ELK is a log analysis platform that integrates distributed data storage, visual query and log resolution.ELK=elasticsearch+Logstash+kibana, each of which has its own duties, cooperates with each other to complete the data processing of the log.The main functions of each ELK component are as follows:

Filebeats set document id