wal2json | JSON output plugin for changeset extraction | JSON Processing library

 by   eulerto C Version: wal2json_2_5 License: BSD-3-Clause

kandi X-RAY | wal2json Summary

kandi X-RAY | wal2json Summary

wal2json is a C library typically used in Utilities, JSON Processing applications. wal2json has no bugs, it has no vulnerabilities, it has a Permissive License and it has medium support. You can download it from GitHub.

wal2json is an output plugin for logical decoding. It means that the plugin have access to tuples produced by INSERT and UPDATE. Also, UPDATE/DELETE old row versions can be accessed depending on the configured replica identity. Changes can be consumed using the streaming protocol (logical replication slots) or by a special SQL API. format version 1 produces a JSON object per transaction. All of the new/old tuples are available in the JSON object. Also, there are options to include properties such as transaction timestamp, schema-qualified, data types, and transaction ids. format version 2 produces a JSON object per tuple. Optional JSON object for beginning and end of transaction. Also, there are a variety of options to include properties.
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            kandi-support Support

              wal2json has a medium active ecosystem.
              It has 1113 star(s) with 156 fork(s). There are 36 watchers for this library.
              OutlinedDot
              It had no major release in the last 12 months.
              There are 14 open issues and 175 have been closed. On average issues are closed in 50 days. There are 8 open pull requests and 0 closed requests.
              It has a neutral sentiment in the developer community.
              The latest version of wal2json is wal2json_2_5

            kandi-Quality Quality

              wal2json has 0 bugs and 0 code smells.

            kandi-Security Security

              wal2json has no vulnerabilities reported, and its dependent libraries have no vulnerabilities reported.
              wal2json code analysis shows 0 unresolved vulnerabilities.
              There are 0 security hotspots that need review.

            kandi-License License

              wal2json is licensed under the BSD-3-Clause License. This license is Permissive.
              Permissive licenses have the least restrictions, and you can use them in most projects.

            kandi-Reuse Reuse

              wal2json releases are available to install and integrate.
              Installation instructions, examples and code snippets are available.

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            wal2json Key Features

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            wal2json Examples and Code Snippets

            No Code Snippets are available at this moment for wal2json.

            Community Discussions

            QUESTION

            wal2json with the existing WAL (Postgres)
            Asked 2021-Dec-29 at 14:12

            I have some WAL files in my current system, Do we have any solutions to use these files with wal2json? (no base backup, no archive WAL)

            ...

            ANSWER

            Answered 2021-Dec-29 at 14:12

            Without a logical replication slot from at least that far back, it is not feasible. The catalogs must have retained enough information to reconstruct the table structures being replicated as-of the time of the WAL files it is decoding. Preserving that data is one of the things a logical replication slot does.

            Source https://stackoverflow.com/questions/70515524

            QUESTION

            Postgres Replication Slots Checking Lag
            Asked 2021-Apr-27 at 03:20

            I'm attempting to detect on my AWS RDS Aurora Postgres 11.9 instance if my three Logical Replication slots are backing up. I'm using wal2json plugin to read off of them continuously. Two of the slots are being read off by python processes. The third is kafka-connect consumer.

            I'm using the below query, but am getting odds results. It is saying two of my slots are several GB behind even in the middle of the night when we have very small load. Am I misinterpreting what the query is saying?

            ...

            ANSWER

            Answered 2021-Apr-27 at 03:20

            I wasn't properly performing send_feedback during my consume function. So I was consuming the records, but I wasn't telling the Postgres replication slot that I had consumed the records.

            Here is my complete consume function in case others interested:

            Source https://stackoverflow.com/questions/67227061

            QUESTION

            Editing the pg_hba.conf in the default postgres:12 docker image
            Asked 2021-Jan-17 at 06:37

            I'm trying to enable streaming replication in the standard postgres:12 docker image, this requires changes to pg_hba.conf. I've managed to update the postgresql.conf via forcibly making the database use it (passing the the -c config_file="<>" flag in docker-compose rather through init scripts).

            But I cannot find a parameter or flag option to get the database to use my pg_hba.conf despite trying to do so in startup scripts copied to docker-entrypoint-initdb.d.

            Any ideas?

            Docker-compose ...

            ANSWER

            Answered 2021-Jan-17 at 05:19

            You can specify a custom pg_hba.conf location by editing/including the hba_file parameter in postgresql.conf. From the documentation:

            Source https://stackoverflow.com/questions/65756459

            QUESTION

            How to deploy kafka sink connection with multiple topics and table destination
            Asked 2020-Apr-28 at 02:21

            From my previous question, I have decided to more consent about consumer deployment for database real-time synchronization with Kafka distributed. Same case; I have more than hundreds of tables that I want to pull from PostgreSQL to SQL Server. From PostgreSQL to Kafka I used Debezium connectors with wal2json plugins. And from Kafka to SQL Server I use JDBC Connectors. I have three identical setting brokers (different address):

            ...

            ANSWER

            Answered 2020-Apr-28 at 02:21

            I have check that i think due Kafka connect jdbc use batch.record to organized number of record that should sent to SQL server, it seems problem when i use upsert with large size of record. I assume i must to reduce batch to 1, both in source and sink. This still preliminary answer. And also, if someone know how to show the SQL query used to insert in Kafka connect JDBC, it will helpful to me to learn mechanism about JDBC behavior and how to tackle the deadlock.

            And the best practice as far from my experience, if the target db is exist but no table inside, is to prioritize which table must inserted first and wait till it done and not use insert. For the table less than 100000 rows can be grouped to be one group, but large dimension table must pulled separately.

            Source https://stackoverflow.com/questions/61220459

            QUESTION

            debezium could not access file "decoderbufs" using postgres 11 with default plugin pgoutput
            Asked 2020-Apr-22 at 17:51

            I'm new to kafka, I'm trying to use the debezium postgres connector. but even using postgres version 11 with the standard plugin I get this error: org.apache.kafka.connect.errors.ConnectException: org.postgresql.util.PSQLException: ERROR: could not access file "decoderbufs": No such file or directory

            To run kafka / debezium I'm using the image of the fast-data-dev docker as you can see below

            ...

            ANSWER

            Answered 2020-Feb-27 at 01:23

            Thanks people, the proble was i missing the option "plugin.name" and set it for pgoutput Thanks

            Source https://stackoverflow.com/questions/59978213

            QUESTION

            Why is postgres taking computer user as login user?
            Asked 2020-Mar-25 at 10:25

            I am trying to test wal2json on my system with Postgresql database. I have made changes in my postgresql.conf & pg_hba.conf file as shown in this link:

            https://github.com/eulerto/wal2json

            But when I am trying to create a test slot using postgres command, it is giving error:

            ...

            ANSWER

            Answered 2020-Mar-25 at 10:25

            Reason for this is that you did not specify user name in database connection string parameters. Linux pg_recvlogical man page says:

            Source https://stackoverflow.com/questions/60845444

            QUESTION

            Error 500 Could not create PG connection when registering kafka connect PG connectors with multiple brokers
            Asked 2020-Mar-21 at 21:20

            I try using multiple brokers kafka when single distributed mode doesn't satisfied me. But i get another problem when registering kafka source Postgresql connectors. It always sent me error 500 when registered it. Here's my kafka connect distributed config:

            ...

            ANSWER

            Answered 2020-Mar-21 at 21:20

            You've specified a host/port for Postgres that is not reachable from where Kafka Connect is running

            Source https://stackoverflow.com/questions/60775558

            QUESTION

            How to limit WAL size when using Postgres Logical Replication Slot?
            Asked 2020-Mar-05 at 06:42

            I am creating replication slot and streaming changes from AWS Postgres RDS to java process through JDBC driver.

            My replication slot creation code looks like this.

            ...

            ANSWER

            Answered 2020-Mar-04 at 13:34

            wal_keep_segments is irrelevant for logical decoding.

            With logical decoding, you always have to use a logical replication slot, which is a data structure which marks a position in the transaction log (WAL), so that the server never discards old WAL segments that logical decoding might still need.

            That is why your WAL directory grows if you don't consume the changes.

            wal_keep_segments specifies a minimum number of old WAL segments to retain. It is used for purposes like streaming replication, pg_receivewal or pg_rewind.

            Source https://stackoverflow.com/questions/60527214

            QUESTION

            kafka-connect Error: Unable to obtain valid replication slot
            Asked 2020-Jan-08 at 19:28

            The Kafka debezium-postgres connector in my application is throwing this error:

            ...

            ANSWER

            Answered 2020-Jan-08 at 19:28

            I got it fixed by rebooting the rds DB instance in aws which was referred by the connector , After that the value of confirmed_flush_lsn got reset to a non-null value somewhat similar to (restart_lsn = 3/93043310). The kafka-connect was able to find the replication_slot "slot1" as expected. The connectors were also up. This fixed my problem temporarily but still I would like to understand what set confirmed_flush_lsn =null for a logical replication_slot in the first place.

            Source https://stackoverflow.com/questions/59634983

            Community Discussions, Code Snippets contain sources that include Stack Exchange Network

            Vulnerabilities

            No vulnerabilities reported

            Install wal2json

            This extension is supported on [those platforms](http://www.postgresql.org/docs/current/static/supported-platforms.html) that PostgreSQL is. The installation steps depend on your operating system. [PostgreSQL yum repository](https://yum.postgresql.org) and [PostgreSQL apt repository](https://wiki.postgresql.org/wiki/Apt) provide wal2json packages. You can also keep up with the latest fixes and features cloning the Git repository.

            Support

            For any new features, suggestions and bugs create an issue on GitHub. If you have any questions check and ask questions on community page Stack Overflow .
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