wal2json | JSON output plugin for changeset extraction | JSON Processing library
kandi X-RAY | wal2json Summary
kandi X-RAY | wal2json Summary
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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QUESTION
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 14:12Without 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.
QUESTION
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 03:20I 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:
QUESTION
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 05:19You can specify a custom pg_hba.conf location by editing/including the hba_file parameter in postgresql.conf. From the documentation:
QUESTION
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 02:21I 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.
QUESTION
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 01:23Thanks people, the proble was i missing the option "plugin.name" and set it for pgoutput Thanks
QUESTION
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 10:25Reason for this is that you did not specify user name in database connection string parameters. Linux pg_recvlogical man page says:
QUESTION
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 21:20You've specified a host/port for Postgres that is not reachable from where Kafka Connect is running
QUESTION
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 13:34wal_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.
QUESTION
The Kafka debezium-postgres connector in my application is throwing this error:
...ANSWER
Answered 2020-Jan-08 at 19:28I 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.
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