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PXC-4572 [DOCS] - PXC needs a local socket to work properly #182

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PXC-4572 [DOCS] - PXC needs a local socket to work properly #182

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12 changes: 11 additions & 1 deletion docs/limitation.md
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Expand Up @@ -73,6 +73,16 @@ The following limitations apply to Percona XtraDB Cluster:
!!! admonition "See also"

[Galera Documentation: Tables without Primary Keys](https://galeracluster.com/library/training/tutorials/differences.html#tables-without-primary-keys)

* When configuring Percona XtraDB Cluster, your server must create a local socket.

You can set up a socket by providing a path, or you can skip creating one explicitly. However, do not leave the <socket> variable in my.cnf empty, like this: `socket=`. If you do, the server won’t create a socket.

State Snapshot Transfer (SST) requires the socket for the following tasks:

* Taking backup using Percona XtraBackup

* Detecting keyring component status

* Avoid reusing the names of persistent tables for temporary tables

Expand Down Expand Up @@ -110,4 +120,4 @@ Do not use one or more dot characters (.) when defining the values for the follo

* [log_bin_index](https://dev.mysql.com/doc/refman/8.0/en/replication-options-binary-log.html#option_mysqld_log-bin-index)

MySQL and **XtraBackup** handles the value in different ways and this difference causes unpredictable behavior.
MySQL and Percona XtraBackup handle the character in different ways and this difference causes unpredictable behavior.
8 changes: 8 additions & 0 deletions docs/state-snapshot-transfer.md
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Expand Up @@ -15,6 +15,14 @@ The SST method can be configured using the [`wsrep_sst_method`](wsrep-system-ind
!!! note

If the [`gcs.sync_donor`](wsrep-provider-index.md#gcs.sync_donor) variable is set to `Yes` (default is `No`), the whole cluster will get blocked if the donor is blocked by SST.

## Limitation

When configuring Percona XtraDB Cluster, your server must create a local socket. You can set up a socket by providing a path, or you can skip creating one explicitly. However, do not leave the <socket> variable in my.cnf empty, like this: `socket=`. If you do, the server won’t create a socket. State Snapshot Transfer (SST) requires the local socket for the following tasks:

* Taking backup using Percona XtraBackup

* Detecting keyring component status

## Choose the SST Donor

Expand Down