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MDEV-26971: JSON file interface to wsrep node state.

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Integration with status reporter in wsrep-lib.

Status reporter reports changes in wsrep state and logged errors/
warnings to a json file which then can be read and interpreted by
an external monitoring tool.

Rationale: until the server is fully initialized it is unaccessible
by client and the only source of information is an error log which
is not machine-friendly. Since wsrep node can spend a very long time
in initialization phase (state transfer), it may be a very long time
that automatic tools can't easily monitor its liveness and progression.

New variable: wsrep_status_file specifies the output file name.
If not set, no file is created and no reporting is done.

Reviewed-by: Jan Lindström <jan.lindstrom@mariadb.com>
This commit is contained in:
Alexey Yurchenko
2021-09-05 17:07:05 +03:00
committed by Sergei Golubchik
parent d526551587
commit 9d7e596ba6
16 changed files with 193 additions and 3 deletions
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mysql-test/suite/wsrep/r/variables_debug.result
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@ -136,6 +136,7 @@ WSREP_SST_DONOR_REJECTS_QUERIES
WSREP_SST_METHOD
WSREP_SST_RECEIVE_ADDRESS
WSREP_START_POSITION
WSREP_STATUS_FILE
WSREP_SYNC_WAIT
WSREP_TRX_FRAGMENT_SIZE
WSREP_TRX_FRAGMENT_UNIT