[MCOL-5163] Increase the stability of writing processes: WriteEngineServer, DMLProc, DDLProc - Jira

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Details

Type: New Feature
Status: Closed (View Workflow)
Priority: Major
Resolution: Fixed
Affects Version/s: 6.4.1
Fix Version/s: 22.08.1
Component/s: DDLProc, DMLProc, writeengine
Labels:
None

Sprint:
2021-17

Description

As of 6.4.1 MCS uses systemd to handle processing start and stop routine. It also handles the processes hierarchy restarts, e.g. if mcs-primproc(contains both EM and PP) crashes systemd restarts mcs-writeengineserver unit. If WE is in the middle of a write operation this potentially left the system in an unusable state. If mcs-writeengineserver is restarted systemd restarts both mcs-dmlproc and mcs-ddlproc so if DMLProc was doing some changes it left failed transactions behind. It is tedious to clean these stuck txns from the cluster.
The suggested approach is to decouple pairs: mcs-primproc, mcs-writeengineserver and mcs-writeengineserver and mcs-dmlproc, mcs-writeengineserver and mcs-ddlproc systemd-wise.

Attachments

Issue Links

is duplicated by

MCOL-4785 ROLLBACK of a long lasting DML left cluster in unusable state

Closed

MCOL-4798 ExeMgr hit cpu , cluster in read only and reported PrimProc error reading file ,Error reading compression header.

Closed

Activity

People

Assignee:: Daniel Lee (Inactive)

Reporter:: Roman

Votes:: 0 Vote for this issue

Watchers:: 2 Start watching this issue

Dates

Created:: 2022-07-19 16:22

Updated:: 2022-10-25 22:46

Resolved:: 2022-08-19 15:40

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