[MXS-1983] Failed to add dcb to epoll set Created: 2018-07-19  Updated: 2019-07-12  Resolved: 2018-08-06

Status: Closed
Project: MariaDB MaxScale
Component/s: Core
Affects Version/s: 2.2.11
Fix Version/s: 2.2.13

Type: Bug Priority: Major
Reporter: dapeng huang Assignee: markus makela
Resolution: Fixed Votes: 0
Labels: None

Issue Links:
Relates
relates to MXS-2235 Failed to add dcb to epoll set Closed
Sprint: MXS-SPRINT-63

 Description    

2018-07-18 17:54:57   error  : (1) Failed to write message: 11, Resource temporarily unavailable
 
2018-07-18 17:54:57   error  : (1) Could not post task to add DCB to worker.
 
2018-07-18 17:54:57   error  : (1) [mariadbclient] Failed to add dcb 0x7f74606da970 for fd 1897 to epoll set.


 
 
  ssize_t n = write(m_write_fd, &message, sizeof(message)); // Maybe should retry on error EAGAIN



 Comments   
Comment by markus makela [ 2018-07-19 ]

This might be a side-effect of MXS-1948.

Comment by markus makela [ 2018-07-24 ]

A patch to this is on the MXS-1983 branch on GitHub.

Comment by markus makela [ 2018-07-31 ]

Possibly fixed with:

[markusjm@localhost core]$ sudo sysctl -w fs.pipe-max-size=33554432
 
fs.pipe-max-size = 33554432

Comment by markus makela [ 2018-08-03 ]

Appears to be fixed by increasing pipe buffer size. For the sake of improving the chances of the problem not appearing, the "smart" retrying should be incorporated with minor changes.

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