- **status**: assigned --> review
---
** [tickets:#3123] mds: mds flow control keep all messages in queue**
**Status:** review
**Milestone:** 5.20.01
**Created:** Tue Nov 26, 2019 09:58 AM UTC by Thuan Tran
**Last Updated:** Tue Nov 26, 2019 09:58 AM UTC
**Owner:** Thuan Tran
mdstest 27 8 sometimes fail with below mds.log
~~~
<139>1 2019-11-25T19:21:14.330475+01:00 SC-1 cmdline 3323 mds.log [meta
sequenceId="37776"] FCTRL: sendto() failed, Error[Cannot allocate memory]
<141>1 2019-11-25T19:21:14.331058+01:00 SC-1 cmdline 3323 mds.log [meta
sequenceId="37777"] FCTRL: [me] --> [node:1001001, ref:1838287776],
QueData[mseq:35941, mfrag:0, fseq:35941, len:50043], sndwnd[acked:1850,
send:35942, nacked:1706015913]
<141>1 2019-11-25T19:21:14.333086+01:00 SC-1 cmdline 3323 mds.log [meta
sequenceId="37778"] FCTRL: [me] --> [node:1001001, ref:1838287776],
QueData[mseq:35942, mfrag:0, fseq:35942, len:50043], sndwnd[acked:1850,
send:35943, nacked:1706065956]
<141>1 2019-11-25T19:21:14.335142+01:00 SC-1 cmdline 3323 mds.log [meta
sequenceId="37779"] FCTRL: [me] --> [node:1001001, ref:1838287776],
QueData[mseq:35943, mfrag:0, fseq:35943, len:50043], sndwnd[acked:1850,
send:35944, nacked:1706115999]
....
<141>1 2019-11-25T19:21:24.288801+01:00 SC-1 cmdline 3323 mds.log [meta
sequenceId="44679"] FCTRL: [me] --> [node:1001001, ref:1838287776],
QueData[mseq:42843, mfrag:0, fseq:42843, len:50043], sndwnd[acked:1850,
send:42844, nacked:2051412699]
<141>1 2019-11-25T19:21:24.290529+01:00 SC-1 cmdline 3323 mds.log [meta
sequenceId="44680"] FCTRL: [me] --> [node:1001001, ref:1838287776],
QueData[mseq:42844, mfrag:0, fseq:42844, len:50043], sndwnd[acked:1850,
send:42845, nacked:2051462742]
<141>1 2019-11-25T19:21:24.293071+01:00 SC-1 cmdline 3323 mds.log [meta
sequenceId="44681"] FCTRL: [me] --> [node:1001001, ref:1838287776],
QueData[mseq:42845, mfrag:0, fseq:42845, len:50043], sndwnd[acked:1850,
send:42846, nacked:2051512785]
~~~
When overflow happens, mds with flow control enabled may keep
all messages in queue if it fails to send a message when receiving
Nack or ChunkAck since no more trigger come after that.
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