Couchbase Server

memcached process is not killed when uninstall is run when memcached persistent queue is still processing data

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  • Flagged:
    Release Note

Description

When uninstall membase server version membase-server-enterprise_x86_64_v0.0.0-176-g1a77283.deb, the uninstall proccess does not kill memcached.

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Steve Yen added a comment -
Killing memcached harshly would lose customer data (items in the persistence queue that are still waiting to drain to disk).

Although an uninstall is a strong user command, the "do no harm (do no data loss)" philosophy seems to be the safe choice.
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Steve Yen added a comment - Killing memcached harshly would lose customer data (items in the persistence queue that are still waiting to drain to disk). Although an uninstall is a strong user command, the "do no harm (do no data loss)" philosophy seems to be the safe choice.
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Farshid Ghods added a comment -
this behavior is expected so that we dont lose any data during uninstallation.
the workaround is that the user
1- do not uninstall membase if its still processing data in the persisten queue
2- run killall -9 memcached after uninstall but before reinstallation
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Farshid Ghods added a comment - this behavior is expected so that we dont lose any data during uninstallation. the workaround is that the user 1- do not uninstall membase if its still processing data in the persisten queue 2- run killall -9 memcached after uninstall but before reinstallation
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Steve Yen added a comment -
Hearing more instances of this still since yesterday.

Farshid is adding 'ps' output to the test suite so we can get more proof.
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Steve Yen added a comment - Hearing more instances of this still since yesterday. Farshid is adding 'ps' output to the test suite so we can get more proof.
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Steve Yen added a comment -
The remaining process is an epmd process, which is not the memcached process, but is instead the erlang port mapper daemon (epmd).

There's already some older bug which covers the issue that epmd is still running after an uninstall on linux, so marking this one as a duplicate.
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Steve Yen added a comment - The remaining process is an epmd process, which is not the memcached process, but is instead the erlang port mapper daemon (epmd). There's already some older bug which covers the issue that epmd is still running after an uninstall on linux, so marking this one as a duplicate.
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Thuan Nguyen added a comment -
I still see membase serice after uninstall membase server version basestar-182 in ubuntu 1004 32bit
http://screencast.com/t/qeOuiivIQ
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Thuan Nguyen added a comment - I still see membase serice after uninstall membase server version basestar-182 in ubuntu 1004 32bit http://screencast.com/t/qeOuiivIQ
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Thuan Nguyen added a comment -
Test on build 177. I don't see memcached process after uninstall membase server
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Thuan Nguyen added a comment - Test on build 177. I don't see memcached process after uninstall membase server

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  • Assignee:
    Steve Yen
    Reporter:
    Thuan Nguyen
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