Alex Markham created COUCHDB-1505:
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Summary: Error on cancelling replication - possbily related to
hanging replications
Key: COUCHDB-1505
URL: https://issues.apache.org/jira/browse/COUCHDB-1505
Project: CouchDB
Issue Type: Bug
Components: Replication
Affects Versions: 1.2
Environment: CentOS 5.6 x64. WAN replication (between datacentres).
Cronjob controlled replication curls every 5 mins. Using pull replication with
a filter.
Reporter: Alex Markham
Attachments: couchjs.txt, replicationcancelerror1.log
We run a cronjob to cancel replication, and then start it again every 5
minutes. Occasionally when cancelling replication jobs, a stack trace appears
in the couchdb log (attached)
Other observations : perhaps unrelated, but over time we slowly start to gather
"zombie" couchjs processes. After a month or so (different for each server) we
start to get up to near our os_process_limit of 200 and we restart couchdb.
"zombie" is speculation here, but there seems to be no need for the hundred+
couchjs processes when just replicating 10 databases and occasional indexing,
after restart it drops right back down. The started time of those processes are
also weeks old. This may be normal, not sure.
Why do we cancel replication and restart it? We found that if we don't do this
then WAN replications can hang, where curling /_replicate would say that the
continuous replication is already running, but that the replications were not
updating, and the document counts in the databases would diverge. Immediately
after re-enabling the "cancel":true /_replicate beforehand, these stack traces
re-appeared and the replication caught up.
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