Eric Bus created SOLR-5579:
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Summary: Leader stops processing collection-work-queue after
failed collection reload
Key: SOLR-5579
URL: https://issues.apache.org/jira/browse/SOLR-5579
Project: Solr
Issue Type: Bug
Affects Versions: 4.5.1
Environment: Debian Linux 6.0 running on VMWare
Using embedded SOLR Jetty.
Reporter: Eric Bus
I've been experiencing the same problem a few times now. My leader in
/overseer_elect/leader stops processing the collection queue at
/overseer/collection-queue-work. The queue will build up and it will trigger an
alert in my monitoring tool.
I haven't been able to pinpoint the reason that the leader stops, but usually I
kill the leader node to trigger a leader election. The new node will pick up
the queue. And this is where the problems start.
When the new leader is processing the queue and picks up a reload for a shard
without an active leader, the queue stops. It keeps repeating the message that
there is no active leader for the shard. But a new leader is never elected:
{quote}
ERROR - 2013-12-24 14:43:40.390; org.apache.solr.common.SolrException; Error
while trying to recover.
core=magento_349_shard1_replica1:org.apache.solr.common.SolrException: No
registered leader was found, collection:magento_349 slice:shar
d1
at
org.apache.solr.common.cloud.ZkStateReader.getLeaderRetry(ZkStateReader.java:482)
at
org.apache.solr.common.cloud.ZkStateReader.getLeaderRetry(ZkStateReader.java:465)
at
org.apache.solr.cloud.RecoveryStrategy.doRecovery(RecoveryStrategy.java:317)
at org.apache.solr.cloud.RecoveryStrategy.run(RecoveryStrategy.java:219)
ERROR - 2013-12-24 14:43:40.391; org.apache.solr.cloud.RecoveryStrategy;
Recovery failed - trying again... (7) core=magento_349_shard1_replica1
INFO - 2013-12-24 14:43:40.391; org.apache.solr.cloud.RecoveryStrategy; Wait
256.0 seconds before trying to recover again (8)
{quote}
Is the leader election in some way connected to the collection queue? If so,
can this be a deadlock, because it won't elect until the reload is complete?
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