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From Erick Erickson <erickerick...@gmail.com>
Subject Re: Questions on SolrCloud core state, when will Solr recover a "DOWN" core to "ACTIVE" core.
Date Wed, 27 Apr 2016 01:20:02 GMT
One of the reasons this happens is if you have very
long GC cycles, longer than the Zookeeper "keep alive"
timeout. During a full GC pause, Solr is unresponsive and
if the ZK ping times out, ZK assumes the machine is
gone and you get into this recovery state.

So I'd collect GC logs and see if you have any
stop-the-world GC pauses that take longer than the ZK
timeout.

see Mark Millers primer on GC here:
https://lucidworks.com/blog/2011/03/27/garbage-collection-bootcamp-1-0/

Best,
Erick

On Tue, Apr 26, 2016 at 2:13 PM, Li Ding <li.ding@bloomreach.com> wrote:
> Thank you all for your help!
>
> The zookeeper log rolled over, thisis from Solr.log:
>
> Looks like the solr and zk connection is gone for some reason
>
> INFO  - 2016-04-21 12:37:57.536;
> org.apache.solr.common.cloud.ConnectionManager; Watcher
> org.apache.solr.common.cloud.ConnectionManager@19789a96
> name:ZooKeeperConnection Watcher:{ZK HOSTS here} got event WatchedEvent
> state:Disconnected type:None path:null path:null type:None
>
> INFO  - 2016-04-21 12:37:57.536;
> org.apache.solr.common.cloud.ConnectionManager; zkClient has disconnected
>
> INFO  - 2016-04-21 12:38:24.248;
> org.apache.solr.common.cloud.DefaultConnectionStrategy; Connection expired
> - starting a new one...
>
> INFO  - 2016-04-21 12:38:24.262;
> org.apache.solr.common.cloud.ConnectionManager; Waiting for client to
> connect to ZooKeeper
>
> INFO  - 2016-04-21 12:38:24.269;
> org.apache.solr.common.cloud.ConnectionManager; Connected:true
>
>
> Then it publishes all cores on the hosts are down.  I just list three cores
> here:
>
> INFO  - 2016-04-21 12:38:24.269; org.apache.solr.cloud.ZkController;
> publishing core=product1_shard1_replica1 state=down
>
> INFO  - 2016-04-21 12:38:24.271; org.apache.solr.cloud.ZkController;
> publishing core=collection1 state=down
>
> INFO  - 2016-04-21 12:38:24.272; org.apache.solr.cloud.ZkController;
> numShards not found on descriptor - reading it from system property
>
> INFO  - 2016-04-21 12:38:24.289; org.apache.solr.cloud.ZkController;
> publishing core=product2_shard5_replica1 state=down
>
> INFO  - 2016-04-21 12:38:24.292; org.apache.solr.cloud.ZkController;
> publishing core=product2_shard13_replica1 state=down
>
>
> product1 has only one shard one replica and it's able to be active
> successfully:
>
> INFO  - 2016-04-21 12:38:26.383; org.apache.solr.cloud.ZkController;
> Register replica - core:product1_shard1_replica1 address:http://
> {internalIp}:8983/solr collection:product1 shard:shard1
>
> WARN  - 2016-04-21 12:38:26.385; org.apache.solr.cloud.ElectionContext;
> cancelElection did not find election node to remove
>
> INFO  - 2016-04-21 12:38:26.393;
> org.apache.solr.cloud.ShardLeaderElectionContext; Running the leader
> process for shard shard1
>
> INFO  - 2016-04-21 12:38:26.399;
> org.apache.solr.cloud.ShardLeaderElectionContext; Enough replicas found to
> continue.
>
> INFO  - 2016-04-21 12:38:26.399;
> org.apache.solr.cloud.ShardLeaderElectionContext; I may be the new leader -
> try and sync
>
> INFO  - 2016-04-21 12:38:26.399; org.apache.solr.cloud.SyncStrategy; Sync
> replicas to http://{internalIp}:8983/solr/product1_shard1_replica1/
>
> INFO  - 2016-04-21 12:38:26.399; org.apache.solr.cloud.SyncStrategy; Sync
> Success - now sync replicas to me
>
> INFO  - 2016-04-21 12:38:26.399; org.apache.solr.cloud.SyncStrategy;
> http://{internalIp}:8983/solr/product1_shard1_replica1/
> has no replicas
>
> INFO  - 2016-04-21 12:38:26.399;
> org.apache.solr.cloud.ShardLeaderElectionContext; I am the new leader:
> http://{internalIp}:8983/solr/product1_shard1_replica1/ shard1
>
> INFO  - 2016-04-21 12:38:26.399; org.apache.solr.common.cloud.SolrZkClient;
> makePath: /collections/product1/leaders/shard1
>
> INFO  - 2016-04-21 12:38:26.412; org.apache.solr.cloud.ZkController; We are
> http://{internalIp}:8983/solr/product1_shard1_replica1/ and leader is
> http://{internalIp}:8983/solr/product1_shard1_replica1/
>
> INFO  - 2016-04-21 12:38:26.412; org.apache.solr.cloud.ZkController; No
> LogReplay needed for core=product1_replica1 baseURL=http://
> {internalIp}:8983/solr
>
> INFO  - 2016-04-21 12:38:26.412; org.apache.solr.cloud.ZkController; I am
> the leader, no recovery necessary
>
> INFO  - 2016-04-21 12:38:26.413; org.apache.solr.cloud.ZkController;
> publishing core=product1_shard1_replica1 state=active
>
>
> product2 has 15 shards one replica but only two shards lived on this
> machine, this is one of the failed shard that I never seen the message of
> the core product2_shard5_replica1 active:
>
> INFO  - 2016-04-21 12:38:26.616; org.apache.solr.cloud.ZkController;
> Register replica - product2_shard5_replica1 address:http://
> {internalIp}:8983/solr collection:product2 shard:shard5
>
> WARN  - 2016-04-21 12:38:26.618; org.apache.solr.cloud.ElectionContext;
> cancelElection did not find election node to remove
>
> INFO  - 2016-04-21 12:38:26.625;
> org.apache.solr.cloud.ShardLeaderElectionContext; Running the leader
> process for shard shard5
>
> INFO  - 2016-04-21 12:38:26.631;
> org.apache.solr.cloud.ShardLeaderElectionContext; Enough replicas found to
> continue.
>
> INFO  - 2016-04-21 12:38:26.631;
> org.apache.solr.cloud.ShardLeaderElectionContext; I may be the new leader -
> try and sync
>
> INFO  - 2016-04-21 12:38:26.631; org.apache.solr.cloud.SyncStrategy; Sync
> replicas to http://
> {internalIp}:8983/solr/product2_shard5_replica1_shard5_replica1/
>
> INFO  - 2016-04-21 12:38:26.631; org.apache.solr.cloud.SyncStrategy; Sync
> Success - now sync replicas to me
>
> INFO  - 2016-04-21 12:38:26.632; org.apache.solr.cloud.SyncStrategy;
> http://{internalIp}:8983/solr/product2_shard5_replica1_shard5_replica1/
> has no replicas
>
> INFO  - 2016-04-21 12:38:26.632;
> org.apache.solr.cloud.ShardLeaderElectionContext; I am the new leader:
> http://{internalIp}:8983/solr/product2_shard5_replica1_shard5_replica1/
> shard5
>
> INFO  - 2016-04-21 12:38:26.632; org.apache.solr.common.cloud.SolrZkClient;
> makePath: /collections/product2_shard5_replica1/leaders/shard5
>
> INFO  - 2016-04-21 12:38:26.645; org.apache.solr.cloud.ZkController; We are
> http://{internalIp}:8983/solr/product2_shard5_replica1_shard5_replica1/ and
> leader is http://{internalIp}:8983/solr
> product2_shard5_replica1_shard5_replica1/
>
> INFO  - 2016-04-21 12:38:26.646;
> org.apache.solr.common.cloud.ZkStateReader; Updating cloud state from
> ZooKeeper...
>
>
> Before I restarted this server, a bunch of queries failed for this
> collection product2.  But I don't think it will affect the core status.
>
>
> Do you guys have any idea about why this particular core is not published
> as active since from the log, most steps are done except the very last one
> to publish info to ZK.
>
>
> Thanks,
>
>
> Li
> On Thu, Apr 21, 2016 at 7:08 AM, Rajesh Hazari <rajeshhazari@gmail.com>
> wrote:
>
>> Hi Li,
>>
>> Do you see timeouts liek "CLUSTERSTATUS the collection time out:180s"
>> if its the case, this may be related to
>> https://issues.apache.org/jira/browse/SOLR-7940,
>> and i would say either use the patch file or upgrade.
>>
>>
>> *Thanks,*
>> *Rajesh,*
>> *8328789519,*
>> *If I don't answer your call please leave a voicemail with your contact
>> info, *
>> *will return your call ASAP.*
>>
>> On Thu, Apr 21, 2016 at 6:02 AM, YouPeng Yang <yypvsxf19870706@gmail.com>
>> wrote:
>>
>> > Hi
>> >    We have used Solr4.6 for 2 years,If you post more logs ,maybe we can
>> > fixed it.
>> >
>> > 2016-04-21 6:50 GMT+08:00 Li Ding <li.ding@bloomreach.com>:
>> >
>> > > Hi All,
>> > >
>> > > We are using SolrCloud 4.6.1.  We have observed following behaviors
>> > > recently.  A Solr node in a Solrcloud cluster is up but some of the
>> cores
>> > > on the nodes are marked as down in Zookeeper.  If the cores are parts
>> of
>> > a
>> > > multi-sharded collection with one replica,  the queries to that
>> > collection
>> > > will fail.  However, when this happened, if we issue queries to the
>> core
>> > > directly, it returns 200 and correct info.  But once Solr got into the
>> > > state, the core will be marked down forever unless we do a restart on
>> > Solr.
>> > >
>> > > Has anyone seen this behavior before?  Is there any to get out of the
>> > state
>> > > on its own?
>> > >
>> > > Thanks,
>> > >
>> > > Li
>> > >
>> >
>>

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