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https://issues.apache.org/jira/browse/SOLR-5577?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13855835#comment-13855835
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Mark Miller commented on SOLR-5577:
-----------------------------------
Our model should be able to handle this better.
Some off the cough remarks:
* Our model should be fine with turning off updates only after the connection
with zk is lost for a while, rather than the moment it's noticed.
* Even if we didn't want to relax the above, we should be able to handle this
case better - if the issue is that ZooKeeper is actually unavailable, we won't
get new leaders or anything anyway, so no reason to be too concerned about
turning off updates. Not sure how easy that is to detect though.
> indexing delay due to zookeeper election
> ----------------------------------------
>
> Key: SOLR-5577
> URL: https://issues.apache.org/jira/browse/SOLR-5577
> Project: Solr
> Issue Type: Bug
> Reporter: Christine Poerschke
>
> The behaviour we observed was that a zookeeper election took about 2s plus
> 1.5s for reading the zoo_data snapshot. During this time solr tried to
> establish connections to any zookeeper in the ensemble but only succeeded
> once a leader was elected *and* that leader was done reading the snapshot.
> Solr document updates were slowed down during this time window.
> Is this expected to happen during and shortly after elections, that is
> zookeeper closing existing connections, rejecting new connections and thus
> stalling solr updates?
> Other than avoiding zookeeper elections, are there ways of reducing their
> impact on solr?
> +zookeeper log extract+
> {noformat}
> 08:18:54,968 [QuorumCnxManager.java:762] Connection broken for id ...
> 08:18:56,916 [Leader.java:345] LEADING - LEADER ELECTION TOOK - 1941
> 08:18:56,918 [FileSnap.java:83] Reading snapshot ...
> ...
> 08:18:57,010 [NIOServerCnxnFactory.java:197] Accepted socket connection from
> ...
> 08:18:57,010 [NIOServerCnxn.java:354] Exception causing close of session 0x0
> due to java.io.IOException: ZooKeeperServer not running
> 08:18:57,010 [NIOServerCnxn.java:1001] Closed socket connection for client
> ... (no session established for client)
> ...
> 08:18:58,496 [FileTxnSnapLog.java:240] Snapshotting: ... to ...
> {noformat}
> +solr log extract+
> {noformat}
> 08:18:54,968 [ClientCnxn.java:1085] Unable to read additional data from
> server sessionid ... likely server has closed socket, closing socket
> connection and attempting reconnect
> 08:18:55,068 [ConnectionManager.java:72] Watcher
> org.apache.solr.common.cloud.ConnectionManager@... name:ZooKeeperConnection
> Watcher:host1:port1,host2:port2,host3:port3,... got event WatchedEvent
> state:Disconnected type:None path:null path:null type:None
> 08:18:55,068 [ConnectionManager.java:132] zkClient has disconnected
> ...
> 08:18:55,961 [ClientCnxn.java:966] Opening socket connection to server ...
> 08:18:55,961 [ClientCnxn.java:849] Socket connection established to ...
> 08:18:55,962 [ClientCnxn.java:1085] Unable to read additional data from
> server sessionid ... likely server has closed socket, closing socket
> connection and attempting reconnect
> ...
> 08:18:56,714 [ClientCnxn.java:966] Opening socket connection to server ...
> 08:18:56,715 [ClientCnxn.java:849] Socket connection established to ...
> 08:18:56,715 [ClientCnxn.java:1085] Unable to read additional data from ...
> ...
> 08:18:57,640 [ClientCnxn.java:966] Opening socket connection to server ...
> 08:18:57,641 [ClientCnxn.java:849] Socket connection established to ...
> 08:18:57,641 [ClientCnxn.java:1085] Unable to read additional data from ...
> ...
> 08:18:58,352 [ClientCnxn.java:966] Opening socket connection to server ...
> 08:18:58,353 [ClientCnxn.java:849] Socket connection established to ...
> 08:18:58,353 [ClientCnxn.java:1085] Unable to read additional data from ...
> ...
> 08:18:58,749 [ClientCnxn.java:966] Opening socket connection to server ...
> 08:18:58,749 [ClientCnxn.java:849] Socket connection established to ...
> 08:18:58,751 [ClientCnxn.java:1207] Session establishment complete on server
> ... sessionid = ..., negotiated timeout = ...
> 08:18:58,751 ... [ConnectionManager.java:72] Watcher
> org.apache.solr.common.cloud.ConnectionManager@... name:ZooKeeperConnection
> Watcher:host1:port1,host2:port2,host3:port3,... got event WatchedEvent
> state:SyncConnected type:None path:null path:null type:None
> {noformat}
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