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https://issues.apache.org/jira/browse/SOLR-5577?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13855877#comment-13855877
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Ramkumar Aiyengar commented on SOLR-5577:
-----------------------------------------
The proposal here is to only relax updating the collection for a while when ZK
connection is lost. If a shard updates its state, wouldn't the Overseer have to
process the state update? That would still continue to fail till ZK comes back
up.
> 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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