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From "ASF subversion and git services (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (SOLR-5577) indexing delay due to zookeeper election
Date Sun, 05 Jan 2014 18:51:50 GMT

    [ https://issues.apache.org/jira/browse/SOLR-5577?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13862629#comment-13862629
] 

ASF subversion and git services commented on SOLR-5577:
-------------------------------------------------------

Commit 1555610 from [~markrmiller@gmail.com] in branch 'dev/trunk'
[ https://svn.apache.org/r1555610 ]

SOLR-5577: don't start timer thread in constructor

> indexing delay due to zookeeper election
> ----------------------------------------
>
>                 Key: SOLR-5577
>                 URL: https://issues.apache.org/jira/browse/SOLR-5577
>             Project: Solr
>          Issue Type: Bug
>          Components: SolrCloud
>            Reporter: Christine Poerschke
>            Assignee: Mark Miller
>             Fix For: 5.0, 4.7, 4.6.1
>
>         Attachments: SOLR-5577.patch
>
>
> 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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