Solr
  1. Solr
  2. SOLR-5577

indexing delay due to zookeeper election

    Details

    • Type: Bug Bug
    • Status: Closed
    • Priority: Major Major
    • Resolution: Fixed
    • Affects Version/s: None
    • Fix Version/s: 4.6.1, 4.7, 5.0
    • Component/s: SolrCloud
    • Labels:
      None

      Description

      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

      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 ...
      

      solr log extract

      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
      

        Activity

          People

          • Assignee:
            Mark Miller
            Reporter:
            Christine Poerschke
          • Votes:
            0 Vote for this issue
            Watchers:
            8 Start watching this issue

            Dates

            • Created:
              Updated:
              Resolved:

              Development