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https://issues.apache.org/jira/browse/SOLR-6498?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Raintung Li updated SOLR-6498:
------------------------------
Attachment: SOLR-6498.txt
> LeaderElector sometimes will appear multiple ephemeral nodes in the zookeeper
> -----------------------------------------------------------------------------
>
> Key: SOLR-6498
> URL: https://issues.apache.org/jira/browse/SOLR-6498
> Project: Solr
> Issue Type: Bug
> Components: SolrCloud
> Affects Versions: 4.6.1
> Environment: linux
> Reporter: Raintung Li
> Attachments: SOLR-6498.txt
>
>
> Sometimes overseer_elect/collection_shard_leader_elect election path will
> appear multiple same node different sessionid ephemeral nodes.
> ex.
> 92427566579253248-core_node1-n_0000000032
> 92427566579253249-core_node1-n_0000000033
> I can't trace what it happen. But if that, the result will be the new
> register node can't be elect the leader, we also know the old sessionid
> ephemeral node is invalid, but don't know why it is exist.
> And the other issue :
> joinElection method:
> try {
> leaderSeqPath = zkClient.create(shardsElectZkPath + "/" + id + "-n_",
> null,
> CreateMode.EPHEMERAL_SEQUENTIAL, false);
> context.leaderSeqPath = leaderSeqPath;
> cont = false;
> } catch (ConnectionLossException e) {
> // we don't know if we made our node or not...
> List<String> entries = zkClient.getChildren(shardsElectZkPath, null,
> true);
>
> boolean foundId = false;
> for (String entry : entries) {
> String nodeId = getNodeId(entry);
> if (id.equals(nodeId)) {
> // we did create our node...
> foundId = true;
> break;
> }
> }
> if (!foundId) {
> cont = true;
> if (tries++ > 20) {
> throw new ZooKeeperException(SolrException.ErrorCode.SERVER_ERROR,
> "", e);
> }
> try {
> Thread.sleep(50);
> } catch (InterruptedException e2) {
> Thread.currentThread().interrupt();
> }
> }
> }
> If meet the ConnectionLossException status, maybe will double create the
> ephemeral sequential node.
> For my suggestion, can't trace why create the two ephemeral nodes for the
> same server, but can protect it.
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