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From "Hudson (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (ZOOKEEPER-3347) Improve PathTrie Consistency
Date Fri, 09 Aug 2019 20:18:00 GMT

    [ https://issues.apache.org/jira/browse/ZOOKEEPER-3347?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16904166#comment-16904166
] 

Hudson commented on ZOOKEEPER-3347:
-----------------------------------

FAILURE: Integrated in Jenkins build ZooKeeper-trunk #655 (See [https://builds.apache.org/job/ZooKeeper-trunk/655/])
ZOOKEEPER-3347: Improve PathTrie Consistency (andor: rev 04cc5cae1e7d4b007490e68109a676b88ce790a3)
* (add) zookeeper-server/src/test/java/org/apache/zookeeper/common/PathTrieTest.java
* (edit) zookeeper-server/src/main/java/org/apache/zookeeper/common/PathTrie.java
* (edit) zookeeper-server/src/main/java/org/apache/zookeeper/server/DataTree.java
* (edit) zookeeper-server/src/test/java/org/apache/zookeeper/server/DataTreeTest.java


> Improve PathTrie Consistency 
> -----------------------------
>
>                 Key: ZOOKEEPER-3347
>                 URL: https://issues.apache.org/jira/browse/ZOOKEEPER-3347
>             Project: ZooKeeper
>          Issue Type: Improvement
>          Components: server
>            Reporter: David Mollitor
>            Assignee: David Mollitor
>            Priority: Major
>              Labels: pull-request-available
>             Fix For: 3.6.0
>
>          Time Spent: 3h 50m
>  Remaining Estimate: 0h
>
> There is a bunch of synchronization that occurs in the {{PathTrie}}.  Each node in the
tree requires a lock to view its children, so to traverse a tree that is 8 nodes deep, it
is required to lock 8 different times.  Also, I'm not really sure that the locking is consistent;
a node deep in the tree can be negatively impacted by another thread deleting the node's parent
at the same time.



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