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From "Phabricator (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HIVE-3000) Potential infinite loop / log spew in ZookeeperHiveLockManager
Date Sun, 06 May 2012 05:40:16 GMT

     [ https://issues.apache.org/jira/browse/HIVE-3000?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Phabricator updated HIVE-3000:
------------------------------

    Attachment: HIVE-3000.D3063.1.patch

njain requested code review of "HIVE-3000 [jira] Potential infinite loop / log spew in ZookeeperHiveLockManager".
Reviewers: JIRA

  https://issues.apache.org/jira/browse/HIVE-3000

  HIVE-3000 infinite loop in ZooKeeperHiveLockManager

  See ZookeeperHiveLockManger.lock()

  If Zookeeper is in a bad state, it's possible to get an exception (e.g. org.apache.zookeeper.KeeperException$SessionExpiredException)
when we call lockPrimitive(). There is a bug in the exception handler where the loop does
not exit because the break in the switch statement gets out the switch, not the do..while
loop. Because tryNum was not incremented due to the exception, lockPrimitive() will be called
in an infinite loop, as fast as possible. Since the exception is printed for each call, Hive
will produce significant log spew.

TEST PLAN
  EMPTY

REVISION DETAIL
  https://reviews.facebook.net/D3063

AFFECTED FILES
  ql/src/java/org/apache/hadoop/hive/ql/lockmgr/zookeeper/ZooKeeperHiveLockManager.java

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> Potential infinite loop / log spew in ZookeeperHiveLockManager
> --------------------------------------------------------------
>
>                 Key: HIVE-3000
>                 URL: https://issues.apache.org/jira/browse/HIVE-3000
>             Project: Hive
>          Issue Type: Bug
>          Components: Locking
>    Affects Versions: 0.9.0
>            Reporter: Paul Yang
>         Attachments: HIVE-3000.D3063.1.patch
>
>
> See ZookeeperHiveLockManger.lock()
> If Zookeeper is in a bad state, it's possible to get an exception (e.g. org.apache.zookeeper.KeeperException$SessionExpiredException)
when we call lockPrimitive(). There is a bug in the exception handler where the loop does
not exit because the break in the switch statement gets out the switch, not the do..while
loop. Because tryNum was not incremented due to the exception, lockPrimitive() will be called
in an infinite loop, as fast as possible. Since the exception is printed for each call, Hive
will produce significant log spew.

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