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Posted to issues@hbase.apache.org by "Gregory Chanan (JIRA)" <ji...@apache.org> on 2013/01/11 22:12:13 UTC
[jira] [Updated] (HBASE-6775) Use ZK.multi when available for
HBASE-6710 0.92/0.94 compatibility fix
[ https://issues.apache.org/jira/browse/HBASE-6775?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Gregory Chanan updated HBASE-6775:
----------------------------------
Description:
This issue introduces the ability for the HMaster to make use of ZooKeeper's multi-update functionality. This allows certain ZooKeeper operations to complete more quickly and prevents some issues with rare ZooKeeper failure scenarios (see the release note of HBASE-6710 for an example). This feature is off by default; to enable set "hbase.zookeeper.useMulti" to true in the configuration of the HMaster.
IMPORTANT: "hbase.zookeeper.useMulti" should only be set to true if all ZooKeeper servers in the cluster are on version 3.4+ and will not be downgraded. ZooKeeper versions before 3.4 do not support multi-update and will not fail gracefully if multi-update is invoked (see ZOOKEEPER-1495).
was:
HBASE-6710 fixed a 0.92/0.94 compatibility issue by writing two znodes in different formats.
If a ZK failure occurs between the writing of the two znodes, strange behavior can result.
This issue is a reminder to change these two ZK writes to use ZK.multi when we require ZK 3.4+.
Release Note:
hbase.zookeeper.useMulti
Instructs HBase to make use of ZooKeeper's multi-update functionality.
+ This allows certain ZooKeeper operations to complete more quickly and prevents some issues
+ with rare ZooKeeper failure scenarios (see the release note of HBASE-6710 for an example).
+ IMPORTANT: only set this to true if all ZooKeeper servers in the cluster are on version 3.4+
+ and will not be downgraded. ZooKeeper versions before 3.4 do not support multi-update and will
+ not fail gracefully if multi-update is invoked (see ZOOKEEPER-1495).
> Use ZK.multi when available for HBASE-6710 0.92/0.94 compatibility fix
> ----------------------------------------------------------------------
>
> Key: HBASE-6775
> URL: https://issues.apache.org/jira/browse/HBASE-6775
> Project: HBase
> Issue Type: Improvement
> Components: Zookeeper
> Affects Versions: 0.94.2
> Reporter: Gregory Chanan
> Assignee: Gregory Chanan
> Priority: Minor
> Fix For: 0.94.4
>
> Attachments: HBASE-6775-v2.patch
>
>
> This issue introduces the ability for the HMaster to make use of ZooKeeper's multi-update functionality. This allows certain ZooKeeper operations to complete more quickly and prevents some issues with rare ZooKeeper failure scenarios (see the release note of HBASE-6710 for an example). This feature is off by default; to enable set "hbase.zookeeper.useMulti" to true in the configuration of the HMaster.
> IMPORTANT: "hbase.zookeeper.useMulti" should only be set to true if all ZooKeeper servers in the cluster are on version 3.4+ and will not be downgraded. ZooKeeper versions before 3.4 do not support multi-update and will not fail gracefully if multi-update is invoked (see ZOOKEEPER-1495).
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