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https://issues.apache.org/jira/browse/ZOOKEEPER-3311?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16846072#comment-16846072
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Hudson commented on ZOOKEEPER-3311:
-----------------------------------
FAILURE: Integrated in Jenkins build Zookeeper-trunk-single-thread #368 (See
[https://builds.apache.org/job/Zookeeper-trunk-single-thread/368/])
ZOOKEEPER-3311: Allow a delay to the transaction log flush (eolivelli: rev
cc431f70020b9a2028edcc61e41cff9ee85b078f)
* (edit)
zookeeper-server/src/main/java/org/apache/zookeeper/server/ZooKeeperServer.java
* (edit)
zookeeper-server/src/main/java/org/apache/zookeeper/server/SyncRequestProcessor.java
* (edit)
zookeeper-server/src/main/java/org/apache/zookeeper/server/ZooKeeperServerBean.java
* (edit) zookeeper-docs/src/main/resources/markdown/zookeeperAdmin.md
* (edit)
zookeeper-server/src/main/java/org/apache/zookeeper/server/ZooKeeperServerMXBean.java
> Allow a delay to the transaction log flush
> -------------------------------------------
>
> Key: ZOOKEEPER-3311
> URL: https://issues.apache.org/jira/browse/ZOOKEEPER-3311
> Project: ZooKeeper
> Issue Type: New Feature
> Components: server
> Affects Versions: 3.6.0
> Reporter: Brian Nixon
> Assignee: Brian Nixon
> Priority: Minor
> Labels: pull-request-available
> Fix For: 3.6.0
>
> Time Spent: 2h
> Remaining Estimate: 0h
>
> The SyncRequestProcessor flushes writes to disk either when 1000 writes are
> pending to be flushed or when the processor fails to retrieve another write
> from its incoming queue. The "flush when queue empty" condition operates
> poorly under many workloads as it can quickly degrade into flushing after
> every write -- losing all benefits of batching and leading to a continuous
> stream of flushes + fsyncs which overwhelm the underlying disk.
>
> A configurable flush delay would ensure flushes do not happen more frequently
> than once every X milliseconds. This can be used in-place of or jointly with
> batch size triggered flushes.
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