Brian Nixon created ZOOKEEPER-3311:
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Summary: 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
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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