Xinyao Hu created KAFKA-1404:
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Summary: Close unused log file
Key: KAFKA-1404
URL: https://issues.apache.org/jira/browse/KAFKA-1404
Project: Kafka
Issue Type: Improvement
Components: core
Affects Versions: 0.8.1
Reporter: Xinyao Hu
Priority: Critical
This is some what related to KAFKA-1403.
One way to hack KAFKA-1403 is to roll a new file in a short period of time.
However, this will result in much more file descriptor open. Take our
application for example, each server hosts about 5k topic-partition, if we roll
a new file per hour, we will have over 100k file descriptors open (I checked
only .log is open but not .index which might be pinned in memory).
In most of the application, very few of these file descriptors will be read. We
should provide a parameter like max.num.fds and do LRU inside kafka to decide
which fds should be open.
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