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https://issues.apache.org/jira/browse/KAFKA-1404?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Xinyao Hu updated KAFKA-1404:
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Description:
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 many 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.
was:
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.
> 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
> Original Estimate: 336h
> Remaining Estimate: 336h
>
> 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 many 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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