cassandra-commits mailing list archives

Site index · List index
Message view « Date » · « Thread »
Top « Date » · « Thread »
From "Matthew F. Dennis (JIRA)" <>
Subject [jira] Commented: (CASSANDRA-1188) multiget_slice calls do not close files resulting in file descriptor leak
Date Mon, 14 Jun 2010 18:47:14 GMT


Matthew F. Dennis commented on CASSANDRA-1188:

not all GC implementations close file descriptors when the objects are collected.  Apparently
the one you're using on OSX does.  Curious though, you didn't see *any* ballooning?  If OSX
was releasing the descriptors when the objects were collected, I would expect to see a few
hundred open files while reading in a loop on OSX and only a handful after the patch.

random thought: It may also be a difference in memmapped IO versus not - perhaps OSX doesn't
use it (or isn't configured to)?

> multiget_slice calls do not close files resulting in file descriptor leak
> -------------------------------------------------------------------------
>                 Key: CASSANDRA-1188
>                 URL:
>             Project: Cassandra
>          Issue Type: Bug
>          Components: Core
>    Affects Versions: 0.7
>         Environment: Ubuntu 10.04
>            Reporter: Matt Conway
>            Assignee: Matthew F. Dennis
>            Priority: Critical
>             Fix For: 0.7
>         Attachments: 0001-trunk-1188.patch
> Insert  1000 rows into a super column family. Read them back in a loop using multiget_slice.
Note leaked file descriptors with lsof:
> lsof -p `ps ax | grep [C]assandraDaemon | awk '{print $1}'` | awk '{print $9}' | sort
| uniq -c | sort -n | tail -n 5
> Looks like SSTableNamesIterator is never closing the files it creates via the sstable
> This is similar to CASSANDRA-1178 except for use of multiget_slice instead of get_slice

This message is automatically generated by JIRA.
You can reply to this email to add a comment to the issue online.

View raw message