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https://issues.apache.org/jira/browse/CASSANDRA-3616?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13170393#comment-13170393
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Brandon Williams commented on CASSANDRA-3616:
---------------------------------------------
I can reproduce this with SizeTieredStrategy.
> Temp SSTable and file descriptor leak
> -------------------------------------
>
> Key: CASSANDRA-3616
> URL: https://issues.apache.org/jira/browse/CASSANDRA-3616
> Project: Cassandra
> Issue Type: Bug
> Components: Core
> Affects Versions: 1.0.5
> Environment: 1.0.5 + CASSANDRA-3532 patch
> Solaris 10
> Reporter: Eric Parusel
>
> Discussion about this started in CASSANDRA-3532. It's on it's own ticket now.
> Anyhow:
> The nodes in my cluster are using a lot of file descriptors, holding open tmp
> files. A few are using 50K+, nearing their limit (on Solaris, of 64K).
> Here's a small snippet of lsof:
> java 828 appdeployer *162u VREG 181,65540 0 333884
> /data1/cassandra/data/MA_DDR/messages_meta-tmp-hb-776518-Data.db
> java 828 appdeployer *163u VREG 181,65540 0 333502
> /data1/cassandra/data/MA_DDR/messages_meta-tmp-hb-776452-Data.db
> java 828 appdeployer *165u VREG 181,65540 0 333929
> /data1/cassandra/data/MA_DDR/messages_meta-tmp-hb-776527-Index.db
> java 828 appdeployer *166u VREG 181,65540 0 333859
> /data1/cassandra/data/MA_DDR/messages_meta-tmp-hb-776514-Data.db
> java 828 appdeployer *167u VREG 181,65540 0 333663
> /data1/cassandra/data/MA_DDR/messages_meta-tmp-hb-776480-Data.db
> java 828 appdeployer *168u VREG 181,65540 0 333812
> /data1/cassandra/data/MA_DDR/messages_meta-tmp-hb-776506-Index.db
> I spot checked a few and found they still exist on the filesystem too:
> rw-rr- 1 appdeployer appdeployer 0 Dec 12 07:16
> /data1/cassandra/data/MA_DDR/messages_meta-tmp-hb-776506-Index.db
> After more investigation, it seems to happen during a CompactionTask.
> I waited until I saw some -tmp- files hanging around in the data dir:
> -rw-r--r-- 1 appdeployer appdeployer 0 Dec 12 21:47:10 2011
> messages_meta-tmp-hb-788904-Data.db
> -rw-r--r-- 1 appdeployer appdeployer 0 Dec 12 21:47:10 2011
> messages_meta-tmp-hb-788904-Index.db
> and then found this in the logs:
> INFO [CompactionExecutor:18839] 2011-12-12 21:47:07,173 CompactionTask.java
> (line 113) Compacting
> [SSTableReader(path='/data1/cassandra/data/MA_DDR/messages_meta-hb-760408-Data.db'),
>
> SSTableReader(path='/data1/cassandra/data/MA_DDR/messages_meta-hb-760413-Data.db'),
>
> SSTableReader(path='/data1/cassandra/data/MA_DDR/messages_meta-hb-760409-Data.db'),
>
> SSTableReader(path='/data1/cassandra/data/MA_DDR/messages_meta-hb-788314-Data.db'),
>
> SSTableReader(path='/data1/cassandra/data/MA_DDR/messages_meta-hb-760407-Data.db'),
>
> SSTableReader(path='/data1/cassandra/data/MA_DDR/messages_meta-hb-760412-Data.db'),
>
> SSTableReader(path='/data1/cassandra/data/MA_DDR/messages_meta-hb-760410-Data.db'),
>
> SSTableReader(path='/data1/cassandra/data/MA_DDR/messages_meta-hb-760411-Data.db')]
> INFO [CompactionExecutor:18839] 2011-12-12 21:47:10,461 CompactionTask.java
> (line 218) Compacted to
> [/data1/cassandra/data/MA_DDR/messages_meta-hb-788896-Data.db,/data1/cassandra/data/MA_DDR/messages_meta-hb-788897-Data.db,/data1/cassandra/data/MA_DDR/messages_meta-hb-788898-Data.db,/data1/cassandra/data/MA_DDR/messages_meta-hb-788899-Data.db,/data1/cassandra/data/MA_DDR/messages_meta-hb-788900-Data.db,/data1/cassandra/data/MA_DDR/messages_meta-hb-788901-Data.db,/data1/cassandra/data/MA_DDR/messages_meta-hb-788902-Data.db,/data1/cassandra/data/MA_DDR/messages_meta-hb-788903-Data.db,].
> 83,899,295 to 83,891,657 (~99% of original) bytes for 75,662 keys at
> 24.332518MB/s. Time: 3,288ms.
> Note that the timestamp of the 2nd log line matches the last modified time of
> the files, and has IDs leading up to, *but not including 788904*.
> I thought this might be relavent information, but I haven't found the
> specific cause yet.
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