[
https://issues.apache.org/jira/browse/CASSANDRA-6568?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13894549#comment-13894549
]
Chris Burroughs commented on CASSANDRA-6568:
--------------------------------------------
Possible related mailing list threads:
* http://thread.gmane.org/gmane.comp.db.cassandra.user/38121/focus=38144
* http://thread.gmane.org/gmane.comp.db.cassandra.user/37367/focus=37436
* http://thread.gmane.org/gmane.comp.db.cassandra.user/32387/focus=32394
> sstables incorrectly getting marked as "not live"
> -------------------------------------------------
>
> Key: CASSANDRA-6568
> URL: https://issues.apache.org/jira/browse/CASSANDRA-6568
> Project: Cassandra
> Issue Type: Bug
> Components: Core
> Environment: 1.2.12 with several 1.2.13 patches
> Reporter: Chris Burroughs
> Assignee: Marcus Eriksson
> Fix For: 2.0.6
>
> Attachments: 0001-add-jmx-method-to-get-non-active-sstables.patch
>
>
> {noformat}
> -rw-rw-r-- 14 cassandra cassandra 1.4G Nov 25 19:46
> /data/sstables/data/ks/cf/ks-cf-ic-402383-Data.db
> -rw-rw-r-- 14 cassandra cassandra 13G Nov 26 00:04
> /data/sstables/data/ks/cf/ks-cf-ic-402430-Data.db
> -rw-rw-r-- 14 cassandra cassandra 13G Nov 26 05:03
> /data/sstables/data/ks/cf/ks-cf-ic-405231-Data.db
> -rw-rw-r-- 31 cassandra cassandra 21G Nov 26 08:38
> /data/sstables/data/ks/cf/ks-cf-ic-405232-Data.db
> -rw-rw-r-- 2 cassandra cassandra 2.6G Dec 3 13:44
> /data/sstables/data/ks/cf/ks-cf-ic-434662-Data.db
> -rw-rw-r-- 14 cassandra cassandra 1.5G Dec 5 09:05
> /data/sstables/data/ks/cf/ks-cf-ic-438698-Data.db
> -rw-rw-r-- 2 cassandra cassandra 3.1G Dec 6 12:10
> /data/sstables/data/ks/cf/ks-cf-ic-440983-Data.db
> -rw-rw-r-- 2 cassandra cassandra 96M Dec 8 01:52
> /data/sstables/data/ks/cf/ks-cf-ic-444041-Data.db
> -rw-rw-r-- 2 cassandra cassandra 3.3G Dec 9 16:37
> /data/sstables/data/ks/cf/ks-cf-ic-451116-Data.db
> -rw-rw-r-- 2 cassandra cassandra 876M Dec 10 11:23
> /data/sstables/data/ks/cf/ks-cf-ic-453552-Data.db
> -rw-rw-r-- 2 cassandra cassandra 891M Dec 11 03:21
> /data/sstables/data/ks/cf/ks-cf-ic-454518-Data.db
> -rw-rw-r-- 2 cassandra cassandra 102M Dec 11 12:27
> /data/sstables/data/ks/cf/ks-cf-ic-455429-Data.db
> -rw-rw-r-- 2 cassandra cassandra 906M Dec 11 23:54
> /data/sstables/data/ks/cf/ks-cf-ic-455533-Data.db
> -rw-rw-r-- 1 cassandra cassandra 214M Dec 12 05:02
> /data/sstables/data/ks/cf/ks-cf-ic-456426-Data.db
> -rw-rw-r-- 1 cassandra cassandra 203M Dec 12 10:49
> /data/sstables/data/ks/cf/ks-cf-ic-456879-Data.db
> -rw-rw-r-- 1 cassandra cassandra 49M Dec 12 12:03
> /data/sstables/data/ks/cf/ks-cf-ic-456963-Data.db
> -rw-rw-r-- 18 cassandra cassandra 20G Dec 25 01:09
> /data/sstables/data/ks/cf/ks-cf-ic-507770-Data.db
> -rw-rw-r-- 3 cassandra cassandra 12G Jan 8 04:22
> /data/sstables/data/ks/cf/ks-cf-ic-567100-Data.db
> -rw-rw-r-- 3 cassandra cassandra 957M Jan 8 22:51
> /data/sstables/data/ks/cf/ks-cf-ic-569015-Data.db
> -rw-rw-r-- 2 cassandra cassandra 923M Jan 9 17:04
> /data/sstables/data/ks/cf/ks-cf-ic-571303-Data.db
> -rw-rw-r-- 1 cassandra cassandra 821M Jan 10 08:20
> /data/sstables/data/ks/cf/ks-cf-ic-574642-Data.db
> -rw-rw-r-- 1 cassandra cassandra 18M Jan 10 08:48
> /data/sstables/data/ks/cf/ks-cf-ic-574723-Data.db
> {noformat}
> I tried to do a user defined compaction on sstables from November and got "it
> is not an active sstable". Live sstable count from jmx was about 7 while on
> disk there were over 20. Live vs total size showed about a ~50 GiB
> difference.
> Forcing a gc from jconsole had no effect. However, restarting the node
> resulted in live sstables/bytes *increasing* to match what was on disk. User
> compaction could now compact the November sstables. This cluster was last
> restarted in mid December.
> I'm not sure what affect "not live" had on other operations of the cluster.
> From the logs it seems that the files were sent at least at some point as
> part of repair, but I don't know if they were being being used for read
> requests or not. Because the problem that got me looking in the first place
> was poor performance I suspect they were used for reads (and the reads were
> slow because so many sstables were being read). I presume based on their age
> at the least they were being excluded from compaction.
> I'm not aware of any isLive() or getRefCount() to problematically confirm
> which nodes have this problem. In this cluster almost all columns have a 14
> day TTL, based on the number of nodes with November sstables it appears to be
> occurring on a significant fraction of the nodes.
--
This message was sent by Atlassian JIRA
(v6.1.5#6160)
