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From "Paulo Motta (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (CASSANDRA-6563) TTL histogram compactions not triggered at high "Estimated droppable tombstones" rate
Date Wed, 21 May 2014 20:04:38 GMT

     [ https://issues.apache.org/jira/browse/CASSANDRA-6563?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Paulo Motta updated CASSANDRA-6563:
-----------------------------------

    Attachment: 1.2.16-CASSANDRA-6563-v3.txt

> TTL histogram compactions not triggered at high "Estimated droppable tombstones" rate
> -------------------------------------------------------------------------------------
>
>                 Key: CASSANDRA-6563
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-6563
>             Project: Cassandra
>          Issue Type: Bug
>          Components: Core
>         Environment: 1.2.12ish
>            Reporter: Chris Burroughs
>            Assignee: Paulo Motta
>             Fix For: 1.2.17, 2.0.8
>
>         Attachments: 1.2.16-CASSANDRA-6563-v2.txt, 1.2.16-CASSANDRA-6563-v3.txt, 1.2.16-CASSANDRA-6563.txt,
2.0.7-CASSANDRA-6563.txt, patch-v1-iostat.png, patch-v1-range1.png, patch-v2-range3.png, patched-droppadble-ratio.png,
patched-storage-load.png, patched1-compacted-bytes.png, patched2-compacted-bytes.png, unpatched-droppable-ratio.png,
unpatched-storage-load.png, unpatched1-compacted-bytes.png, unpatched2-compacted-bytes.png
>
>
> I have several column families in a largish cluster where virtually all columns are written
with a (usually the same) TTL.  My understanding of CASSANDRA-3442 is that sstables that have
a high ( > 20%) estimated percentage of droppable tombstones should be individually compacted.
 This does not appear to be occurring with size tired compaction.
> Example from one node:
> {noformat}
> $ ll /data/sstables/data/ks/Cf/*Data.db
> -rw-rw-r-- 31 cassandra cassandra 26651211757 Nov 26 22:59 /data/sstables/data/ks/Cf/ks-Cf-ic-295562-Data.db
> -rw-rw-r-- 31 cassandra cassandra  6272641818 Nov 27 02:51 /data/sstables/data/ks/Cf/ks-Cf-ic-296121-Data.db
> -rw-rw-r-- 31 cassandra cassandra  1814691996 Dec  4 21:50 /data/sstables/data/ks/Cf/ks-Cf-ic-320449-Data.db
> -rw-rw-r-- 30 cassandra cassandra 10909061157 Dec 11 17:31 /data/sstables/data/ks/Cf/ks-Cf-ic-340318-Data.db
> -rw-rw-r-- 29 cassandra cassandra   459508942 Dec 12 10:37 /data/sstables/data/ks/Cf/ks-Cf-ic-342259-Data.db
> -rw-rw-r--  1 cassandra cassandra      336908 Dec 12 12:03 /data/sstables/data/ks/Cf/ks-Cf-ic-342307-Data.db
> -rw-rw-r--  1 cassandra cassandra     2063935 Dec 12 12:03 /data/sstables/data/ks/Cf/ks-Cf-ic-342309-Data.db
> -rw-rw-r--  1 cassandra cassandra         409 Dec 12 12:03 /data/sstables/data/ks/Cf/ks-Cf-ic-342314-Data.db
> -rw-rw-r--  1 cassandra cassandra    31180007 Dec 12 12:03 /data/sstables/data/ks/Cf/ks-Cf-ic-342319-Data.db
> -rw-rw-r--  1 cassandra cassandra     2398345 Dec 12 12:03 /data/sstables/data/ks/Cf/ks-Cf-ic-342322-Data.db
> -rw-rw-r--  1 cassandra cassandra       21095 Dec 12 12:03 /data/sstables/data/ks/Cf/ks-Cf-ic-342331-Data.db
> -rw-rw-r--  1 cassandra cassandra       81454 Dec 12 12:03 /data/sstables/data/ks/Cf/ks-Cf-ic-342335-Data.db
> -rw-rw-r--  1 cassandra cassandra     1063718 Dec 12 12:03 /data/sstables/data/ks/Cf/ks-Cf-ic-342339-Data.db
> -rw-rw-r--  1 cassandra cassandra      127004 Dec 12 12:03 /data/sstables/data/ks/Cf/ks-Cf-ic-342344-Data.db
> -rw-rw-r--  1 cassandra cassandra      146785 Dec 12 12:03 /data/sstables/data/ks/Cf/ks-Cf-ic-342346-Data.db
> -rw-rw-r--  1 cassandra cassandra      697338 Dec 12 12:03 /data/sstables/data/ks/Cf/ks-Cf-ic-342351-Data.db
> -rw-rw-r--  1 cassandra cassandra     3921428 Dec 12 12:03 /data/sstables/data/ks/Cf/ks-Cf-ic-342367-Data.db
> -rw-rw-r--  1 cassandra cassandra      240332 Dec 12 12:03 /data/sstables/data/ks/Cf/ks-Cf-ic-342370-Data.db
> -rw-rw-r--  1 cassandra cassandra       45669 Dec 12 12:03 /data/sstables/data/ks/Cf/ks-Cf-ic-342374-Data.db
> -rw-rw-r--  1 cassandra cassandra    53127549 Dec 12 12:03 /data/sstables/data/ks/Cf/ks-Cf-ic-342375-Data.db
> -rw-rw-r-- 16 cassandra cassandra 12466853166 Dec 25 22:40 /data/sstables/data/ks/Cf/ks-Cf-ic-396473-Data.db
> -rw-rw-r-- 12 cassandra cassandra  3903237198 Dec 29 19:42 /data/sstables/data/ks/Cf/ks-Cf-ic-408926-Data.db
> -rw-rw-r--  7 cassandra cassandra  3692260987 Jan  3 08:25 /data/sstables/data/ks/Cf/ks-Cf-ic-427733-Data.db
> -rw-rw-r--  4 cassandra cassandra  3971403602 Jan  6 20:50 /data/sstables/data/ks/Cf/ks-Cf-ic-437537-Data.db
> -rw-rw-r--  3 cassandra cassandra  1007832224 Jan  7 15:19 /data/sstables/data/ks/Cf/ks-Cf-ic-440331-Data.db
> -rw-rw-r--  2 cassandra cassandra   896132537 Jan  8 11:05 /data/sstables/data/ks/Cf/ks-Cf-ic-447740-Data.db
> -rw-rw-r--  1 cassandra cassandra   963039096 Jan  9 04:59 /data/sstables/data/ks/Cf/ks-Cf-ic-449425-Data.db
> -rw-rw-r--  1 cassandra cassandra   232168351 Jan  9 10:14 /data/sstables/data/ks/Cf/ks-Cf-ic-450287-Data.db
> -rw-rw-r--  1 cassandra cassandra    73126319 Jan  9 11:28 /data/sstables/data/ks/Cf/ks-Cf-ic-450307-Data.db
> -rw-rw-r--  1 cassandra cassandra    40921916 Jan  9 12:08 /data/sstables/data/ks/Cf/ks-Cf-ic-450336-Data.db
> -rw-rw-r--  1 cassandra cassandra    60881193 Jan  9 12:23 /data/sstables/data/ks/Cf/ks-Cf-ic-450341-Data.db
> -rw-rw-r--  1 cassandra cassandra        4746 Jan  9 12:23 /data/sstables/data/ks/Cf/ks-Cf-ic-450350-Data.db
> -rw-rw-r--  1 cassandra cassandra        5769 Jan  9 12:23 /data/sstables/data/ks/Cf/ks-Cf-ic-450352-Data.db
> {noformat}
> {noformat}
> 295562: Estimated droppable tombstones: 0.899035828535183
> 296121: Estimated droppable tombstones: 0.9135080937806197
> 320449: Estimated droppable tombstones: 0.8916766879896414
> {noformat}
> I've checked in on this example node several times and compactionstats has not shown
any other activity that would be blocking the tombstone based compaction.  The TTL is in the
15-20 day range so an sstable from November should have had ample opportunities by January.



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