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https://issues.apache.org/jira/browse/CASSANDRA-10393?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
 ]

Jeff Jirsa resolved CASSANDRA-10393.
------------------------------------
    Resolution: Cannot Reproduce

Closing as cant-repro; reopen if you can repro reliably. 

> LEAK DETECTED: a reference (org.apache.cassandra.utils.concurrent.Ref)
> ----------------------------------------------------------------------
>
>                 Key: CASSANDRA-10393
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-10393
>             Project: Cassandra
>          Issue Type: Bug
>         Environment: v 2.2.1 (from apt)
> -> lsb_release -a
> No LSB modules are available.
> Distributor ID:       Debian
> Description:  Debian GNU/Linux 7.8 (wheezy)
> Release:      7.8
> Codename:     wheezy
> -> java -version
> java version "1.8.0_60"
> Java(TM) SE Runtime Environment (build 1.8.0_60-b27)
> Java HotSpot(TM) 64-Bit Server VM (build 25.60-b23, mixed mode)
>            Reporter: Christian Winther
>            Priority: Major
>              Labels: memory-leak, proposed-cantrepro, sstable
>             Fix For: 2.2.x
>
>
> When trying to repair full on a table with the following schema my nodes 
> stall 
> and end up with spamming this 
> I've recently changed the table from SizeTieredCompactionStrategy to 
> LeveledCompactionStrategy.
> Coming from 2.1.9 -> 2.2.0 -> 2.2.1 i ran upgradesstable without issue as well
> When trying to full repair post compaction change, I got "out of order" 
> errors. A few google searches later, I was told to "scrub" the keyspace - did 
> that during the night (no problems logged, and no data lost)
> Now a repair just stalls and output memory leaks all over the place 
> {code}
> CREATE KEYSPACE sessions WITH replication = {'class': 'SimpleStrategy', 
> 'replication_factor': '3'}  AND durable_writes = true;
> CREATE TABLE sessions.sessions (
>     id text PRIMARY KEY,
>     client_ip text,
>     controller text,
>     controller_action text,
>     created timestamp,
>     data text,
>     expires timestamp,
>     http_host text,
>     modified timestamp,
>     request_agent text,
>     request_agent_bot boolean,
>     request_path text,
>     site_id int,
>     user_id int
> ) WITH bloom_filter_fp_chance = 0.01
>     AND caching = '{"keys":"NONE", "rows_per_partition":"NONE"}'
>     AND comment = ''
>     AND compaction = {'class': 
> 'org.apache.cassandra.db.compaction.LeveledCompactionStrategy'}
>     AND compression = {'sstable_compression': 
> 'org.apache.cassandra.io.compress.LZ4Compressor'}
>     AND dclocal_read_repair_chance = 0.1
>     AND default_time_to_live = 0
>     AND gc_grace_seconds = 864000
>     AND max_index_interval = 2048
>     AND memtable_flush_period_in_ms = 0
>     AND min_index_interval = 128
>     AND read_repair_chance = 0.0
>     AND speculative_retry = '99.0PERCENTILE';
> {code}
> {code}
> ERROR [Reference-Reaper:1] 2015-09-24 10:25:28,475 Ref.java:187 - LEAK 
> DETECTED: a reference 
> (org.apache.cassandra.utils.concurrent.Ref$State@4428a373) to class 
> org.apache.cassandra.io.sstable.format.SSTableReader$InstanceTidier@1811114765:/data/1/cassandra/sessions/sessions-77dd22f0ab9711e49cbc410c6b6f53a6/la-104037-big
>  was not released before the reference was garbage collected
> ERROR [Reference-Reaper:1] 2015-09-24 10:25:28,475 Ref.java:187 - LEAK 
> DETECTED: a reference 
> (org.apache.cassandra.utils.concurrent.Ref$State@368dd97) to class 
> org.apache.cassandra.io.sstable.format.SSTableReader$InstanceTidier@1811114765:/data/1/cassandra/sessions/sessions-77dd22f0ab9711e49cbc410c6b6f53a6/la-104037-big
>  was not released before the reference was garbage collected
> ERROR [Reference-Reaper:1] 2015-09-24 10:25:28,475 Ref.java:187 - LEAK 
> DETECTED: a reference 
> (org.apache.cassandra.utils.concurrent.Ref$State@66fb78be) to class 
> org.apache.cassandra.io.sstable.format.SSTableReader$InstanceTidier@1811114765:/data/1/cassandra/sessions/sessions-77dd22f0ab9711e49cbc410c6b6f53a6/la-104037-big
>  was not released before the reference was garbage collected
> ERROR [Reference-Reaper:1] 2015-09-24 10:25:28,475 Ref.java:187 - LEAK 
> DETECTED: a reference 
> (org.apache.cassandra.utils.concurrent.Ref$State@9fdd2e6) to class 
> org.apache.cassandra.io.sstable.format.SSTableReader$InstanceTidier@1460906269:/data/1/cassandra/sessions/sessions-77dd22f0ab9711e49cbc410c6b6f53a6/la-104788-big
>  was not released before the reference was garbage collected
> ERROR [Reference-Reaper:1] 2015-09-24 10:25:28,475 Ref.java:187 - LEAK 
> DETECTED: a reference 
> (org.apache.cassandra.utils.concurrent.Ref$State@84fcb91) to class 
> org.apache.cassandra.io.sstable.format.SSTableReader$InstanceTidier@1460906269:/data/1/cassandra/sessions/sessions-77dd22f0ab9711e49cbc410c6b6f53a6/la-104788-big
>  was not released before the reference was garbage collected
> {code}



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