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https://issues.apache.org/jira/browse/CASSANDRA-18176?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17687171#comment-17687171
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Benedict Elliott Smith edited comment on CASSANDRA-18176 at 2/10/23 4:39 PM:
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As part of any backport work, do you want to perhaps take a look at why we
aren't seeing the strong loop detection errors anywhere in our CI, or if we are
why they aren't being surfaced? Or perhaps just create a dedicated strong loop
test that makes sure to run the detector at least once after running some basic
tasks?
This is a pretty serious issue really, as it completely disables all of our
leak detection which is obviously very important. So we want to catch mistakes
here as early as possible.
was (Author: benedict):
As part of any backport work, do you want to perhaps take a look at why we
aren't seeing the strong loop detection errors anywhere in our CI, or if we are
why they aren't being surfaced? Or perhaps just create a dedicated strong loop
test that makes sure to run the detector at least once after running some basic
tasks?
> Merged SSTable files not reclaimed by OS
> ----------------------------------------
>
> Key: CASSANDRA-18176
> URL: https://issues.apache.org/jira/browse/CASSANDRA-18176
> Project: Cassandra
> Issue Type: Bug
> Components: Local/Compaction
> Reporter: Pere Balaguer
> Priority: Normal
> Fix For: 4.0.x
>
>
> (EDIT: Looks like this is masked by the lack of backport of CASSANDRA-17205
> just on the 4.0 line - will backport that and block here on it)
> After upgrading to Cassandra 4.x (4.0.1 and 4.0.5) we've noticed that at
> times after a compaction deleted sstables diskspace doesn't get reclaimed by
> the OS until the cassandra process is restarted (which kinda points at some
> sort of resource leak), I do not recall this happening in cassandra 3, at
> least not to such degree.
> We've seen the behavior in multiple clusters with different schemas, access
> patterns and consistency levels at somewhat "random" points in time, the only
> interesting thing is that there were active repair sessions at the time
> affecting the node, keyspace and table.
> {noformat}
> $ date +%Y-%m-%d
> 2023-01-17
> $ nodetool version
> ReleaseVersion: 4.0.5
> {noformat}
> {noformat}
> $ lsof +L1 | grep cassandra | grep myawesomecluster | wc -l
> 2772
> $ lsof +L1 | grep cassandra | grep myawesomecluster | tail -n1
> java 59003 cassandra *979u REG 253,8 10 0 1208053768
> /cassandra-data/data/myawesomecluster/schema_one-randomchecksum/nb-2274426-big-Digest.crc32
> (deleted)
> {noformat}
> {noformat}
> $ grep 2274426 /cassandra/systemlog.log
> INFO [Stream-Deserializer-/10.214.79.62:randomport-b904af67] 2023-01-15
> 13:06:24,969 BigTableZeroCopyWriter.java:203 - Writing component DATA to
> /cassandra-data/data/myawesomecluster/schema_one-randomchecksum/nb-2274426-big-Data.db
> length 2.900KiB
> INFO [Stream-Deserializer-/10.214.79.62:randomport-b904af67] 2023-01-15
> 13:06:24,969 BigTableZeroCopyWriter.java:213 - Block Writing component to
> /cassandra-data/data/myawesomecluster/schema_one-randomchecksum/nb-2274426-big-Data.db
> length 2.900KiB
> INFO [Stream-Deserializer-/10.214.79.62:randomport-b904af67] 2023-01-15
> 13:06:24,970 BigTableZeroCopyWriter.java:203 - Writing component
> PRIMARY_INDEX to
> /cassandra-data/data/myawesomecluster/schema_one-randomchecksum/nb-2274426-big-Index.db
> length 3.739KiB
> INFO [Stream-Deserializer-/10.214.79.62:randomport-b904af67] 2023-01-15
> 13:06:24,970 BigTableZeroCopyWriter.java:213 - Block Writing component to
> /cassandra-data/data/myawesomecluster/schema_one-randomchecksum/nb-2274426-big-Index.db
> length 3.739KiB
> INFO [Stream-Deserializer-/10.214.79.62:randomport-b904af67] 2023-01-15
> 13:06:24,970 BigTableZeroCopyWriter.java:203 - Writing component STATS to
> /cassandra-data/data/myawesomecluster/schema_one-randomchecksum/nb-2274426-big-Statistics.db
> length 5.062KiB
> INFO [Stream-Deserializer-/10.214.79.62:randomport-b904af67] 2023-01-15
> 13:06:24,970 BigTableZeroCopyWriter.java:213 - Block Writing component to
> /cassandra-data/data/myawesomecluster/schema_one-randomchecksum/nb-2274426-big-Statistics.db
> length 5.062KiB
> INFO [Stream-Deserializer-/10.214.79.62:randomport-b904af67] 2023-01-15
> 13:06:24,971 BigTableZeroCopyWriter.java:203 - Writing component
> COMPRESSION_INFO to
> /cassandra-data/data/myawesomecluster/schema_one-randomchecksum/nb-2274426-big-CompressionInfo.db
> length 0.054KiB
> INFO [Stream-Deserializer-/10.214.79.62:randomport-b904af67] 2023-01-15
> 13:06:24,971 BigTableZeroCopyWriter.java:213 - Block Writing component to
> /cassandra-data/data/myawesomecluster/schema_one-randomchecksum/nb-2274426-big-CompressionInfo.db
> length 0.054KiB
> INFO [Stream-Deserializer-/10.214.79.62:randomport-b904af67] 2023-01-15
> 13:06:24,971 BigTableZeroCopyWriter.java:203 - Writing component FILTER to
> /cassandra-data/data/myawesomecluster/schema_one-randomchecksum/nb-2274426-big-Filter.db
> length 0.031KiB
> INFO [Stream-Deserializer-/10.214.79.62:randomport-b904af67] 2023-01-15
> 13:06:24,971 BigTableZeroCopyWriter.java:213 - Block Writing component to
> /cassandra-data/data/myawesomecluster/schema_one-randomchecksum/nb-2274426-big-Filter.db
> length 0.031KiB
> INFO [Stream-Deserializer-/10.214.79.62:randomport-b904af67] 2023-01-15
> 13:06:24,972 BigTableZeroCopyWriter.java:203 - Writing component SUMMARY to
> /cassandra-data/data/myawesomecluster/schema_one-randomchecksum/nb-2274426-big-Summary.db
> length 0.436KiB
> INFO [Stream-Deserializer-/10.214.79.62:randomport-b904af67] 2023-01-15
> 13:06:24,972 BigTableZeroCopyWriter.java:213 - Block Writing component to
> /cassandra-data/data/myawesomecluster/schema_one-randomchecksum/nb-2274426-big-Summary.db
> length 0.436KiB
> INFO [Stream-Deserializer-/10.214.79.62:randomport-b904af67] 2023-01-15
> 13:06:24,972 BigTableZeroCopyWriter.java:203 - Writing component DIGEST to
> /cassandra-data/data/myawesomecluster/schema_one-randomchecksum/nb-2274426-big-Digest.crc32
> length 0.010KiB
> INFO [Stream-Deserializer-/10.214.79.62:randomport-b904af67] 2023-01-15
> 13:06:24,972 BigTableZeroCopyWriter.java:213 - Block Writing component to
> /cassandra-data/data/myawesomecluster/schema_one-randomchecksum/nb-2274426-big-Digest.crc32
> length 0.010KiB
> INFO [Stream-Deserializer-/10.214.79.62:randomport-b904af67] 2023-01-15
> 13:06:24,974 SSTableReaderBuilder.java:351 - Opening
> /cassandra-data/data/myawesomecluster/schema_one-randomchecksum/nb-2274426-big
> (2.900KiB)
> INFO [CompactionExecutor:54141] 2023-01-15 13:06:24,978
> CompactionTask.java:150 - Compacting (6a3e8320-94d5-11ed-b2c8-7b967b642f39)
> [/cassandra-data/data/myawesomecluster/schema_one-randomchecksum/nb-2274426-big-Data.db:level=0,
>
> /cassandra-data/data/myawesomecluster/schema_one-randomchecksum/nb-2274422-big-Data.db:level=0,
>
> /cassandra-data/data/myawesomecluster/schema_one-randomchecksum/nb-2274411-big-Data.db:level=0,
>
> /cassandra-data/data/myawesomecluster/schema_one-randomchecksum/nb-2274423-big-Data.db:level=0,
>
> /cassandra-data/data/myawesomecluster/schema_one-randomchecksum/nb-2274410-big-Data.db:level=0,
>
> /cassandra-data/data/myawesomecluster/schema_one-randomchecksum/nb-2274412-big-Data.db:level=0,
>
> /cassandra-data/data/myawesomecluster/schema_one-randomchecksum/nb-2274413-big-Data.db:level=0,
>
> /cassandra-data/data/myawesomecluster/schema_one-randomchecksum/nb-2274414-big-Data.db:level=0,
>
> /cassandra-data/data/myawesomecluster/schema_one-randomchecksum/nb-2274419-big-Data.db:level=0,
>
> /cassandra-data/data/myawesomecluster/schema_one-randomchecksum/nb-2274425-big-Data.db:level=0,
>
> /cassandra-data/data/myawesomecluster/schema_one-randomchecksum/nb-2274424-big-Data.db:level=0,
>
> /cassandra-data/data/myawesomecluster/schema_one-randomchecksum/nb-2274418-big-Data.db:level=0,
>
> /cassandra-data/data/myawesomecluster/schema_one-randomchecksum/nb-2274421-big-Data.db:level=0,
>
> /cassandra-data/data/myawesomecluster/schema_one-randomchecksum/nb-2274420-big-Data.db:level=0,
>
> /cassandra-data/data/myawesomecluster/schema_one-randomchecksum/nb-2274416-big-Data.db:level=0,
>
> /cassandra-data/data/myawesomecluster/schema_one-randomchecksum/nb-2274417-big-Data.db:level=0,
>
> /cassandra-data/data/myawesomecluster/schema_one-randomchecksum/nb-2274415-big-Data.db:level=0,
> ]
> INFO [NonPeriodicTasks:1] 2023-01-15 13:06:25,254 SSTable.java:111 -
> Deleting sstable:
> /cassandra-data/data/myawesomecluster/schema_one-randomchecksum/nb-2274426-big
> {noformat}
> {noformat}
> $ nodetool compactionhistory | grep '2023-01-15T13:06'
> 75032a40-94d5-11ed-b2c8-7b967b642f39 myawesomecluster schema_one
> 2023-01-15T13:06:43.044 53958242 52853746 {1:478098, 2:11313, 3:1765,
> 4:287, 5:185, 6:88, 7:39, 8:22, 9:13, 10:7, 11:3, 14:1}
> 6a4539e0-94d5-11ed-b2c8-7b967b642f39 myawesomecluster schema_one
> 2023-01-15T13:06:25.022 107577 30110 {1:25, 2:66, 3:124, 4:16, 5:66,
> 6:15, 9:1}
> 6a1b43b0-94d5-11ed-b2c8-7b967b642f39 myawesomecluster schema_one
> 2023-01-15T13:06:24.747 91018 29868 {1:16, 2:127, 3:148, 4:5, 5:7,
> 6:6, 7:3, 8:1, 10:1}
> 6a063510-94d5-11ed-b2c8-7b967b642f39 myawesomecluster schema_one
> 2023-01-15T13:06:24.609 767 366 {2:2}
> 6a0523a0-94d5-11ed-b2c8-7b967b642f39 myawesomecluster schema_one
> 2023-01-15T13:06:24.602 87020 27917 {1:73, 2:38, 3:96, 4:15, 5:67,
> 6:1}
> 69c5a9a0-94d5-11ed-b2c8-7b967b642f39 myawesomecluster schema_one
> 2023-01-15T13:06:24.186 45345 25814 {1:117, 2:150, 3:3}
> 6956bb30-94d5-11ed-b2c8-7b967b642f39 myawesomecluster schema_two
> 2023-01-15T13:06:23.459 8925831 8904158 {1:102662, 2:120}
> 5d886c40-94d5-11ed-b2c8-7b967b642f39 myawesomecluster schema_two
> 2023-01-15T13:06:03.652 8901698 8901269 {1:102606, 2:9}
> 5d02c180-94d5-11ed-b2c8-7b967b642f39 myawesomecluster schema_two
> 2023-01-15T13:06:02.776 8976310 8900384 {1:102844, 2:324}
> 5bf9dd00-94d5-11ed-b2c8-7b967b642f39 system_distributed repair_history
> 2023-01-15T13:06:01.040 4848124 4847506 {4:2}
> 5bc27950-94d5-11ed-b2c8-7b967b642f39 system_distributed parent_repair_history
> 2023-01-15T13:06:00.677 351877 351135 {1:2383, 2:1}
> {noformat}
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