Pere Balaguer created CASSANDRA-18176:
-----------------------------------------
Summary: Merged SSTable files not reclaimed by OS
Key: CASSANDRA-18176
URL: https://issues.apache.org/jira/browse/CASSANDRA-18176
Project: Cassandra
Issue Type: Bug
Reporter: Pere Balaguer
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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