= sstableexpiredblockers

During compaction, entire sstables can be dropped if they contain only
expired tombstones, and if it is guaranteed that the data is not newer
than the data in other sstables. An expired sstable can be blocked from
getting dropped if its newest timestamp is newer than the oldest data in
another sstable.

This tool is used to list all sstables that are blocking other sstables
from getting dropped (by having older data than the newest tombstone in
an expired sstable) so a user can figure out why certain sstables are
still on disk.

ref: https://issues.apache.org/jira/browse/CASSANDRA-10015

Cassandra must be stopped before this tool is executed, or unexpected
results will occur. Note: the script does not verify that Cassandra is
stopped.

== Usage

sstableexpiredblockers <keyspace> <table>

== Output blocked sstables

If the sstables exist for the table, but no tables have older data than
the newest tombstone in an expired sstable, the script will return
nothing.

Otherwise, the script will return [.title-ref]#<sstable> blocks <#>
expired sstables from getting dropped# followed by a list of the blocked
sstables.

Example:

....
sstableexpiredblockers keyspace1 standard1

[BigTableReader(path='/var/lib/cassandra/data/keyspace1/standard1-0665ae80b2d711e886c66d2c86545d91/mc-2-big-Data.db') (minTS = 5, maxTS = 5, maxLDT = 2147483647)],  blocks 1 expired sstables from getting dropped: [BigTableReader(path='/var/lib/cassandra/data/keyspace1/standard1-0665ae80b2d711e886c66d2c86545d91/mc-3-big-Data.db') (minTS = 1536349775157606, maxTS = 1536349780311159, maxLDT = 1536349780)],

[BigTableReader(path='/var/lib/cassandra/data/keyspace1/standard1-0665ae80b2d711e886c66d2c86545d91/mc-1-big-Data.db') (minTS = 1, maxTS = 10, maxLDT = 2147483647)],  blocks 1 expired sstables from getting dropped: [BigTableReader(path='/var/lib/cassandra/data/keyspace1/standard1-0665ae80b2d711e886c66d2c86545d91/mc-3-big-Data.db') (minTS = 1536349775157606, maxTS = 1536349780311159, maxLDT = 1536349780)],
....