| = 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)], |
| .... |
