[ https://issues.apache.org/jira/browse/CASSANDRA-6574?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Aleksey Yeschenko updated CASSANDRA-6574: ----------------------------------------- Issue Type: Improvement (was: Bug) > key cache shrinks on restart > ---------------------------- > > Key: CASSANDRA-6574 > URL: https://issues.apache.org/jira/browse/CASSANDRA-6574 > Project: Cassandra > Issue Type: Improvement > Environment: 1.2.12 + patches > Reporter: Chris Burroughs > Attachments: key-cache-entries.png, key-cache-rate.png, key-cache.png > > > During a rolling restart the key number of entries the number of entries in > the key cache is shrinking. That is far fewer entries are loaded than are > saved. This has obvious bad consequences for post restart performance. > {noformat} > key_cache_size_in_mb: 48 > key_cache_save_period: 900 > # Number of keys from the key cache to save > # Disabled by default, meaning all keys are going to be saved > # key_cache_keys_to_save: 100 > row_cache_size_in_mb: 256 > row_cache_save_period: 300 > row_cache_keys_to_save: 50000 > row_cache_provider: SerializingCacheProvider > saved_caches_directory: /home/cassandra/shared/saved_caches > {noformat} > Same log lines: > {noformat} > INFO [CompactionExecutor:24543] 2014-01-11 11:35:47,783 AutoSavingCache.java > (line 289) Saved KeyCache (398028 items) in 1252 ms > *** RESTART *** > INFO [main] 2014-01-11 11:44:59,608 AutoSavingCache.java (line 140) reading > saved cache /home/cassandra/shared/saved_caches/ks-cf1-KeyCache-b.db > INFO [main] 2014-01-11 11:45:00,509 AutoSavingCache.java (line 140) reading > saved cache /home/cassandra/shared/saved_caches/ks-cf2-RowCache-b.db > INFO [main] 2014-01-11 12:02:48,675 ColumnFamilyStore.java (line 452) > completed loading (1068166 ms; 50000 keys) row cache for ks.cf2 > INFO [main] 2014-01-11 12:02:48,769 CassandraDaemon.java (line 291) > completed pre-loading (67760 keys) key cache. > INFO [main] 2014-01-11 12:02:48,769 CassandraDaemon.java (line 294) > completed pre-loading (50000 keys) row cache. > INFO [CompactionExecutor:1] 2014-01-11 12:02:49,133 AutoSavingCache.java > (line 289) Saved RowCache (50000 items) in 266 ms > INFO [CompactionExecutor:2] 2014-01-11 12:02:49,575 AutoSavingCache.java > (line 289) Saved KeyCache (67760 items) in 707 ms > {noformat} -- This message was sent by Atlassian JIRA (v6.3.4#6332)