[ https://issues.apache.org/jira/browse/CASSANDRA-3203?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Jonathan Ellis updated CASSANDRA-3203: -------------------------------------- Attachment: 3203-prelim.txt patch that fixes two problems: - removes double-counting of ByteBuffer overhead in jamm 0.2.4 - removes 25% fudge factor that is no longer useful with Slab allocation That still leaves us with at least one other problem, though. > Odd flush behavior > ------------------ > > Key: CASSANDRA-3203 > URL: https://issues.apache.org/jira/browse/CASSANDRA-3203 > Project: Cassandra > Issue Type: Bug > Components: Core > Affects Versions: 1.0.0 > Reporter: Brandon Williams > Priority: Critical > Fix For: 1.0.0 > > Attachments: 3203-prelim.txt > > > Given the same workload against 0.8, trunk is creating more than twice the > amount of sstables. Even though a uniform stress workload is being > generated, flush size degrades quickly: > {noformat} > INFO [NonPeriodicTasks:1] 2011-09-09 18:24:22,878 ColumnFamilyStore.java > (line 658) Enqueuing flush of Memtable-Standard1@2058235391(7741 > 035/110172631 serialized/live bytes, 151785 ops) > INFO [NonPeriodicTasks:1] 2011-09-09 18:24:24,888 ColumnFamilyStore.java > (line 658) Enqueuing flush of Memtable-Standard1@1520390052(3887 > 220/72403158 serialized/live bytes, 76220 ops) > INFO [NonPeriodicTasks:1] 2011-09-09 18:24:26,890 ColumnFamilyStore.java > (line 658) Enqueuing flush of Memtable-Standard1@1868496516(4097 > 085/76255481 serialized/live bytes, 80335 ops) > INFO [NonPeriodicTasks:1] 2011-09-09 18:24:28,893 ColumnFamilyStore.java > (line 658) Enqueuing flush of Memtable-Standard1@498232521(43513 > 20/80922269 serialized/live bytes, 85320 ops) > INFO [NonPeriodicTasks:1] 2011-09-09 18:24:29,895 ColumnFamilyStore.java > (line 658) Enqueuing flush of Memtable-Standard1@1592308290(2310 > 810/44514839 serialized/live bytes, 45310 ops) > INFO [NonPeriodicTasks:1] 2011-09-09 18:24:30,897 ColumnFamilyStore.java > (line 658) Enqueuing flush of Memtable-Standard1@775439677(22684 > 80/64984390 serialized/live bytes, 44480 ops) > INFO [NonPeriodicTasks:1] 2011-09-09 18:24:31,899 ColumnFamilyStore.java > (line 658) Enqueuing flush of Memtable-Standard1@928217914(26741 > 85/76231422 serialized/live bytes, 52435 ops) > INFO [NonPeriodicTasks:1] 2011-09-09 18:24:32,901 ColumnFamilyStore.java > (line 658) Enqueuing flush of Memtable-Standard1@158103119(27511 > 95/77317732 serialized/live bytes, 53945 ops) > INFO [NonPeriodicTasks:1] 2011-09-09 18:24:33,903 ColumnFamilyStore.java > (line 658) Enqueuing flush of Memtable-Standard1@2035169258(3132 > 420/88934701 serialized/live bytes, 61420 ops) > INFO [NonPeriodicTasks:1] 2011-09-09 18:24:34,905 ColumnFamilyStore.java > (line 658) Enqueuing flush of Memtable-Standard1@1097314626(2979 > 675/83651699 serialized/live bytes, 58425 ops) > {noformat} > The serialized to live size ratio appears completely out of whack. -- This message is automatically generated by JIRA. For more information on JIRA, see: http://www.atlassian.com/software/jira