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From "Brandon Williams (JIRA)" <j...@apache.org>
Subject [jira] [Created] (CASSANDRA-3203) Odd flush behavior
Date Tue, 13 Sep 2011 21:49:10 GMT
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


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.

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