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From Suhail Doshi <suh...@mixpanel.com>
Subject multiget_slice
Date Thu, 14 Jan 2010 07:49:17 GMT
I've been seeing multiget_slice take an extremely long time:

2010-01-14 07:44:00,513 INFO ------------------ Cassandra, delay:
3.64020800591 -----------------------
2010-01-14 07:44:00,513 INFO method: multiget_slice
2010-01-14 07:44:00,513 INFO {'keys':
[u'property:1558:1f0351b7f85b4aa070548e5fd5e08ddf:fce1eab4411d5df240d93ff334f15385:a93ec971e867b23664d990336ce481e0:7516fd43adaa5e0b8a65a672c39845d2',
u'property:1558:1f0351b7f85b4aa070548e5fd5e08ddf:fce1eab4411d5df240d93ff334f15385:fe33779b0db3213f7e354c8e22ad9939:4df200d45716195e86c09a94a54a0c7a',
u'property:1558:1f0351b7f85b4aa070548e5fd5e08ddf:fce1eab4411d5df240d93ff334f15385:71860c77c6745379b0d44304d66b6a13:e37f0136aa3ffaf149b351f6a4c948e9',
u'property:1558:1f0351b7f85b4aa070548e5fd5e08ddf:fce1eab4411d5df240d93ff334f15385:1240f61999709d41292f759e500ad5be:69691c7bdcc3ce6d5d8a1361f22d04ac',
u'property:1558:1f0351b7f85b4aa070548e5fd5e08ddf:fce1eab4411d5df240d93ff334f15385:a6d5b5c3d715b79b59caf7aed18301ac:b53b3a3d6ab90ce0268229151c9bde11'],
'column_parent': ColumnParent(column_family='DistinctIndex',
super_column=None), 'predicate': SlicePredicate(column_names=None,
slice_range=SliceRange(count=14000, start='date_2009-07-01', reversed=False,
finish='date_2010-01-14'))}

2010-01-14 07:44:00,513 INFO result:

2010-01-14 07:44:00,513 INFO
{'property:1558:1f0351b7f85b4aa070548e5fd5e08ddf:fce1eab4411d5df240d93ff334f15385:fe33779b0db3213f7e354c8e22ad9939:4df200d45716195e86c09a94a54a0c7a':
[ColumnOrSuperColumn(column=Column(timestamp=1263231323,
name='date_2010-01-11', value='1'), super_column=None),
ColumnOrSuperColumn(column=Column(timestamp=1263333256,
name='date_2010-01-12', value='1'), super_column=None),
ColumnOrSuperColumn(column=Column(timestamp=1263418556,
name='date_2010-01-13', value='1'), super_column=None),
ColumnOrSuperColumn(column=Column(timestamp=1263451804,
name='date_2010-01-14', value='1'), super_column=None)],
'property:1558:1f0351b7f85b4aa070548e5fd5e08ddf:fce1eab4411d5df240d93ff334f15385:71860c77c6745379b0d44304d66b6a13:e37f0136aa3ffaf149b351f6a4c948e9':
[ColumnOrSuperColumn(column=Column(timestamp=1263231323,
name='date_2010-01-11', value='1'), super_column=None),
ColumnOrSuperColumn(column=Column(timestamp=1263333256,
name='date_2010-01-12', value='1'), super_column=None),
ColumnOrSuperColumn(column=Column(timestamp=1263418556,
name='date_2010-01-13', value='1'), super_column=None),
ColumnOrSuperColumn(column=Column(timestamp=1263451804,
name='date_2010-01-14', value='1'), super_column=None)],
'property:1558:1f0351b7f85b4aa070548e5fd5e08ddf:fce1eab4411d5df240d93ff334f15385:a6d5b5c3d715b79b59caf7aed18301ac:b53b3a3d6ab90ce0268229151c9bde11':
[ColumnOrSuperColumn(column=Column(timestamp=1263333256,
name='date_2010-01-12', value='1'), super_column=None),
ColumnOrSuperColumn(column=Column(timestamp=1263418556,
name='date_2010-01-13', value='1'), super_column=None),
ColumnOrSuperColumn(column=Column(timestamp=1263451804,
name='date_2010-01-14', value='1'), super_column=None)],
'property:1558:1f0351b7f85b4aa070548e5fd5e08ddf:fce1eab4411d5df240d93ff334f15385:a93ec971e867b23664d990336ce481e0:7516fd43adaa5e0b8a65a672c39845d2':
[ColumnOrSuperColumn(column=Column(timestamp=1263231323,
name='date_2010-01-11', value='1'), super_column=None),
ColumnOrSuperColumn(column=Column(timestamp=1263333256,
name='date_2010-01-12', value='1'), super_column=None),
ColumnOrSuperColumn(column=Column(timestamp=1263418556,
name='date_2010-01-13', value='1'), super_column=None),
ColumnOrSuperColumn(column=Column(timestamp=1263451804,
name='date_2010-01-14', value='1'), super_column=None)],
'property:1558:1f0351b7f85b4aa070548e5fd5e08ddf:fce1eab4411d5df240d93ff334f15385:1240f61999709d41292f759e500ad5be:69691c7bdcc3ce6d5d8a1361f22d04ac':
[ColumnOrSuperColumn(column=Column(timestamp=1263231323,
name='date_2010-01-11', value='1'), super_column=None),
ColumnOrSuperColumn(column=Column(timestamp=1263333256,
name='date_2010-01-12', value='1'), super_column=None),
ColumnOrSuperColumn(column=Column(timestamp=1263418556,
name='date_2010-01-13', value='1'), super_column=None),
ColumnOrSuperColumn(column=Column(timestamp=1263451804,
name='date_2010-01-14', value='1'), super_column=None)]}


The delay is the time at which it took to run the query and then return a
result. The box has 4GB of RAM and the *JVM_MAX_MEM (-Xmx) is set at 3G*. If
you're curious how I am running it:

/usr/bin/jsvc -home /usr/lib/jvm/java-6-openjdk/jre -pidfile
/var/run/cassandra.pid -errfile &1 -outfile /var/log/cassandra/output.log
-cp
/usr/share/cassandra/antlr-3.1.3.jar:/usr/share/cassandra/apache-cassandra-incubating-0.5.0-rc1.jar:/usr/share/cassandra/apache-cassandra-incubating.jar:/usr/share/cassandra/clhm-production.jar:/usr/share/cassandra/commons-cli-1.1.jar:/usr/share/cassandra/commons-collections-3.2.1.jar:/usr/share/cassandra/commons-lang-2.4.jar:/usr/share/cassandra/google-collect-1.0-rc1.jar:/usr/share/cassandra/high-scale-lib.jar:/usr/share/cassandra/jline-0.9.94.jar:/usr/share/cassandra/json_simple-1.1.jar:/usr/share/cassandra/junit-4.6.jar:/usr/share/cassandra/libthrift-r894924.jar:/usr/share/cassandra/log4j-1.2.15.jar:/usr/share/cassandra/slf4j-api-1.5.8.jar:/usr/share/cassandra/slf4j-log4j12-1.5.8.jar:/etc/cassandra:/usr/share/java/commons-daemon.jar
-Xmx3G -Xms128M -Dcassandra -Dstorage-config=/etc/cassandra
-Dcom.sun.management.jmxremote.port=8080
-Dcom.sun.management.jmxremote.ssl=false
-Dcom.sun.management.jmxremote.authenticate=false
org.apache.cassandra.service.CassandraDaemon

I am running version* 0.5.0rc2*.

Does anyone know what the bottleneck might be and how reads using
multiget_slice can be sped up? When I look at the memory used, it's only
about 1700 MB used. The box is not excessively swapping, running
iostat--everything seemed pretty okay.

Suhail

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