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From Jonathan Ellis <jbel...@gmail.com>
Subject Re: 0.7.0beta2 with 128G memory = bizarre tiny files. help?
Date Wed, 27 Oct 2010 18:36:20 GMT
Not in b2.
On Oct 27, 2010 11:08 AM, "Chip Salzenberg" <chip@pobox.com> wrote:
> Are these values available in JMX? If so, which ones are they? I'd
> prefer not to possibly destroy the evidence by upgrading.
>
> On 10/27/2010 6:50 AM, Jonathan Ellis wrote:
>> Connect with the cli and run "show keyspaces." It sounds like
>> Cassandra somehow picked ludicrously low memtable thresholds. There
>> will be a line like
>>
>> Memtable thresholds: 0.2953125/63/60
>>
>> This may not be in the b2 cli, in which case you will need to upgrade
>> to the nightly from
>>
http://hudson.zones.apache.org/hudson/job/Cassandra/lastSuccessfulBuild/artifact/cassandra/build/
>> (essentially the same as rc1 being voted on).
>>
>> On Wed, Oct 27, 2010 at 4:17 AM, Chip Salzenberg <chip@pobox.com> wrote:
>>> I recently tested 0.7.0beta2 with good results on a reasonably powerful
>>> machine: 8 Xeon cores (16 if you count hyperthreads), 64G memory, and
>>> some nice HP RAID. So far so good. But when I took the same config and
>>> moved it to a basically identical box with 128G of memory, cassandra
>>> started responding to writes by creating a plethora of teeny tiny
>>> sstables -- something it had not done before. For example:
>>>
>>> INFO [FLUSH-WRITER-POOL:1] 2010-10-27 01:53:27,881 Memtable.java (line
>>> 150) Writing Memtable-Standard1@950886315(651 bytes, 18 operations)
>>> INFO [MUTATION_STAGE:8] 2010-10-27 01:53:27,882 ColumnFamilyStore.java
>>> (line 459) switching in a fresh Memtable for Standard1 at
>>>
CommitLogContext(file='/var/lib/cassandra/commitlog/_chip/CommitLog-1288169534132.log',
>>> position=27598)
>>> INFO [MUTATION_STAGE:8] 2010-10-27 01:53:27,883 ColumnFamilyStore.java
>>> (line 771) Enqueuing flush of Memtable-Standard1@1383310803(384 bytes,
>>> 10 operations)
>>> INFO [FLUSH-WRITER-POOL:1] 2010-10-27 01:53:27,902 Memtable.java (line
>>> 157) Completed flushing
>>> /var/lib/cassandra/data/_chip/Keyspace1/Standard1-e-7-Data.db
>>> INFO [FLUSH-WRITER-POOL:1] 2010-10-27 01:53:27,903 Memtable.java (line
>>> 150) Writing Memtable-Standard1@996627145(360 bytes, 10 operations)
>>> INFO [MUTATION_STAGE:3] 2010-10-27 01:53:27,927 ColumnFamilyStore.java
>>> (line 459) switching in a fresh Memtable for Standard1 at
>>>
CommitLogContext(file='/var/lib/cassandra/commitlog/_chip/CommitLog-1288169534132.log',
>>> position=31446)
>>> INFO [MUTATION_STAGE:3] 2010-10-27 01:53:27,927 ColumnFamilyStore.java
>>> (line 771) Enqueuing flush of Memtable-Standard1@1909350010(957 bytes,
>>> 26 operations)
>>> INFO [FLUSH-WRITER-POOL:1] 2010-10-27 01:53:27,932 Memtable.java (line
>>> 157) Completed flushing
>>> /var/lib/cassandra/data/_chip/Keyspace1/Standard1-e-8-Data.db
>>> INFO [FLUSH-WRITER-POOL:1] 2010-10-27 01:53:27,933 Memtable.java (line
>>> 150) Writing Memtable-Standard1@1383310803(384 bytes, 10 operations)
>>> INFO [CompactionExecutor:1] 2010-10-27 01:53:27,934
>>> CompactionManager.java (line 233) Compacting
>>>
[org.apache.cassandra.io.sstable.SSTableReader(path='/var/lib/cassandra/data/_chip/Keyspace1/Standard1-e-5-Data.db'),org.apache.cassandra.io.sstable.SSTableReader(path='/var/lib/cassandra/data/_chip/Keyspace1/Standard1-e-6-Data.db'),org.apache.cassandra.io.sstable.SSTableReader(path='/var/lib/cassandra/data/_chip/Keyspace1/Standard1-e-7-Data.db'),org.apache.cassandra.io.sstable.SSTableReader(path='/var/lib/cassandra/data/_chip/Keyspace1/Standard1-e-8-Data.db')]
>>> INFO [MUTATION_STAGE:17] 2010-10-27 01:53:27,936 ColumnFamilyStore.java
>>> (line 459) switching in a fresh Memtable for Standard1 at
>>>
CommitLogContext(file='/var/lib/cassandra/commitlog/_chip/CommitLog-1288169534132.log',
>>> position=33074)
>>> INFO [MUTATION_STAGE:17] 2010-10-27 01:53:27,936 ColumnFamilyStore.java
>>> (line 771) Enqueuing flush of Memtable-Standard1@595066677(396 bytes, 11
>>> operations)
>>> INFO [FLUSH-WRITER-POOL:1] 2010-10-27 01:53:28,037 Memtable.java (line
>>> 157) Completed flushing
>>> /var/lib/cassandra/data/_chip/Keyspace1/Standard1-e-9-Data.db
>>>
>>> I tried lowering the available memory reported by bin/cassandra:
>>>
>>> system_memory_in_mb=`free -m | awk '/Mem:/ {print $2}'`
>>> [ "$system_memory_in_mb" -gt 65536 ] &&
>>> system_memory_in_mb=65536 #<<<< new
>>>
>>> Didn't help. I also tried maually setting the max memtable sizes:
>>>
>>> binary_memtable_throughput_in_mb: 512
>>> memtable_throughput_in_mb: 4096
>>>
>>> Didn't help.
>>>
>>> Help?
>>>
>>
>>

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