For static column family what is the advantage in pre-defining column metadata ?
I can see ease of understanding type of values that the CF contains
and that clients will reject incompatible insertion.
But are there any major advantages in terms of performance or
something else that makes it
Hi,
I am new to java and trying to get the Astyanax client running for Cassandra.
Downloaded astyanax from https://github.com/Netflix/astyanax. How do I
compile the source code from here it in a very simple fashion from
linux command line ?
Thanks.
Hello,
I am tyring to retrieve a list of Column Names (that are defined as
Integer) from a CF with RowKey as Integer as well. (I don't care for
the column values that are just nulls)
Following is snippet of my Astyanax code. I am getting 0 columns but I
know the key that I am querying contains a
Is it possible in some way to specify what specific nodes I want to
include (or exclude) from the Consistency Level fulfillment ?
Example, I have a cluster of 4 nodes (n1,n2,n3 and n4) and set N=4. I
want to set W=3 and want to ensure that it is n1,n2 and n3 only that
are used to satisfy w=3 (i.e.
Snapshot runs on a local node. How do I ensure I have a 'point in
time' snapshot of the full cluster ? Do I have to stop the writes on
the full cluster and then snapshot all the nodes individually ?
Thanks.
Is there a way to favor a node to always participate (or never
participate) towards fulfillment of read consistency as well as write
consistency ?
Thanks
AJ
hits
see https://github.com/apache/cassandra/blob/cassandra-0.8.0/conf/cassandra.yaml#L308
Cheers
-
Aaron Morton
Freelance Cassandra Developer
@aaronmorton
http://www.thelastpickle.com
On 16 Jun 2011, at 05:58, A J wrote:
Is there a way to favor a node to always
Is there an enhancement on the roadmap to stagger the auto compactions
on different nodes, to avoid more than one node compacting at any
given time (or as few nodes as possible to compact at any given time).
If not, any workarounds ?
Thanks.
During writes, the timestamp field in the column is the system-time of
that node (correct me if that is not the case and the system-time of
the co-ordinator is what gets applied to all the replicas).
During reads, the latest write wins.
What if there is a clock skew ? It could lead to a stale
://ria101.wordpress.com/2011/02/08/cassandra-the-importance-of-system-clocks-avoiding-oom-and-how-to-escape-oom-meltdown/
Hope this helps
Dominic
On 27 June 2011 23:03, A J s5a...@gmail.com wrote:
During writes, the timestamp field in the column is the system-time of
that node (correct me
Are there any options to encrypt the column families when they are
stored in the database. Say in a given keyspace some CF has sensitive
info and I don't want a 'select *' of that CF to layout the data in
plain text.
Thanks.
From what I read, Cassandra allows a single column value to be up-to
2GB but would chunk the data if greater than 64MB.
Is the chunking transparent to the application or does the app need to
know if/how/when the chunking happened for a specific column value
that happened to be 64MB.
Thank you.
Cassandra uses accrual failure detector to interpret the gossips.
Is it somehow possible to extract these (gossip values and results of
the failure detector) in an external system ?
Thanks
I am little confused of the reason why nodetool repair has to run
within GCGraceSeconds.
The documentation at:
http://wiki.apache.org/cassandra/Operations#Frequency_of_nodetool_repair
is not very clear to me.
How can a delete be 'unforgotten' if I don't run nodetool repair? (I
understand that if
Thanks all !
In other words, I think it is safe to say that a node as a whole can
be made consistent only on 'nodetool repair'.
Has there been enough interest in providing anti-entropy without
compaction as a separate operation (nodetool repair does both) ?
On Thu, Jun 30, 2011 at 5:27 PM,
cqlsh CREATE KEYSPACE twissandra with
... strategy_class =
... 'org.apache.cassandra.locator.NetworkTopologyStrategy'
... and strategy_options=[{DC1:1, DC2:1}];
Bad Request: line 4:37 no viable alternative at character ']'
What is wrong with the above syntax ?
Thanks.
Thanks. That worked.
On Tue, Jul 5, 2011 at 11:35 AM, Jonathan Ellis jbel...@gmail.com wrote:
replace the s_o line with
and strategy_options:DC1=1 and strategy_options:DC2=2
On Tue, Jul 5, 2011 at 10:09 AM, A J s5a...@gmail.com wrote:
cqlsh CREATE KEYSPACE twissandra
Hello,
Let me explain what I am trying to do:
I am prototyping 2 Data centers (DC1 and DC2) with two nodes each. Say
DC1_n1 and DC1_n2 nodes in DC1 and DC2_n1 and DC2_n2 in DC2.
With PropertyFileSnitch and NetworkTopologyStrategy and
'strategy_options of DC1=1 and DC2=1', I am able to ensure that
Perfect ! Thanks.
On Tue, Jul 5, 2011 at 1:51 PM, Eric tamme eta...@gmail.com wrote:
AJ,
You can use offset mirror tokens to achieve this. Pick your initial
tokens for DC1N1 and DC1N2 as if they were the only nodes in your
cluster. Now increment each by 1 and use them as the tokens for
Hello,
Where can I find details of nodetool move. Most places just mention
that 'move the target node to a given Token. Moving is essentially a
convenience over decommission + bootstrap.'
Stuff like, when do I need to do and on what nodes? What is the value
of 'new token' to be provided ? What
I wish to use the order preserving byte-ordered partitioner. How do I
figure the initial token values based on the text key value.
Say I wish to put all keys starting from a to d on N1. e to m on N2
and n to z on N3. What would be the initial_token values on each of
the 3 nodes to accomplish this
https://www.packtpub.com/cassandra-apache-high-performance-cookbook/book
Is there a way to find what all nodes was a write applied to ? It
could be a successful write (i.e. w was met) or unsuccessful write
(i.e. less than w nodes were met). In either case, I am interested in
finding:
Number of nodes written to (before timeout or on success)
Name of nodes written to
Does a write lock:
1. Just the columns in question for the specific row in question ?
2. The full row in question ?
3. The full CF ?
I doubt read does any locks.
Thanks.
Does a 'select * from cf' with no filter still use the primary
index on the key or do a 'full table scan' ?
Thanks.
Instead of doing nodetool repair, is it not a cheaper operation to
keep tab of failed writes (be it deletes or inserts or updates) and
read these failed writes at a set frequency in some batch job ? By
reading them, RR would get triggered and they would get to a
consistent state.
Because these
Never mind. I see the issue with this. I will be able to catch the
writes as failed only if I set CL=ALL. For other CLs, I may not know
that it failed on some node.
On Mon, Jul 11, 2011 at 2:33 PM, A J s5a...@gmail.com wrote:
Instead of doing nodetool repair, is it not a cheaper operation
Hello,
Have the following questions related to nodetool repair:
1. I know that Nodetool Repair Interval has to be less than
GCGraceSeconds. How do I come up with an exact value of GCGraceSeconds
and 'Nodetool Repair Interval'. What factors would want me to change
the default of 10 days of
with neighboring
nodes.
So is this text from the book misleading ?
On Fri, Jul 8, 2011 at 10:36 AM, Jonathan Ellis jbel...@gmail.com wrote:
that's an internal term meaning background i/o, not sstable merging per se.
On Fri, Jul 8, 2011 at 9:24 AM, A J s5a...@gmail.com wrote:
I think node repair involves
Just confirming. Thanks for the clarification.
On Tue, Jul 12, 2011 at 10:53 AM, Peter Schuller
peter.schul...@infidyne.com wrote:
From Cassandra the definitive guide - Basic Maintenance - Repair
Running nodetool repair causes Cassandra to execute a major compaction.
During a major
Hi,
For a single node of cassandra(1.0 version) having 15G of data+index,
48GB RAM, 8GB heap and about 2.6G memtable threshold, I am getting OOM
when I have 1000 concurrent inserts happening at the same time.
I have kept concurrent_writes: 128 in cassandra.yaml as there are a
total of 16 cores
Hello
Say I have 4 nodes: A, B, C and D and wish to have consistency level
for writes defined in such as way that writes meet the following
consistency level:
(A or B) AND C AND !D,
i.e. either of A or B will suffice and C to be included into
consistency level as well. But the write should not
To clarify, I wish to keep N=4 and W=2 in the following scenario.
Thanks.
On Sun, Nov 13, 2011 at 11:20 PM, A J s5a...@gmail.com wrote:
Hello
Say I have 4 nodes: A, B, C and D and wish to have consistency level
for writes defined in such as way that writes meet the following
consistency
Hello
VoltDB has an export feature to stream the data out of the database.
http://voltdb.com/company/blog/voltdb-export-connecting-voltdb-other-systems
This is different from Cassandra's export feature
(http://wiki.apache.org/cassandra/Operations#Import_.2BAC8_export)
which is more of a different
The issue with that is that I wish to have EACH_QUORUM in our other 2
datacenters but not in the third DC.
Could not figure a way to accomplish that so exploring have a
near-realtime backup copy in the third DC via some streaming process.
On Tue, Nov 15, 2011 at 12:12 PM, Robert Jackson
Hello,
Is 'garbage collecting tombstones ' a different operation than the JVM GC.
Garbage collecting tombstones is controlled by gc_grace_seconds which
by default is set to 10 days. But the traditional GC seems to happen
much more frequently (when observed through jconsole) ?
How can I force the
If I update a keyspace to increase the replication factor; what
happens to existing data for that keyspace ? Does the existing data
get automatically increase its replication ? Or only on a RR or node
repair does the existing data increase its replication factor ?
Thanks.
What is the syntax for each_quorum in pycassa ?
Thanks.
What is the syntax of setStrategy_options in thrift.
The following fails:
Util.java:22:
setStrategy_options(java.util.Mapjava.lang.String,java.lang.String)
in org.apache.cassandra.thrift.KsDef cannot be applied to
(java.lang.String)
newKs.setStrategy_options({replication_factor:2});
The following syntax :
import org.apache.cassandra.thrift.*;
.
.
ColumnOrSuperColumn col = client.get(count_key.getBytes(UTF-8),
cp, ConsistencyLevel.QUORUM);
is giving the error:
get(java.nio.ByteBuffer,org.apache.cassandra.thrift.ColumnPath,org.apache.cassandra.thrift.ConsistencyLevel)
is the option
and the value is the option value.
Cheers
-
Aaron Morton
Freelance Developer
@aaronmorton
http://www.thelastpickle.com
On 20/12/2011, at 12:02 PM, A J wrote:
What is the syntax of setStrategy_options in thrift.
The following fails:
Util.java:22
toByteBuffer(String value) throws
UnsupportedEncodingException{return
ByteBuffer.wrap(value.getBytes(UTF-8));}
see http://wiki.apache.org/cassandra/ThriftExamples
*- Original Message -*
*From:* A J s5a...@gmail.com
*Sent:* Tue, December 20, 2011 15:52
*Subject
-*
*From:* A J s5a...@gmail.com
*Sent:* Tue, December 20, 2011 16:03
*Subject:* Re: setStrategy_options syntax in thrift
I am new to java. Can you specify the exact syntax for replication_factor=2 ?
Thanks.
On Tue, Dec 20, 2011 at 1:50 PM, aaron morton aa...@thelastpickle.com
wrote: It looks
If I change endpoint_snitch from SimpleSnitch to PropertyFileSnitch,
does it require restart of cassandra on that node ?
Thanks.
Hello,
I am trying to use internode encryption in Cassandra (1.0.6) for the first time.
1. Followed the steps 1 to 5 at
http://download.oracle.com/javase/6/docs/technotes/guides/security/jsse/JSSERefGuide.html#CreateKeystore
Q. In cassandra.yaml , what value goes for keystore ? I exported the
Is there a command in cqlsh or cassandra CLI that can display the
various values of the configuration parameters at use.
I am particularly interested in finding the value of ' commitlog_sync'
that the current session is using ?
Thanks.
AJ
-
Aaron Morton
Freelance Developer
@aaronmorton
http://www.thelastpickle.com
On 25/01/2012, at 10:10 AM, A J wrote:
Is there a command in cqlsh or cassandra CLI that can display the
various values of the configuration parameters at use.
I am particularly interested
Hello, when you set 'commitlog_sync: batch' on all the nodes in a
multi-DC cluster and call writes with CL=ALL, does the operation wait
till the write is flushed to all the disks on all the nodes ?
Thanks.
Hello,
What is the best way to log write operations (insert,remove, counter
add, batch operations) in Cassandra. I need to store the operations
(with values being passed) in some fashion or the other for audit
purposes (and possibly to undo some operation after inspection).
Thanks.
What is the best way to create millions of test data in Cassandra ?
I would like to have some script where I first insert say 100 rows in
a CF. Then reinsert the same data on 'server side' with new unique
key. That will make it 200 rows. Then continue the exercise a few
times till I get lot of
I know batch operations are not atomic but does the success of a write
imply all writes preceeding it in the batch were successful ?
For example, using cql:
BEGIN BATCH USING CONSISTENCY QUORUM AND TTL 864
INSERT INTO users (KEY, password, name) VALUES ('user2',
'ch@ngem3b', 'second user')
at 4:15 PM, Tyler Hobbs ty...@datastax.com wrote:
On Wed, Mar 14, 2012 at 11:50 AM, A J s5a...@gmail.com wrote:
Are you saying the way 'batch mutate' is coded, the order of writes in
the batch does not mean anything ? You can ask the batch to do A,B,C
and then D in sequence; but sometimes
If I define my rowkeys to be Integer
(key_validation_class=IntegerType) , how can I order the rows
numerically ?
ByteOrderedPartitioner orders lexically and retrieval using get_range
does not seem to make sense in order.
If I were to change rowkey to be UTF8 (key_validation_class=UTF8Type),
BOP
How many Column Families are one too many for Cassandra ?
I created a db with 5000 CFs (I can go into the reasons later) but the
latency seems to be very erratic now. Not sure if it is because of the
number of CFs.
Thanks.
+state:results
If you still got questions after reading this thread or some others about
the same topic, do not hesitate asking again,
Alain
2012/3/19 A J s5a...@gmail.com
How many Column Families are one too many for Cassandra ?
I created a db with 5000 CFs (I can go into the reasons
column family.
20.03.12 16:05, A J написав(ла):
ok, the last thread says that 1.0+ onwards, thousands of CFs should
not be a problem.
But I am finding that all the allocated heap memory is getting consumed.
I started with 8GB heap and then on reading
http://www.datastax.com/dev/blog/whats
histogram
first, heap dump second.
Best regards, Vitalii Tymchyshyn
20.03.12 18:12, A J написав(ла):
I have both row cache and column cache disabled for all my CFs.
cfstats says Bloom Filter Space Used: 1760 per CF. Assuming it is in
bytes, it is total of about 9MB of bloom filter size for 5K
Yes, that is good enough for now. Thanks.
On Fri, Mar 16, 2012 at 6:49 PM, Watanabe Maki watanabe.m...@gmail.com wrote:
How about to fill zeros before smaller digits?
Ex. 0001, 0002, etc
maki
On 2012/03/17, at 6:29, A J s5a...@gmail.com wrote:
If I define my rowkeys to be Integer
Never mind.
Double quotes within the single quotes worked:
select * from solr where solr_query='body:sixty eight million nine
hundred forty three thousand four hundred twenty four';
On Thu, Apr 12, 2012 at 11:42 AM, A J s5a...@gmail.com wrote:
What is the syntax for a string match in CQL
Are row key hashed before being physically stored in Cassandra ? If
so, what hash function is used to ensure collision is minimal.
Thanks.
Is it possible to use a custom Partitioner type (other than RP or BOP) ?
Say if my rowkeys are all Integers and I want all even keys to go to
node1 and odd keys to node2, is it feasible ? How would I go about ?
Thanks.
Hi
If I have a WHERE clause in CQL with several 'AND' and each column is
indexed, which index(es) is(are) used ?
Just the first field in the where clause or all the indexes involved
in the clause ?
Also is index used only with an equality operator or also with greater
than /less than comparator
I am running 1.1.3
Nodetool on the database node (just a single node db) is giving the error:
Failed to connect to 'localhost:7199': Connection refused
Any idea what could be causing this ?
Thanks.
on that port?
So database node did not start and bind to that port and you would see
exception in the logs of that database nodeŠ.just a guess.
Dean
On 8/20/12 4:10 PM, A J s5a...@gmail.com wrote:
I am running 1.1.3
Nodetool on the database node (just a single node db) is giving the error
Hello
Is it possible to store binary objects (images, pdfs, videos etc) in
Cassandra. The size of my images are less than 100MB.
If so, how do I try inserting and retrieving a few files from cassandra ?
Would prefer if someone can give examples using pycassa.
Thanks !
AJ
Say I set write consistency level to ALL and all but one node are down. What
happens to writes ? Does it rollback from the live node before returning
failure to client ?
Thanks.
If I update a column (i.e. change the value contents for a given name in a
given key), is the physical disk operation equivalent to delete followed by
insert.
Or is it just insert somehow making the last value marked as stale ?
In the definite guide, it says the following about SSTable:
*All
determines the correct value to send to the client based on
the responses it receives and then sends it.
On Tue, Feb 15, 2011 at 3:55 PM, A J s5a...@gmail.com wrote:
Thanks.
1. That is somewhat disappointing. Wish the redundancy of write on the
coordinator node could have been avoided somehow
Yes, I read the same and it sounded weird.
*Note that with RackAwareStrategy, succeeding nodes along the ring should
alternate data centers to avoid hot spots. For instance, if you have nodes
A, B, C, and D in increasing Token order, and instead of alternating you
place A and B in DC1, and C and
...@gmail.com wrote:
A J s5alye at gmail.com writes:
Makes sense ! Thanks.
Just a quick follow-up:
Now I understand the write is not made to coordinator (unless it is part
of
the replica for that key). But does the write column traffic 'flow' through
the
coordinator node. For a 2G column
By any chance are there companies that provide support for Cassandra ?
Consult on setup and configuration and annual support packages ?
Where can I get good detailed explanation of the various replication
options (Simple, Old Network and Network) along with snitches. I did
read the definitive guide but not really satisfied.
Is there a good post somewhere explaining this ?
I will have 4 datacenters (assume) and 3 nodes in each
Thanks ! Finally. Did several retries since morning.
On Thu, Feb 17, 2011 at 1:39 PM, Jonathan Ellis jbel...@gmail.com wrote:
Maybe https://issues.apache.org/jira/browse/INFRA-3356?
On Thu, Feb 17, 2011 at 12:37 PM, A J s5a...@gmail.com wrote:
--
Jonathan Ellis
Project Chair, Apache
Hi,
Are there any blogs/writeups anyone is aware of that talks of using
primary replica as coordinator node (rather than a random coordinator
node) in production scenarios ?
Thank you.
On Wed, Feb 16, 2011 at 10:53 AM, A J s5a...@gmail.com wrote:
Thanks for the confirmation. Interesting
?
Thanks.
On Fri, Feb 18, 2011 at 10:23 AM, A J s5a...@gmail.com wrote:
Questions about R and N (and W):
1. If I set R to Quorum and cassandra identifies a need for read
repair before returning, would the read repair happen on R nodes (I
mean subset of R that needs repair) or N nodes before
If I wish to find name of all the keys in all the column families
along with other related metadata (such as last updated, size of
column value field), is there an additional solution that caches this
metadata OR do I have to always perform range queries and get the
information ?
I am not
W always stands for number of sync writes. N-W is the number of async writes.
Note, N decides number of replicas. W only decides out of those N
replicas, how many should be written synchronously before returning
success of write to client. All writes always happen to a total of N
nodes (W right
Hello,
Have there been Cassandra implementations in non-latin languages. In
particular: Mandarin (China) ,Devanagari (India), Korean (Korea)
I am interested in finding if there are storage, sorting or other
types of issues one should be aware of in these languages.
Thanks.
but could be broken in case of a failed write
You can think of a scenario where R + W N still leads to
inconsistency even for successful writes. Say you keep W=1 and R=N .
Lets say the one node where a write happened with success goes down
before it made to the other N-1 nodes. Lets say it goes
in error could have gone through partially
Again, this is not an absolutely unfamiliar territory and can be dealt with.
-JA
On Thu, Feb 24, 2011 at 1:16 PM, A J s5a...@gmail.com wrote:
but could be broken in case of a failed write
You can think of a scenario where R + W N still leads
While we are at it, there's more to consider than just CAP in distributed :)
http://voltdb.com/blog/clarifications-cap-theorem-and-data-related-errors
On Thu, Feb 24, 2011 at 3:31 PM, Edward Capriolo edlinuxg...@gmail.com wrote:
On Thu, Feb 24, 2011 at 3:03 PM, A J s5a...@gmail.com wrote:
yes
PM, A J s5a...@gmail.com wrote:
While we are at it, there's more to consider than just CAP in distributed :)
http://voltdb.com/blog/clarifications-cap-theorem-and-data-related-errors
On Thu, Feb 24, 2011 at 3:31 PM, Edward Capriolo edlinuxg...@gmail.com
wrote:
On Thu, Feb 24, 2011 at 3:03 PM
-tolerance/
Then, Jeff Darcy's response: http://pl.atyp.us/wordpress/?p=3110
On Thu, Feb 24, 2011 at 2:56 PM, A J s5a...@gmail.com wrote:
While we are at it, there's more to consider than just CAP in distributed :)
http://voltdb.com/blog/clarifications-cap-theorem-and-data-related-errors
On Thu
I read in some cassandra notes that each node should be allocated
twice the storage capacity you wish it to contain. I think the reason
was during compaction another copy of SSTables have to be made before
the original ones are discarded.
Can someone confirm if that is actually true ? During
OK. Is it also driven by type of compaction ? Does a minor compaction
require less working space than major compaction ?
On Fri, Feb 25, 2011 at 12:40 PM, Robert Coli rc...@digg.com wrote:
On Fri, Feb 25, 2011 at 9:22 AM, A J s5a...@gmail.com wrote:
I read in some cassandra notes that each node
Thanks. What happens when my compaction fails for space reasons ?
Is no compaction possible till I add more space ?
I would assume writes are not impacted though the latency of reads
would increase, right ?
Also though writes are not seek-intensive, compactions are seek-intensive, no ?
On Fri,
Another related question:
Can the minor compactions across nodes be staggered so that I can
control how many nodes are compacting at any given point ?
On Fri, Feb 25, 2011 at 2:01 PM, A J s5a...@gmail.com wrote:
Thanks. What happens when my compaction fails for space reasons ?
Is no compaction
Hello,
I know it depends on lot of factors but are there any ballpark number
on how long it takes to recreate a node from other nodes (or add a new
node to a ring).
Something like x GBs take y minutes to build ?
Thanks.
Depends on the specs of your large files.
If the files are less than 64MB, there will be no splitting.
Cassandra(actually thrift) has no streaming abilities. But if your
objects are small (in a few MBs) they would fit in memory easily.
I will have lot of binaries less than few MBs in size. I am
What are other options then
Several.
1. Mogilefs. Stores on filesystem but metadata in database (MySQL or
Postgres). Also has redundancy built in. Does not require RAID. No
SPOF. But I think it has too many moving parts and requires a few more
boxes than cassandra.
2. Ofcourse the good old Blob
Hello,
I am trying to setup a cluser (for the first time) of a few nodes. Had
a few questions related to that.
I want the following properties in my cluster:
1. Not to use RP but BOP
2. Specify initial token myself on each node.
3. Change a few memtable defaults.
4. For Keyspaces to use
Are there any details on how much of an issue fragmentation is (with
Cassandra ) ?
With all the merging and deletes that happen with during compactions,
how does the disk fragmentation look like over time ? Any thumb-rules
on how frequently and how to defrag ?
Thanks.
In PropertyFileSnitch is cassandra-rack.properties or
cassandra-topology.properties file used ?
Little confused by the stmt:
PropertyFileSnitch determines the location of nodes by referring to a
user-defined description of the network details located in the
property file
, 2011 at 1:28 PM, Jonathan Ellis jbel...@gmail.com wrote:
Did you try ls conf/ ?
On Thu, Mar 3, 2011 at 11:27 AM, A J s5a...@gmail.com wrote:
In PropertyFileSnitch is cassandra-rack.properties or
cassandra-topology.properties file used ?
Little confused by the stmt:
PropertyFileSnitch determines
using latest cassandra (0.7.2). I want to try out Network Topology Strategy.
Following is related setting in cassandra.yaml
endpoint_snitch: org.apache.cassandra.locator.PropertyFileSnitch
I have four nodes. Set them accordingly in ./conf/cassandra-topology.properties:
10.252.219.224=DC2:RAC1
why would you keep metadata in cassandra ? Even for millions of
documents, metadata would be very small, mysql/postgres should
suffice.
Luster ofcourse is well known and widely used along with glusterfs.
Luster I think requires kernel modifications and will be much more
complex. Also it is easier
Trying out stress.py on AWS EC2 environment (4 Large instances. Each
of 2-cores and 7.5GB RAM. All in the same region/zone.)
python stress.py -o insert -d
10.253.203.224,10.220.203.48,10.220.17.84,10.124.89.81 -l 2 -e ALL -t
10 -n 500 -S 100 -k
(I want to try with column size of about 1MB.
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