Re: Counter Column
Thanks. I went through some articles which mentioned that the client to pass the timestamp for insert and update. Is that anyway we can avoid it and Cassandra assume the current time of the server? Thanks Ajay On Dec 26, 2014 10:50 PM, Eric Stevens migh...@gmail.com wrote: Timestamps are timezone independent. This is a property of timestamps, not a property of Cassandra. A given moment is the same timestamp everywhere in the world. To display this in a human readable form, you then need to know what timezone you're attempting to represent the timestamp as, this is the information necessary to convert it to local time. On Fri, Dec 26, 2014 at 2:05 AM, Ajay ajay.ga...@gmail.com wrote: Hi, If the nodes of Cassandra ring are in different timezone, could it affect the counter column as it depends on the timestamp? Thanks Ajay
Re: Counter Column
In java, http://docs.oracle.com/javase/7/docs/api/java/lang/System.html#currentTimeMillis() return the difference, measured in milliseconds, between the current time and midnight, January 1, 1970 UTC. It means the timestamp which Cassandra uses is not independent on the timezone. 2014-12-27 21:08 GMT+08:00 Ajay ajay.ga...@gmail.com: Thanks. I went through some articles which mentioned that the client to pass the timestamp for insert and update. Is that anyway we can avoid it and Cassandra assume the current time of the server? Thanks Ajay On Dec 26, 2014 10:50 PM, Eric Stevens migh...@gmail.com wrote: Timestamps are timezone independent. This is a property of timestamps, not a property of Cassandra. A given moment is the same timestamp everywhere in the world. To display this in a human readable form, you then need to know what timezone you're attempting to represent the timestamp as, this is the information necessary to convert it to local time. On Fri, Dec 26, 2014 at 2:05 AM, Ajay ajay.ga...@gmail.com wrote: Hi, If the nodes of Cassandra ring are in different timezone, could it affect the counter column as it depends on the timestamp? Thanks Ajay -- Thanks, Phil Yang
Re: Counter Column
sorry for typo.. timestamp which Cassandra uses is independent on the timezone. Usually, it is recommended to use NTP to reduce the difference of timestamps in each nodes 2014-12-27 21:20 GMT+08:00 Phil Yang ud1...@gmail.com: In java, http://docs.oracle.com/javase/7/docs/api/java/lang/System.html#currentTimeMillis() return the difference, measured in milliseconds, between the current time and midnight, January 1, 1970 UTC. It means the timestamp which Cassandra uses is not independent on the timezone. 2014-12-27 21:08 GMT+08:00 Ajay ajay.ga...@gmail.com: Thanks. I went through some articles which mentioned that the client to pass the timestamp for insert and update. Is that anyway we can avoid it and Cassandra assume the current time of the server? Thanks Ajay On Dec 26, 2014 10:50 PM, Eric Stevens migh...@gmail.com wrote: Timestamps are timezone independent. This is a property of timestamps, not a property of Cassandra. A given moment is the same timestamp everywhere in the world. To display this in a human readable form, you then need to know what timezone you're attempting to represent the timestamp as, this is the information necessary to convert it to local time. On Fri, Dec 26, 2014 at 2:05 AM, Ajay ajay.ga...@gmail.com wrote: Hi, If the nodes of Cassandra ring are in different timezone, could it affect the counter column as it depends on the timestamp? Thanks Ajay -- Thanks, Phil Yang -- Thanks, Phil Yang
Re: Counter Column
Having the client pass the timestamp is optional, if you do not provide one from the client, then it will use the server's timestamp. On Sat, Dec 27, 2014, 6:25 AM Phil Yang ud1...@gmail.com wrote: sorry for typo.. timestamp which Cassandra uses is independent on the timezone. Usually, it is recommended to use NTP to reduce the difference of timestamps in each nodes 2014-12-27 21:20 GMT+08:00 Phil Yang ud1...@gmail.com: In java, http://docs.oracle.com/javase/7/docs/api/java/lang/System.html#currentTimeMillis() return the difference, measured in milliseconds, between the current time and midnight, January 1, 1970 UTC. It means the timestamp which Cassandra uses is not independent on the timezone. 2014-12-27 21:08 GMT+08:00 Ajay ajay.ga...@gmail.com: Thanks. I went through some articles which mentioned that the client to pass the timestamp for insert and update. Is that anyway we can avoid it and Cassandra assume the current time of the server? Thanks Ajay On Dec 26, 2014 10:50 PM, Eric Stevens migh...@gmail.com wrote: Timestamps are timezone independent. This is a property of timestamps, not a property of Cassandra. A given moment is the same timestamp everywhere in the world. To display this in a human readable form, you then need to know what timezone you're attempting to represent the timestamp as, this is the information necessary to convert it to local time. On Fri, Dec 26, 2014 at 2:05 AM, Ajay ajay.ga...@gmail.com wrote: Hi, If the nodes of Cassandra ring are in different timezone, could it affect the counter column as it depends on the timestamp? Thanks Ajay -- Thanks, Phil Yang -- Thanks, Phil Yang
Re: Counter Column
Timestamps are timezone independent. This is a property of timestamps, not a property of Cassandra. A given moment is the same timestamp everywhere in the world. To display this in a human readable form, you then need to know what timezone you're attempting to represent the timestamp as, this is the information necessary to convert it to local time. On Fri, Dec 26, 2014 at 2:05 AM, Ajay ajay.ga...@gmail.com wrote: Hi, If the nodes of Cassandra ring are in different timezone, could it affect the counter column as it depends on the timestamp? Thanks Ajay
Re: Counter column impossible to delete and re-insert
Hello Clément This is a known anti-pattern. You should never re-use a deleted counter column otherwise there will be unpredictable result for the counter value. Le 6 nov. 2014 08:45, Clément Fumey clement@gmail.com a écrit : Hi, I have a table with counter column . When I insert (update) a row, delete it and try to re-insert, it fail to re-insert the row. Here is the commands i use : CREATE TABLE test( testId int, year int, testCounter counter, PRIMARY KEY (testId, year) )WITH CLUSTERING ORDER BY (year DESC); UPDATE test SET testcounter = testcounter +5 WHERE testid = 2 AND year = 2014; DELETE FROM test WHERE testid = 2 AND year = 2014; UPDATE test SET testcounter = testcounter +5 WHERE testid = 2 AND year = 2014; The last command failed, there is no error message but the table is empty after it. Is that normal? Am I doing something wrong? Regards Clément
Re: Counter column families (pending replicate on write stage tasks)
On Mon, Nov 12, 2012 at 3:35 PM, cem cayiro...@gmail.com wrote: We are currently facing a performance issue with counter column families. I see lots of pending ReplicateOnWriteStage tasks in tpstats. Then I disabled replicate_on_write. It helped a lot. I want to use like that but I am not sure how to use it. Quoting Sylvain, one of the primary authors/maintainers of the Counters support... https://issues.apache.org/jira/browse/CASSANDRA-3868 I don't disagree about the efficiency of the valve, but at what price? 'Bootstrapping a node will make you lose increments (you don't know which ones, you don't know how many and this even if nothing goes wrong)' is a pretty bad drawback. That is pretty much why that option makes me uncomfortable: it does give you better performance, so people may be tempted to use it. Now if it was only a matter of replicating writes only through read-repair/repair, then ok, it's pretty dangerous but it's rather easy to explain/understand the drawback (if you don't lose a disk, you don't lose increments, and you'd better use CL.ALL or have read_repair_chance to 1). But the fact that it doesn't work with bootstrap/move makes me wonder if having the option at all is not making a disservice to users. IOW, don't be tempted to turn off replicate_on_write. It breaks counters. If you are under capacity at a steady state, increase capacity. =Rob -- =Robert Coli AIMGTALK - rc...@palominodb.com YAHOO - rcoli.palominob SKYPE - rcoli_palominodb
Re: Counter column family
My problem was the result of Hector bug, see http://groups.google.com/group/hector-users/browse_thread/thread/8359538ed387564e So please ignore question, Thanks, *Tamar Fraenkel * Senior Software Engineer, TOK Media [image: Inline image 1] ta...@tok-media.com Tel: +972 2 6409736 Mob: +972 54 8356490 Fax: +972 2 5612956 On Tue, Apr 17, 2012 at 6:59 PM, Tamar Fraenkel ta...@tok-media.com wrote: Hi! I want to understand how incrementing of counter works. - I have a 3 node ring, - I use FailoverPolicy.FAIL_FAST, - RF is 2, I have the following counter column family ColumnFamily: tk_counters Key Validation Class: org.apache.cassandra.db.marshal.CompositeType( org.apache.cassandra.db.marshal.UTF8Type,org.apache.cassandra.db.marshal. UUIDType) Default column value validator: org.apache.cassandra.db.marshal. CounterColumnType Columns sorted by: org.apache.cassandra.db.marshal.UTF8Type Row cache size / save period in seconds / keys to save : 0.0/0/all Row Cache Provider: org.apache.cassandra.cache. SerializingCacheProvider Key cache size / save period in seconds: 0.0/14400 GC grace seconds: 864000 Compaction min/max thresholds: 4/32 Read repair chance: 1.0 Replicate on write: true Bloom Filter FP chance: default Built indexes: [] Compaction Strategy: org.apache.cassandra.db.compaction.SizeTieredCompactionStrategy My CL for this column family is Write=2, Read=1. When I increment a counter (using hector mutator), and execute returns without errors, what is the status of the nodes at that stage. Can execute return before the nodes are really updated? So that if a read is done immediately after the increment it will still read the previous values? Thanks, *Tamar Fraenkel * Senior Software Engineer, TOK Media [image: Inline image 1] ta...@tok-media.com Tel: +972 2 6409736 Mob: +972 54 8356490 Fax: +972 2 5612956 tokLogo.png
Re: counter column family
You may have better luck with Hector specific questions on the Hector User Group https://groups.google.com/forum/?fromgroups#!forum/hector-users Cheers - Aaron Morton Freelance Developer @aaronmorton http://www.thelastpickle.com On 4/04/2012, at 5:54 PM, Tamar Fraenkel wrote: Hi! So, if I am using Hector, I need to do: cassandraHostConfigurator.setRetryDownedHosts(false)? How will this affect my application generally? Thanks Tamar Fraenkel Senior Software Engineer, TOK Media tokLogo.png ta...@tok-media.com Tel: +972 2 6409736 Mob: +972 54 8356490 Fax: +972 2 5612956 On Tue, Mar 27, 2012 at 4:25 PM, R. Verlangen ro...@us2.nl wrote: You should use a connection pool without retries to prevent a single increment of +1 have a result of e.g. +3. 2012/3/27 Rishabh Agrawal rishabh.agra...@impetus.co.in You can even define how much increment you want. But let me just warn you, as far my knowledge, it has consistency issues. From: puneet loya [mailto:puneetl...@gmail.com] Sent: Tuesday, March 27, 2012 5:59 PM To: user@cassandra.apache.org Subject: Re: counter column family thanxx a ton :) :) the counter column family works synonymous as 'auto increment' in other databases rite? I mean we have a column of type integer which increments with every insert. Am i goin the rite way?? please reply :) On Tue, Mar 27, 2012 at 5:50 PM, R. Verlangen ro...@us2.nl wrote: create column family MyCounterColumnFamily with default_validation_class=CounterColumnType and key_validation_class=UTF8Type and comparator=UTF8Type; There you go! Keys must be utf8, as well as the column names. Of course you can change those validators. Cheers! 2012/3/27 puneet loya puneetl...@gmail.com Can u give an example of create column family with counter column in it. Please reply Regards, Puneet Loya -- With kind regards, Robin Verlangen www.robinverlangen.nl Impetus to sponsor and exhibit at Structure Data 2012, NY; Mar 21-22. Know more about our Big Data quick-start program at the event. New Impetus webcast ‘Cloud-enabled Performance Testing vis-à-vis On-premise’ available at http://bit.ly/z6zT4L. NOTE: This message may contain information that is confidential, proprietary, privileged or otherwise protected by law. The message is intended solely for the named addressee. If received in error, please destroy and notify the sender. Any use of this email is prohibited when received in error. Impetus does not represent, warrant and/or guarantee, that the integrity of this communication has been maintained nor that the communication is free of errors, virus, interception or interference. -- With kind regards, Robin Verlangen www.robinverlangen.nl
Re: Counter Column
On Tue, Apr 3, 2012 at 9:11 AM, Avi-h avih...@gmail.com wrote: I have encountered the following piece of information regarding the use of ‘Counter Column’ in Cassandra: “If a write fails unexpectedly (timeout or loss of connection to the coordinator node) the client will not know if the operation has been performed. A retry can result in an over count” (- quoted from http://wiki.apache.org/cassandra/Counters). is it still relevant? It is (there is an open ticket to fix, https://issues.apache.org/jira/browse/CASSANDRA-2495, but to be honest we don't really have a good solution to fix it so far). -- Sylvain
Re: Counter Column
Again, it will be relevant until CASSANDRA-2495 is fixed. Until then (then being undefined so far), it affects all version that have counters (including 1.0.8). -- Sylvain On Tue, Apr 3, 2012 at 12:23 PM, Avi-h avih...@gmail.com wrote: this bug is for 0.8 beta 1, is it also relevant for 1.0.8? -- View this message in context: http://cassandra-user-incubator-apache-org.3065146.n2.nabble.com/Counter-Column-tp7432010p7432450.html Sent from the cassandra-u...@incubator.apache.org mailing list archive at Nabble.com.
Re: Counter Column
Sylvain explained a lot of things about counters at Cassandra SF 2011 : http://blip.tv/datastax/counters-in-cassandra-5497678 (video), http://www.datastax.com/wp-content/uploads/2011/07/cassandra_sf_counters.pdf(slides). I think it is always important knowing how the things work. Alain 2012/4/3 Sylvain Lebresne sylv...@datastax.com Again, it will be relevant until CASSANDRA-2495 is fixed. Until then (then being undefined so far), it affects all version that have counters (including 1.0.8). -- Sylvain On Tue, Apr 3, 2012 at 12:23 PM, Avi-h avih...@gmail.com wrote: this bug is for 0.8 beta 1, is it also relevant for 1.0.8? -- View this message in context: http://cassandra-user-incubator-apache-org.3065146.n2.nabble.com/Counter-Column-tp7432010p7432450.html Sent from the cassandra-u...@incubator.apache.org mailing list archive at Nabble.com.
RE: Counter Column
Right, it affects every version of Cassandra from 0.8 beta 1 until the Fix Version, which right now is None, so it isn't fixed yet... From: Avi-h [avih...@gmail.com] Sent: Tuesday, April 03, 2012 5:23 AM To: cassandra-u...@incubator.apache.org Subject: Re: Counter Column this bug is for 0.8 beta 1, is it also relevant for 1.0.8? -- View this message in context: http://cassandra-user-incubator-apache-org.3065146.n2.nabble.com/Counter-Column-tp7432010p7432450.html Sent from the cassandra-u...@incubator.apache.org mailing list archive at Nabble.com.
Re: counter column family
Hi! So, if I am using Hector, I need to do: cassandraHostConfigurator.setRetryDownedHosts(false)? How will this affect my application generally? Thanks *Tamar Fraenkel * Senior Software Engineer, TOK Media [image: Inline image 1] ta...@tok-media.com Tel: +972 2 6409736 Mob: +972 54 8356490 Fax: +972 2 5612956 On Tue, Mar 27, 2012 at 4:25 PM, R. Verlangen ro...@us2.nl wrote: You should use a connection pool without retries to prevent a single increment of +1 have a result of e.g. +3. 2012/3/27 Rishabh Agrawal rishabh.agra...@impetus.co.in You can even define how much increment you want. But let me just warn you, as far my knowledge, it has consistency issues. *From:* puneet loya [mailto:puneetl...@gmail.com] *Sent:* Tuesday, March 27, 2012 5:59 PM *To:* user@cassandra.apache.org *Subject:* Re: counter column family thanxx a ton :) :) the counter column family works synonymous as 'auto increment' in other databases rite? I mean we have a column of type integer which increments with every insert. Am i goin the rite way?? please reply :) On Tue, Mar 27, 2012 at 5:50 PM, R. Verlangen ro...@us2.nl wrote: *create column family MyCounterColumnFamily with default_validation_class=CounterColumnType and key_validation_class=UTF8Type and comparator=UTF8Type;* There you go! Keys must be utf8, as well as the column names. Of course you can change those validators. Cheers! 2012/3/27 puneet loya puneetl...@gmail.com Can u give an example of create column family with counter column in it. Please reply Regards, Puneet Loya -- With kind regards, Robin Verlangen www.robinverlangen.nl -- Impetus to sponsor and exhibit at Structure Data 2012, NY; Mar 21-22. Know more about our Big Data quick-start program at the event. New Impetus webcast ‘Cloud-enabled Performance Testing vis-à-vis On-premise’ available at http://bit.ly/z6zT4L. NOTE: This message may contain information that is confidential, proprietary, privileged or otherwise protected by law. The message is intended solely for the named addressee. If received in error, please destroy and notify the sender. Any use of this email is prohibited when received in error. Impetus does not represent, warrant and/or guarantee, that the integrity of this communication has been maintained nor that the communication is free of errors, virus, interception or interference. -- With kind regards, Robin Verlangen www.robinverlangen.nl tokLogo.png
Re: counter column family
On Tue, Mar 27, 2012 at 9:35 AM, puneet loya puneetl...@gmail.com wrote: now i want to have a field incrementing with every row insertion. how do i do it in cassandra?? There's nothing that will do it automatically. You need to increment it yourself. -- Tyler Hobbs DataStax http://datastax.com/
Re: counter column family
*create column family MyCounterColumnFamily with default_validation_class=CounterColumnType and key_validation_class=UTF8Type and comparator=UTF8Type;* There you go! Keys must be utf8, as well as the column names. Of course you can change those validators. Cheers! 2012/3/27 puneet loya puneetl...@gmail.com Can u give an example of create column family with counter column in it. Please reply Regards, Puneet Loya -- With kind regards, Robin Verlangen www.robinverlangen.nl
Re: counter column family
thanxx a ton :) :) the counter column family works synonymous as 'auto increment' in other databases rite? I mean we have a column of type integer which increments with every insert. Am i goin the rite way?? please reply :) On Tue, Mar 27, 2012 at 5:50 PM, R. Verlangen ro...@us2.nl wrote: *create column family MyCounterColumnFamily with default_validation_class=CounterColumnType and key_validation_class=UTF8Type and comparator=UTF8Type;* There you go! Keys must be utf8, as well as the column names. Of course you can change those validators. Cheers! 2012/3/27 puneet loya puneetl...@gmail.com Can u give an example of create column family with counter column in it. Please reply Regards, Puneet Loya -- With kind regards, Robin Verlangen www.robinverlangen.nl
Re: counter column family
You should use a connection pool without retries to prevent a single increment of +1 have a result of e.g. +3. 2012/3/27 Rishabh Agrawal rishabh.agra...@impetus.co.in You can even define how much increment you want. But let me just warn you, as far my knowledge, it has consistency issues. *From:* puneet loya [mailto:puneetl...@gmail.com] *Sent:* Tuesday, March 27, 2012 5:59 PM *To:* user@cassandra.apache.org *Subject:* Re: counter column family thanxx a ton :) :) the counter column family works synonymous as 'auto increment' in other databases rite? I mean we have a column of type integer which increments with every insert. Am i goin the rite way?? please reply :) On Tue, Mar 27, 2012 at 5:50 PM, R. Verlangen ro...@us2.nl wrote: *create column family MyCounterColumnFamily with default_validation_class=CounterColumnType and key_validation_class=UTF8Type and comparator=UTF8Type;* There you go! Keys must be utf8, as well as the column names. Of course you can change those validators. Cheers! 2012/3/27 puneet loya puneetl...@gmail.com Can u give an example of create column family with counter column in it. Please reply Regards, Puneet Loya -- With kind regards, Robin Verlangen www.robinverlangen.nl -- Impetus to sponsor and exhibit at Structure Data 2012, NY; Mar 21-22. Know more about our Big Data quick-start program at the event. New Impetus webcast ‘Cloud-enabled Performance Testing vis-à-vis On-premise’ available at http://bit.ly/z6zT4L. NOTE: This message may contain information that is confidential, proprietary, privileged or otherwise protected by law. The message is intended solely for the named addressee. If received in error, please destroy and notify the sender. Any use of this email is prohibited when received in error. Impetus does not represent, warrant and/or guarantee, that the integrity of this communication has been maintained nor that the communication is free of errors, virus, interception or interference. -- With kind regards, Robin Verlangen www.robinverlangen.nl
Re: counter column family
wen i m using a counter column.. i m nt able to add columns of other type
to the column family.. is it so or it is just synactical error??
[default@CMDCv99] create column family status
... with comparator = AsciiType
... and column_metadata =
... [{
... column_name : Test,
... validation_class : IntegerType,
... index_type : 0,
... index_name : IdxName},
... {
... column_name : 'other name',
... validation_class : CounterColumnType
... }];
Cannot add a counter column (other name) in a non counter column family
On Tue, Mar 27, 2012 at 6:55 PM, R. Verlangen ro...@us2.nl wrote:
You should use a connection pool without retries to prevent a single
increment of +1 have a result of e.g. +3.
2012/3/27 Rishabh Agrawal rishabh.agra...@impetus.co.in
You can even define how much increment you want. But let me just warn
you, as far my knowledge, it has consistency issues.
*From:* puneet loya [mailto:puneetl...@gmail.com]
*Sent:* Tuesday, March 27, 2012 5:59 PM
*To:* user@cassandra.apache.org
*Subject:* Re: counter column family
thanxx a ton :) :)
the counter column family works synonymous as 'auto increment' in other
databases rite?
I mean we have a column of type integer which increments with every
insert.
Am i goin the rite way??
please reply :)
On Tue, Mar 27, 2012 at 5:50 PM, R. Verlangen ro...@us2.nl wrote:
*create column family MyCounterColumnFamily with
default_validation_class=CounterColumnType and
key_validation_class=UTF8Type and comparator=UTF8Type;*
There you go! Keys must be utf8, as well as the column names. Of course
you can change those validators.
Cheers!
2012/3/27 puneet loya puneetl...@gmail.com
Can u give an example of create column family with counter column in it.
Please reply
Regards,
Puneet Loya
--
With kind regards,
Robin Verlangen
www.robinverlangen.nl
--
Impetus to sponsor and exhibit at Structure Data 2012, NY; Mar 21-22.
Know more about our Big Data quick-start program at the event.
New Impetus webcast ‘Cloud-enabled Performance Testing vis-à-vis
On-premise’ available at http://bit.ly/z6zT4L.
NOTE: This message may contain information that is confidential,
proprietary, privileged or otherwise protected by law. The message is
intended solely for the named addressee. If received in error, please
destroy and notify the sender. Any use of this email is prohibited when
received in error. Impetus does not represent, warrant and/or guarantee,
that the integrity of this communication has been maintained nor that the
communication is free of errors, virus, interception or interference.
--
With kind regards,
Robin Verlangen
www.robinverlangen.nl
Re: counter column family
Counter columns are special, they must be in a column family to themselves.
On 03/27/2012 09:32 AM, puneet loya wrote:
wen i m using a counter column.. i m nt able to add columns of other
type to the column family.. is it so or it is just synactical error??
[default@CMDCv99] create column family status
... with comparator = AsciiType
... and column_metadata =
... [{
... column_name : Test,
... validation_class : IntegerType,
... index_type : 0,
... index_name : IdxName},
... {
... column_name : 'other name',
... validation_class : CounterColumnType
... }];
Cannot add a counter column (other name) in a non counter column family
On Tue, Mar 27, 2012 at 6:55 PM, R. Verlangen ro...@us2.nl
mailto:ro...@us2.nl wrote:
You should use a connection pool without retries to prevent a
single increment of +1 have a result of e.g. +3.
2012/3/27 Rishabh Agrawal rishabh.agra...@impetus.co.in
mailto:rishabh.agra...@impetus.co.in
You can even define how much increment you want. But let me
just warn you, as far my knowledge, it has consistency issues.
*From:*puneet loya [mailto:puneetl...@gmail.com
mailto:puneetl...@gmail.com]
*Sent:* Tuesday, March 27, 2012 5:59 PM
*To:* user@cassandra.apache.org mailto:user@cassandra.apache.org
*Subject:* Re: counter column family
thanxx a ton :) :)
the counter column family works synonymous as 'auto increment'
in other databases rite?
I mean we have a column of type integer which increments with
every insert.
Am i goin the rite way??
please reply :)
On Tue, Mar 27, 2012 at 5:50 PM, R. Verlangen ro...@us2.nl
mailto:ro...@us2.nl wrote:
*create column family MyCounterColumnFamily with
default_validation_class=CounterColumnType and
key_validation_class=UTF8Type and comparator=UTF8Type;*
There you go! Keys must be utf8, as well as the column names.
Of course you can change those validators.
Cheers!
2012/3/27 puneet loya puneetl...@gmail.com
mailto:puneetl...@gmail.com
Can u give an example of create column family with counter
column in it.
Please reply
Regards,
Puneet Loya
--
With kind regards,
Robin Verlangen
www.robinverlangen.nl http://www.robinverlangen.nl
Impetus to sponsor and exhibit at Structure Data 2012, NY; Mar
21-22. Know more about our Big Data quick-start program at the
event.
New Impetus webcast ‘Cloud-enabled Performance Testing
vis-à-vis On-premise’ available at http://bit.ly/z6zT4L.
NOTE: This message may contain information that is
confidential, proprietary, privileged or otherwise protected
by law. The message is intended solely for the named
addressee. If received in error, please destroy and notify the
sender. Any use of this email is prohibited when received in
error. Impetus does not represent, warrant and/or guarantee,
that the integrity of this communication has been maintained
nor that the communication is free of errors, virus,
interception or interference.
--
With kind regards,
Robin Verlangen
www.robinverlangen.nl http://www.robinverlangen.nl
Re: counter column family
now i want to have a field incrementing with every row insertion. how do i
do it in cassandra??
On Tue, Mar 27, 2012 at 7:34 PM, Dave Brosius dbros...@mebigfatguy.comwrote:
Counter columns are special, they must be in a column family to
themselves.
On 03/27/2012 09:32 AM, puneet loya wrote:
wen i m using a counter column.. i m nt able to add columns of other type
to the column family.. is it so or it is just synactical error??
[default@CMDCv99] create column family status
... with comparator = AsciiType
... and column_metadata =
... [{
... column_name : Test,
... validation_class : IntegerType,
... index_type : 0,
... index_name : IdxName},
... {
... column_name : 'other name',
... validation_class : CounterColumnType
... }];
Cannot add a counter column (other name) in a non counter column family
On Tue, Mar 27, 2012 at 6:55 PM, R. Verlangen ro...@us2.nl wrote:
You should use a connection pool without retries to prevent a single
increment of +1 have a result of e.g. +3.
2012/3/27 Rishabh Agrawal rishabh.agra...@impetus.co.in
You can even define how much increment you want. But let me just warn
you, as far my knowledge, it has consistency issues.
*From:* puneet loya [mailto:puneetl...@gmail.com]
*Sent:* Tuesday, March 27, 2012 5:59 PM
*To:* user@cassandra.apache.org
*Subject:* Re: counter column family
thanxx a ton :) :)
the counter column family works synonymous as 'auto increment' in other
databases rite?
I mean we have a column of type integer which increments with every
insert.
Am i goin the rite way??
please reply :)
On Tue, Mar 27, 2012 at 5:50 PM, R. Verlangen ro...@us2.nl wrote:
*create column family MyCounterColumnFamily with
default_validation_class=CounterColumnType and
key_validation_class=UTF8Type and comparator=UTF8Type;*
There you go! Keys must be utf8, as well as the column names. Of course
you can change those validators.
Cheers!
2012/3/27 puneet loya puneetl...@gmail.com
Can u give an example of create column family with counter column in it.
Please reply
Regards,
Puneet Loya
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Re: Counter Column Family Inconsistent Node
yeah, sorry about that... pushed click before I added my comments. I have a cluster of 5 nodes using 0.8.4 where I am using counters. One one of my nodes, every time I do a list command I get different results. The counters jump all over the place. Any ideas? I have run nodetool repair on all nodes. Thanks! Ryan On Tue, Aug 16, 2011 at 1:18 PM, Ryan Lowe ryanjl...@gmail.com wrote: [default@Race] list CounterCF; Using default limit of 100 --- RowKey: Stats = (counter=APP, value=7503) = (counter=FILEUPLOAD, value=155) = (counter=MQUPLOAD, value=4726775) = (counter=PAGES, value=131948) = (counter=REST, value=3) = (counter=SOAP, value=44) = (counter=WS, value=1943) 1 Row Returned. [default@Race] list CounterCF; Using default limit of 100 --- RowKey: Stats = (counter=APP, value=93683) = (counter=FILEUPLOAD, value=347) = (counter=MQUPLOAD, value=14961065367) = (counter=PAGES, value=183089568) = (counter=REST, value=3) = (counter=SOAP, value=44) = (counter=WS, value=23972) 1 Row Returned. [default@Race] list CounterCF; Using default limit of 100 --- RowKey: Stats = (counter=APP, value=7503) = (counter=FILEUPLOAD, value=155) = (counter=MQUPLOAD, value=4726775) = (counter=PAGES, value=131948) = (counter=REST, value=3) = (counter=SOAP, value=44) = (counter=WS, value=1943) 1 Row Returned. [default@Race] list CounterCF; Using default limit of 100 --- RowKey: Stats = (counter=APP, value=7503) = (counter=FILEUPLOAD, value=155) = (counter=MQUPLOAD, value=4726775) = (counter=PAGES, value=131948) = (counter=REST, value=3) = (counter=SOAP, value=44) = (counter=WS, value=1943)
Re: Counter Column Family Inconsistent Node
May be the same as https://issues.apache.org/jira/browse/CASSANDRA-3006 ? On Tue, Aug 16, 2011 at 12:20 PM, Ryan Lowe ryanjl...@gmail.com wrote: yeah, sorry about that... pushed click before I added my comments. I have a cluster of 5 nodes using 0.8.4 where I am using counters. One one of my nodes, every time I do a list command I get different results. The counters jump all over the place. Any ideas? I have run nodetool repair on all nodes. Thanks! Ryan On Tue, Aug 16, 2011 at 1:18 PM, Ryan Lowe ryanjl...@gmail.com wrote: [default@Race] list CounterCF; Using default limit of 100 --- RowKey: Stats = (counter=APP, value=7503) = (counter=FILEUPLOAD, value=155) = (counter=MQUPLOAD, value=4726775) = (counter=PAGES, value=131948) = (counter=REST, value=3) = (counter=SOAP, value=44) = (counter=WS, value=1943) 1 Row Returned. [default@Race] list CounterCF; Using default limit of 100 --- RowKey: Stats = (counter=APP, value=93683) = (counter=FILEUPLOAD, value=347) = (counter=MQUPLOAD, value=14961065367) = (counter=PAGES, value=183089568) = (counter=REST, value=3) = (counter=SOAP, value=44) = (counter=WS, value=23972) 1 Row Returned. [default@Race] list CounterCF; Using default limit of 100 --- RowKey: Stats = (counter=APP, value=7503) = (counter=FILEUPLOAD, value=155) = (counter=MQUPLOAD, value=4726775) = (counter=PAGES, value=131948) = (counter=REST, value=3) = (counter=SOAP, value=44) = (counter=WS, value=1943) 1 Row Returned. [default@Race] list CounterCF; Using default limit of 100 --- RowKey: Stats = (counter=APP, value=7503) = (counter=FILEUPLOAD, value=155) = (counter=MQUPLOAD, value=4726775) = (counter=PAGES, value=131948) = (counter=REST, value=3) = (counter=SOAP, value=44) = (counter=WS, value=1943) -- Jonathan Ellis Project Chair, Apache Cassandra co-founder of DataStax, the source for professional Cassandra support http://www.datastax.com
Re: Counter Column Family Inconsistent Node
Actually I think it was more related to our servers getting their time out of sync... after finding this article: http://ria101.wordpress.com/2011/02/08/cassandra-the-importance-of-system-clocks-avoiding-oom-and-how-to-escape-oom-meltdown/ I checked our servers, and sure enough, 2 of them were out of sync with each other with more than a 2 min difference! I reconfigured ntp and I think I am back in business. Thanks though! Ryan On Tue, Aug 16, 2011 at 2:53 PM, Jonathan Ellis jbel...@gmail.com wrote: May be the same as https://issues.apache.org/jira/browse/CASSANDRA-3006 ? On Tue, Aug 16, 2011 at 12:20 PM, Ryan Lowe ryanjl...@gmail.com wrote: yeah, sorry about that... pushed click before I added my comments. I have a cluster of 5 nodes using 0.8.4 where I am using counters. One one of my nodes, every time I do a list command I get different results. The counters jump all over the place. Any ideas? I have run nodetool repair on all nodes. Thanks! Ryan On Tue, Aug 16, 2011 at 1:18 PM, Ryan Lowe ryanjl...@gmail.com wrote: [default@Race] list CounterCF; Using default limit of 100 --- RowKey: Stats = (counter=APP, value=7503) = (counter=FILEUPLOAD, value=155) = (counter=MQUPLOAD, value=4726775) = (counter=PAGES, value=131948) = (counter=REST, value=3) = (counter=SOAP, value=44) = (counter=WS, value=1943) 1 Row Returned. [default@Race] list CounterCF; Using default limit of 100 --- RowKey: Stats = (counter=APP, value=93683) = (counter=FILEUPLOAD, value=347) = (counter=MQUPLOAD, value=14961065367) = (counter=PAGES, value=183089568) = (counter=REST, value=3) = (counter=SOAP, value=44) = (counter=WS, value=23972) 1 Row Returned. [default@Race] list CounterCF; Using default limit of 100 --- RowKey: Stats = (counter=APP, value=7503) = (counter=FILEUPLOAD, value=155) = (counter=MQUPLOAD, value=4726775) = (counter=PAGES, value=131948) = (counter=REST, value=3) = (counter=SOAP, value=44) = (counter=WS, value=1943) 1 Row Returned. [default@Race] list CounterCF; Using default limit of 100 --- RowKey: Stats = (counter=APP, value=7503) = (counter=FILEUPLOAD, value=155) = (counter=MQUPLOAD, value=4726775) = (counter=PAGES, value=131948) = (counter=REST, value=3) = (counter=SOAP, value=44) = (counter=WS, value=1943) -- Jonathan Ellis Project Chair, Apache Cassandra co-founder of DataStax, the source for professional Cassandra support http://www.datastax.com
Re: Counter Column
On 27/06/2011 19:19, Sylvain Lebresne wrote: Let me make that simpler. Don't ever use replicate_on_write=false (even if you think that it is what you want, there is a good chance it's not). Obviously, the default is replicate_on_write=true. I may be wrong. But with 0.8.0, I think the default is replicate_on_write=false, you have to declare it explicitly. -- Donal Zang Computing Center, IHEP 19B YuquanLu, Shijingshan District,Beijing, 100049 zan...@ihep.ac.cn 86 010 8823 6018
Re: Counter Column
On Tue, Jun 28, 2011 at 12:53 PM, Donal Zang zan...@ihep.ac.cn wrote: On 27/06/2011 19:19, Sylvain Lebresne wrote: Let me make that simpler. Don't ever use replicate_on_write=false (even if you think that it is what you want, there is a good chance it's not). Obviously, the default is replicate_on_write=true. I may be wrong. But with 0.8.0, I think the default is replicate_on_write=false, you have to declare it explicitly. No, after having checked, you are right, the default is false and it is a bug (literally a bug, the default is true in the code, but it doesn't get applied correctly and it end up defaulting to false uniquely because it is the default value of a boolean in java -- https://issues.apache.org/jira/browse/CASSANDRA-2835). That bug will be fixed in 0.8.2. I sincerely apologize about that, you have to explicitly set replicate_on_write to true for now. The rest stays true. -- Sylvain -- Donal Zang Computing Center, IHEP 19B YuquanLu, Shijingshan District,Beijing, 100049 zan...@ihep.ac.cn 86 010 8823 6018
Re: Counter Column
On 27/06/2011 17:04, Artem Orobets wrote: Hi! As I know, we use counter column only with replication factor ALL, so is it mean that we can't read data while any replica will fail? you can use any consistency level, using replicate_on_write=true when create the counter column family. -- Donal Zang Computing Center, IHEP 19B YuquanLu, Shijingshan District,Beijing, 100049 zan...@ihep.ac.cn 86 010 8823 6018
Re: Counter Column
if i write at ALL and read at ONE,is that setting required ? thanks Le 27 juin 2011 17:22, Donal Zang zan...@ihep.ac.cn a écrit : On 27/06/2011 17:04, Artem Orobets wrote: Hi! As I know, we use counter column only with replication factor ALL, so is it mean that we can't read data while any replica will fail? you can use any consistency level, using replicate_on_write=true when create the counter column family. -- Donal Zang Computing Center, IHEP 19B YuquanLu, Shijingshan District,Beijing, 100049 zan...@ihep.ac.cn 86 010 8823 6018
Re: Counter Column
Let me make that simpler. Don't ever use replicate_on_write=false (even if you think that it is what you want, there is a good chance it's not). Obviously, the default is replicate_on_write=true. -- Sylvain On Mon, Jun 27, 2011 at 7:03 PM, Philippe watche...@gmail.com wrote: if i write at ALL and read at ONE,is that setting required ? thanks Le 27 juin 2011 17:22, Donal Zang zan...@ihep.ac.cn a écrit : On 27/06/2011 17:04, Artem Orobets wrote: Hi! As I know, we use counter column only with replication factor ALL, so is it mean that we can't read data while any replica will fail? you can use any consistency level, using replicate_on_write=true when create the counter column family. -- Donal Zang Computing Center, IHEP 19B YuquanLu, Shijingshan District,Beijing, 100049 zan...@ihep.ac.cn 86 010 8823 6018
Re: Counter Column in Cassandra
It's a column whose content represents a distributed counter. http://wiki.apache.org/cassandra/Counters On Mon, Jun 13, 2011 at 8:29 AM, Sijie YANG iyan...@gmail.com wrote: Hi, All I am newbie to cassandra. I have a simple question but don't find any clear answer by searching google: What's the meaning of counter column in Cassandra? Best
Re: Counter Column family Cassandra 0.8 PHP Support ?
I'm not a php type person, but I can help a little with thrift. Install thrift 0.6 and then run this in the interface/ directory of the cassandra source... thrift --gen php cassandra.thrift You should end up with the interface/gen-php/ Hope that helps. - Aaron Morton Freelance Cassandra Developer @aaronmorton http://www.thelastpickle.com On 17 May 2011, at 11:26, bhanu choudhary wrote: I am using counters to read the counts on my website dynamically. I am looking for phpcassandra client(?) that supports counters natively. I was looking if any PHP developer could give me a lead in generating the PHP client code required using thrift. Thanks in advance!
