I have a 3 node cluster with a replication factor of 2, running on 0.4
RC1. I've set both my read and write consistency levels to use a
quorum.
I'm observing that quorum reads keep invoking read repair and log
DigestMismatchExceptions from the StorageProxy. Obviously, this
significantly reduces
.
On Mon, Sep 28, 2009 at 4:30 PM, Edmond Lau edm...@ooyala.com wrote:
On Fri, Sep 25, 2009 at 8:10 PM, Jonathan Ellis jbel...@gmail.com wrote:
No, you're mixing two related concepts.
When you do a quorum read it will fetch the actual data from one
replica and do digest reads from the others
For folks who are using or considering using cassandra in their
production systems, what do you use for backups?
With HBase, one could potentially write a mapreduce to perform a row
scan of the entire table (restricted to some historical timestamp to
get a consistent view) and export the data to
Thanks for the replies guys. It sounds like restoration via snapshots
+ some application-side logic to sanity check/repair any data around
the snapshot time is the way to go.
Edmond
On Mon, Oct 5, 2009 at 10:15 AM, Jonathan Ellis jbel...@gmail.com wrote:
On Mon, Oct 5, 2009 at 11:23 AM,
The get_slice() API takes a ColumnParent and a predicate, which means
that I can either 1) pick one super column and slice its constituent
subcolumns or 2) slice the super columns and pick up all constituent
subcolumns. What I'd like to do instead is to take a slice of
supercolumns and then a
out?
-Jonathan
On Thu, Oct 15, 2009 at 12:51 PM, Edmond Lau edm...@ooyala.com wrote:
I'm using the cassandra 0.4 release. I was loading a bunch of data
into cassandra when the thrift api started throwing
UnavailableExceptions. Checking the logs, I found errors that looked
like the following
Jonathan -
I patched in your latest change that dropped the assertions and tried
to restart my cluster on my old data. 2 of 5 nodes still failed to
start, with different errors.
One dies with a generic EOFException during recovery:
INFO - Compacting
Whenever I try to do a quorum read on a row with a particularly large
supercolumn with get_slice under high load, cassandra throws timeouts.
The reads for that row repeatedly fail until load decreases, but
smaller reads still succeed during that time. bin/nodeprobe info
shows that the read
!
On Mon, Oct 19, 2009 at 7:11 PM, Edmond Lau edm...@ooyala.com wrote:
I wasn't able to apply the patch and reuse the old tables, but after
nuking the data, I'm no longer running into the issue anymore.
On Fri, Oct 16, 2009 at 3:16 PM, Jonathan Ellis jbel...@gmail.com wrote:
Those are both
at 5:36 PM, Jonathan Ellis jbel...@gmail.com wrote:
How much of the row that fails are you trying to read at once?
On Mon, Oct 19, 2009 at 7:30 PM, Edmond Lau edm...@ooyala.com wrote:
Whenever I try to do a quorum read on a row with a particularly large
supercolumn with get_slice under high load
Comments inline.
On Mon, Oct 19, 2009 at 6:33 PM, Jonathan Ellis jbel...@gmail.com wrote:
On Mon, Oct 19, 2009 at 8:20 PM, Edmond Lau edm...@ooyala.com wrote:
On Mon, Oct 19, 2009 at 6:01 PM, Jonathan Ellis jbel...@gmail.com wrote:
are there many rows like this?
No - just a handful. I'm
the repair should've
been unnecessary.
Thanks for your help,
Edmond
-Jonathan
On Mon, Oct 19, 2009 at 11:38 PM, Edmond Lau edm...@ooyala.com wrote:
A single local read with debug logging takes 3-4 secs on the node with
3 data files. It actually takes roughly as long on the other nodes
Ellis jbel...@gmail.com wrote:
What is your columnfamily definition? What query should I test with?
On Wed, Oct 21, 2009 at 7:33 PM, Edmond Lau edm...@ooyala.com wrote:
On Tue, Oct 20, 2009 at 2:03 PM, Jonathan Ellis jbel...@gmail.com wrote:
Okay, so we have 2 problems:
- the read is simply
CompareWith=BytesType Name=Movie/
On Thu, Oct 22, 2009 at 12:04 PM, Jonathan Ellis jbel...@gmail.com wrote:
On Thu, Oct 22, 2009 at 10:59 AM, Edmond Lau edm...@ooyala.com wrote:
Try:
keyspace: Analytics
key: o:movie
column family: movie
super column: all
I was able to get timeouts with a few
Thanks for the help Jonathan. Given that the current implementation
isn't optimized for large supercolumns and given that the current
thrift api doesn't support slicing a set of columns across multiple
supercolumns of the same row anyway, I agree that I'd be better off
just folding my
I'd like to improve my mental model of how Cassandra bootstrapping
works. My understanding is that bootstrapping is just an extra step
during a node's startup where the node copies data from neighboring
nodes that, according to its token, it should own; afterwards, the
node behaves like any other
On Tue, Oct 27, 2009 at 10:02 PM, Jonathan Ellis jbel...@gmail.com wrote:
On Tue, Oct 27, 2009 at 10:10 PM, Edmond Lau edm...@ooyala.com wrote:
I'd like to improve my mental model of how Cassandra bootstrapping
works. My understanding is that bootstrapping is just an extra step
during
On Thu, Oct 29, 2009 at 1:20 PM, Jonathan Ellis jbel...@gmail.com wrote:
On Thu, Oct 29, 2009 at 1:18 PM, Edmond Lau edm...@ooyala.com wrote:
I have a freshly started 3-node cluster with a replication factor of
2. If I take down two nodes, I can no longer do any writes, even
)
at
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
at java.lang.Thread.run(Thread.java:619)
Oddly, a write with a consistency level of QUORUM succeeds for certain
keys (but fails with others) even though I only have one live node.
Edmond
On Thu, Oct 29, 2009 at 1:38 PM, Edmond Lau edm
at 3:37 PM, Edmond Lau edm...@ooyala.com wrote:
I've updated to trunk, and I'm still hitting the same issue but it's
manifesting itself differently. Again, I'm running with a freshly
started 3-node cluster with a replication factor of 2. I then take
down two nodes.
If I write
CASSANDRA-524
On Thu, Oct 29, 2009 at 2:56 PM, Edmond Lau edm...@ooyala.com wrote:
Will do.
On Thu, Oct 29, 2009 at 2:39 PM, Jonathan Ellis jbel...@gmail.com wrote:
can you create a ticket for this?
On Thu, Oct 29, 2009 at 3:39 PM, Jonathan Ellis jbel...@gmail.com wrote:
I've seen that bug
What's the difference between the memtable and the binary memtable in
cassandra? I've seen binary memtable used in discussions relating to
MapReduce. When is each one used?
Edmond
On Fri, Nov 13, 2009 at 12:20 AM, TuxRacer69 tuxrace...@gmail.com wrote:
Hello Cassandra Users!
On the wiki page:
http://wiki.apache.org/cassandra/ArticlesAndPresentations
there is a link to J. Ellis pdf:
/browse/THRIFT-395,
https://issues.apache.org/jira/browse/THRIFT-414) is that this won't
be fixed any time soon.
-Jonathan
On Mon, Dec 7, 2009 at 4:56 PM, Edmond Lau edm...@ooyala.com wrote:
This particular client was in Ruby.
On Mon, Dec 7, 2009 at 2:49 PM, Jonathan Ellis jbel...@gmail.com wrote
-row column indexes.)
On Thu, Feb 25, 2010 at 8:56 PM, Edmond Lau edm...@ooyala.com wrote:
Given that Cassandra needs to maintain tombstones to handle
distributed deletes, does the existence of deleted columns slow down
slices?
To be more concrete, suppose I used a row as a queue. I keep
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