Databases
StackOverflow2013
Postsdbo
PO
 

Note that there are some explanatory texts on larger screens.

plurals
  1. PO
    primarykey
    data
    text
    <p>We don't use Couchbase with Erlang, but with Python, which also needs to connect with a memcache client. I can't speak to the Erlang libraries specifically, but hopefully the lessons apply in both situations.</p> <p><strong>Memcache Client Limitations</strong></p> <p>Memcache clients can only access memcache functionality. You won't be able to use views or any other features not specified in the memcache protocol. If you want access to the views, you will need to use the REST protocol separately on port 8092 (<a href="http://www.couchbase.com/docs/couchbase-manual-2.0/couchbase-views-querying-rest-api.html" rel="nofollow">docs</a>).</p> <p><strong>Connecting to Couchbase with Vanilla Memcache Clients</strong></p> <p>The ports mentioned on that page are used either internally or by "smart" clients written for Couchbase specifically. By default, memcache clients can connect to the normal memcache port 11211 on any of the nodes in your Couchbase cluster. Do not use the memcache cluster features of any memcache client not written specifically for Couchbase; the usual methods of distribution for vanilla memcached are incompatible with Couchbase.</p> <p><strong>Explanation</strong></p> <p>In order to connect with the memcached client, you need to connect to port for the Couchbase bucket directly. When you set up a new bucket, you specify the port you want the bucket to be accessible on. The default bucket is setup on port 11211. Each bucket acts like an independent memcached instance, but is internally distributed to all nodes in the cluster. You can connect to the bucket port on any of the Couchbase servers, and you will be accessing the same data set.</p> <p>This means that you should not try to use the distributed memcache features of your memcache client. Those features are designed for ad-hoc memcached clusters. Just connect to the appropriate port on the Couchbase server as if it was a single memcached server.</p> <p>The reason this is possible is because there is a Moxi instance which finds the appropriate Couchbase server to process the request. This Moxi instance automatically runs for each bucket on every Couchbase server. Even though you may not be connected to the node which has your specific key, Moxi will transparently direct your request to the appropriate server.</p> <p>In this way, you can use a vanilla Memcache client to talk to Couchbase, without needing any additional logic to keep track of cluster topology. Moxi takes care of that piece for you.</p> <p><strong>Binary protocol</strong></p> <p>We did have the binary protocol working at one point, but there were problems when we tried to use the <code>flush_all</code> command. That was a while ago, though. I suggest experimenting yourself to see if the level of support meets your needs.</p>
    singulars
    1. This table or related slice is empty.
    1. POCan Couchbase 2.0 be accessed from erlang via erlmc & memchache 1.3 protocol?
      singulars
      1. PTQuestion
    1. PTAnswer
    1. This table or related slice is empty.
    1. USkjw0188
    plurals
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. VO
      singulars
      1. PO
      1. This table or related slice is empty.
      1. VTUpMod
    1. COThe flush_all operation has been disabled by default to prevent accidental flush operations affecting the data stored in a bucket. You can enable flush_all by setting the parameter using the cbflushctl command: shell> /opt/couchbase/bin/cbflushctl localhost:11210 set flushall_enabled true setting flush param: flushall_enabled true
      singulars
      1. PO
      1. USkolchanov
 

Querying!

 
Guidance
A row detail

Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.

SQuiL has stopped working due to an internal error.

If you are curious you may find further information in the browser console, which is accessible through the devtools (F12).

Reload