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Posted to user@zookeeper.apache.org by David Rosenstrauch <da...@darose.net> on 2010/10/06 00:20:37 UTC
Create node with ancestors?
The ZK "create" method explicitly states in the documentation "If the
parent node does not exist in the ZooKeeper, a KeeperException with
error code KeeperException.NoNode will be thrown." (
(http://hadoop.apache.org/zookeeper/docs/current/api/org/apache/zookeeper/ZooKeeper.html#create%28java.lang.String,%20byte[],%20java.util.List,%20org.apache.zookeeper.CreateMode%29))
As a result, there doesn't appear to be any one single method call
that can create a node, along with any missing parent nodes. This would
be an incredibly useful API call, though, akin to HDFS' "mkdirs" method
call.
(http://hadoop.apache.org/common/docs/r0.20.1/api/org/apache/hadoop/fs/FileSystem.html#mkdirs%28org.apache.hadoop.fs.Path%29)
Anybody know if there's a call like this available somewhere in the ZK API?
Thanks,
DR
Re: Create node with ancestors?
Posted by David Rosenstrauch <da...@darose.net>.
Yeah, I guess I'll have to whip up something similar.
Thanks,
DR
On 10/07/2010 11:43 AM, Jared Cantwell wrote:
> We just wrote a very simple helper method that splits the path up and
> creates each parent in the path. Its a total of 5 lines of code.
> This isn't as efficient as it can be though if you're doing it
> frequently (which we don't do), but it works for us.
>
> ~Jared
>
> On Thu, Oct 7, 2010 at 11:35 AM, David Rosenstrauch<da...@darose.net> wrote:
>> On 10/05/2010 06:20 PM, David Rosenstrauch wrote:
>>>
>>> The ZK "create" method explicitly states in the documentation "If the
>>> parent node does not exist in the ZooKeeper, a KeeperException with
>>> error code KeeperException.NoNode will be thrown." (
>>>
>>> (http://hadoop.apache.org/zookeeper/docs/current/api/org/apache/zookeeper/ZooKeeper.html#create%28java.lang.String,%20byte[],%20java.util.List,%20org.apache.zookeeper.CreateMode%29))
>>> As a result, there doesn't appear to be any one single method call that
>>> can create a node, along with any missing parent nodes. This would be an
>>> incredibly useful API call, though, akin to HDFS' "mkdirs" method call.
>>>
>>> (http://hadoop.apache.org/common/docs/r0.20.1/api/org/apache/hadoop/fs/FileSystem.html#mkdirs%28org.apache.hadoop.fs.Path%29)
>>>
>>>
>>> Anybody know if there's a call like this available somewhere in the ZK
>>> API?
>>>
>>> Thanks,
>>>
>>> DR
>>
>> I guess that's a no. :-(
>>
>> DR
Re: Create node with ancestors?
Posted by Jared Cantwell <ja...@gmail.com>.
We just wrote a very simple helper method that splits the path up and
creates each parent in the path. Its a total of 5 lines of code.
This isn't as efficient as it can be though if you're doing it
frequently (which we don't do), but it works for us.
~Jared
On Thu, Oct 7, 2010 at 11:35 AM, David Rosenstrauch <da...@darose.net> wrote:
> On 10/05/2010 06:20 PM, David Rosenstrauch wrote:
>>
>> The ZK "create" method explicitly states in the documentation "If the
>> parent node does not exist in the ZooKeeper, a KeeperException with
>> error code KeeperException.NoNode will be thrown." (
>>
>> (http://hadoop.apache.org/zookeeper/docs/current/api/org/apache/zookeeper/ZooKeeper.html#create%28java.lang.String,%20byte[],%20java.util.List,%20org.apache.zookeeper.CreateMode%29))
>> As a result, there doesn't appear to be any one single method call that
>> can create a node, along with any missing parent nodes. This would be an
>> incredibly useful API call, though, akin to HDFS' "mkdirs" method call.
>>
>> (http://hadoop.apache.org/common/docs/r0.20.1/api/org/apache/hadoop/fs/FileSystem.html#mkdirs%28org.apache.hadoop.fs.Path%29)
>>
>>
>> Anybody know if there's a call like this available somewhere in the ZK
>> API?
>>
>> Thanks,
>>
>> DR
>
> I guess that's a no. :-(
>
> DR
>
Re: Create node with ancestors?
Posted by David Rosenstrauch <da...@darose.net>.
On 10/05/2010 06:20 PM, David Rosenstrauch wrote:
> The ZK "create" method explicitly states in the documentation "If the
> parent node does not exist in the ZooKeeper, a KeeperException with
> error code KeeperException.NoNode will be thrown." (
> (http://hadoop.apache.org/zookeeper/docs/current/api/org/apache/zookeeper/ZooKeeper.html#create%28java.lang.String,%20byte[],%20java.util.List,%20org.apache.zookeeper.CreateMode%29))
> As a result, there doesn't appear to be any one single method call that
> can create a node, along with any missing parent nodes. This would be an
> incredibly useful API call, though, akin to HDFS' "mkdirs" method call.
> (http://hadoop.apache.org/common/docs/r0.20.1/api/org/apache/hadoop/fs/FileSystem.html#mkdirs%28org.apache.hadoop.fs.Path%29)
>
>
> Anybody know if there's a call like this available somewhere in the ZK API?
>
> Thanks,
>
> DR
I guess that's a no. :-(
DR