public enum CreateOption extends Enum<CreateOption>
Enum Constant and Description |
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compress
Cause the data to be compressed using the configured compression provider
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createParentsAsContainers
Causes any parent nodes to get created using
CreateMode.CONTAINER if they haven't already been. |
createParentsIfNeeded
Causes any parent nodes to get created if they haven't already been
|
doProtected
Hat-tip to https://github.com/sbridges for pointing this out
|
setDataIfExists
If the ZNode already exists, Curator will instead call setData()
|
Modifier and Type | Method and Description |
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static CreateOption |
valueOf(String name)
Returns the enum constant of this type with the specified name.
|
static CreateOption[] |
values()
Returns an array containing the constants of this enum type, in
the order they are declared.
|
public static final CreateOption createParentsIfNeeded
public static final CreateOption createParentsAsContainers
CreateMode.CONTAINER
if they haven't already been.
IMPORTANT NOTE: container creation is a new feature in recent versions of ZooKeeper.
If the ZooKeeper version you're using does not support containers, the parent nodes
are created as ordinary PERSISTENT nodes.public static final CreateOption doProtected
Hat-tip to https://github.com/sbridges for pointing this out
It turns out there is an edge case that exists when creating sequential-ephemeral nodes. The creation can succeed on the server, but the server can crash before the created node name is returned to the client. However, the ZK session is still valid so the ephemeral node is not deleted. Thus, there is no way for the client to determine what node was created for them.
Even without sequential-ephemeral, however, the create can succeed on the sever but the client (for various reasons) will not know it.
Putting the create builder into protection mode works around this. The name of the node that is created is prefixed with a GUID. If node creation fails the normal retry mechanism will occur. On the retry, the parent path is first searched for a node that has the GUID in it. If that node is found, it is assumed to be the lost node that was successfully created on the first try and is returned to the caller.
public static final CreateOption compress
public static final CreateOption setDataIfExists
public static CreateOption[] values()
for (CreateOption c : CreateOption.values()) System.out.println(c);
public static CreateOption valueOf(String name)
name
- the name of the enum constant to be returned.IllegalArgumentException
- if this enum type has no constant with the specified nameNullPointerException
- if the argument is nullCopyright © 2011–2023 The Apache Software Foundation. All rights reserved.