Ryan Ruel created CURATOR-690:
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Summary: CuratorCache fails to load the cache if there are more
than 64K child ZNodes
Key: CURATOR-690
URL: https://issues.apache.org/jira/browse/CURATOR-690
Project: Apache Curator
Issue Type: Improvement
Components: Recipes
Affects Versions: 5.5.0
Reporter: Ryan Ruel
Fix For: 5.6.0
If there are more than 64K nodes in a tree which CuratorCache is watching, the
following exception is thrown:
{code:java}
java.lang.IllegalStateException: Attempt to register more than 65535 parties
for
org.apache.curator.framework.recipes.cache.CuratorCacheImpl$1@52354867[phase =
0 parties = 65535 arrived = 0]{code}
As shown in the exception, this is due to the fact that
java.util.concurrent.Phaser hard-limits the maximum number of Phaser
registrants to 0xfff (64K).
A note in the Phaser documentation indicates why this limit exist and proposes
a solution using Tiered Phasers:
"Implementation notes: This implementation restricts the maximum number of
parties to 65535. Attempts to register additional parties result in
IllegalStateException. However, you can and should create tiered phasers to
accommodate arbitrarily large sets of participants."
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