[
https://issues.apache.org/jira/browse/CASSANDRA-10099?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15042146#comment-15042146
]
Jeremiah Jordan commented on CASSANDRA-10099:
---------------------------------------------
second commit has compile errors. Need to specify some types.
{noformat}
[javac]
/Users/jeremiah/github/riptano/cassandra/src/java/org/apache/cassandra/db/compaction/DateTieredCompactionStrategy.java:41:
error: method newSetFromMap in class Collections cannot be applied to given
types;
[javac] private final Set<SSTableReader> sstables =
Collections.newSetFromMap(new ConcurrentHashMap<>());
[javac] ^
[javac] required: Map<E,Boolean>
[javac] found: ConcurrentHashMap<Object,Object>
[javac] reason: no instance(s) of type variable(s) E exist so that
argument type ConcurrentHashMap<Object,Object> conforms to formal parameter
type Map<E,Boolean>
[javac] where E is a type-variable:
[javac] E extends Object declared in method
<E>newSetFromMap(Map<E,Boolean>)
[javac]
/Users/jeremiah/github/riptano/cassandra/src/java/org/apache/cassandra/db/compaction/SizeTieredCompactionStrategy.java:65:
error: method newSetFromMap in class Collections cannot be applied to given
types;
[javac] private final Set<SSTableReader> sstables =
Collections.newSetFromMap(new ConcurrentHashMap<>());
[javac] ^
[javac] required: Map<E,Boolean>
[javac] found: ConcurrentHashMap<Object,Object>
[javac] reason: no instance(s) of type variable(s) E exist so that
argument type ConcurrentHashMap<Object,Object> conforms to formal parameter
type Map<E,Boolean>
[javac] where E is a type-variable:
[javac] E extends Object declared in method
<E>newSetFromMap(Map<E,Boolean>)
{noformat}
> Improve concurrency in CompactionStrategyManager
> ------------------------------------------------
>
> Key: CASSANDRA-10099
> URL: https://issues.apache.org/jira/browse/CASSANDRA-10099
> Project: Cassandra
> Issue Type: Improvement
> Reporter: Yuki Morishita
> Assignee: Marcus Eriksson
> Fix For: 2.1.x, 2.2.x, 3.x
>
>
> Continue discussion from CASSANDRA-9882.
> CompactionStrategyManager(WrappingCompactionStrategy for <3.0) tracks SSTable
> changes mainly for separating repaired / unrepaired SSTables (+ LCS manages
> level).
> This is blocking operation, and can lead to block of flush etc. when
> determining next background task takes longer.
> Explore the way to mitigate this concurrency issue.
--
This message was sent by Atlassian JIRA
(v6.3.4#6332)
