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Posted to dev@hbase.apache.org by "Andrew Purtell (JIRA)" <ji...@apache.org> on 2009/03/26 03:10:51 UTC
[jira] Commented: (HBASE-1192) LRU-style map for the block cache
[ https://issues.apache.org/jira/browse/HBASE-1192?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12689333#action_12689333 ]
Andrew Purtell commented on HBASE-1192:
---------------------------------------
This is what I get when I try to apply and compile the v3 patch:
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{code}
[javac] /usr/src/Hadoop/hbase-trunk/src/java/org/apache/hadoop/hbase/io/hfile/LruBlockCache.java:210: cannot find symbol
[javac] symbol : variable blockNum
[javac] location: class org.apache.hadoop.hbase.io.hfile.LruBlockCache
[javac] put(blockNum,buf);
[javac] ^
[javac] /usr/src/Hadoop/hbase-trunk/src/java/org/apache/hadoop/hbase/io/hfile/LruBlockCache.java:1140: cannot find symbol
[javac] symbol : variable STRING
[javac] location: interface org.apache.hadoop.hbase.io.HeapSize
[javac] return HeapSize.STRING + alignSize(s.length()*2);
[javac] ^
[javac] /usr/src/Hadoop/hbase-trunk/src/java/org/apache/hadoop/hbase/io/hfile/LruBlockCache.java:1140: incompatible types
[javac] found : <nulltype>
[javac] required: long
[javac] return HeapSize.STRING + alignSize(s.length()*2);
[javac] ^
[javac] /usr/src/Hadoop/hbase-trunk/src/java/org/apache/hadoop/hbase/io/hfile/LruBlockCache.java:1148: cannot find symbol
[javac] symbol : variable BYTEBUFFER
[javac] location: interface org.apache.hadoop.hbase.io.HeapSize
[javac] return HeapSize.BYTEBUFFER + alignSize(b.capacity());
[javac] ^
[javac] /usr/src/Hadoop/hbase-trunk/src/java/org/apache/hadoop/hbase/io/hfile/LruBlockCache.java:1148: incompatible types
[javac] found : <nulltype>
[javac] required: long
[javac] return HeapSize.BYTEBUFFER + alignSize(b.capacity());
[javac] ^
[javac] 5 errors
{code}
> LRU-style map for the block cache
> ---------------------------------
>
> Key: HBASE-1192
> URL: https://issues.apache.org/jira/browse/HBASE-1192
> Project: Hadoop HBase
> Issue Type: New Feature
> Components: regionserver
> Reporter: Jonathan Gray
> Assignee: Jonathan Gray
> Priority: Blocker
> Fix For: 0.20.0
>
> Attachments: hbase-1192-v1.patch, hbase-1192-v2.patch, hbase-1192-v3.patch
>
>
> We need to decide what structure to use to back the block cache. The primary decision is whether to continue using SoftReferences or to build our own structure.
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