[jira] [Comment Edited] (HBASE-16460) Can't rebuild the BucketAllocator's data structures when BucketCache use FileIOEngine

["Anoop Sam John (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/HBASE-16460?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15451351#comment-15451351 ] 

Anoop Sam John edited comment on HBASE-16460 at 8/31/16 6:43 AM:
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Lets target this for 1.3+ versions.    Can get into older active versions if RMs favoring to do.


was (Author: anoop.hbase):
Lets target this for 1.3+ versions.  

> Can't rebuild the BucketAllocator's data structures when BucketCache use FileIOEngine
> -------------------------------------------------------------------------------------
>
>                 Key: HBASE-16460
>                 URL: https://issues.apache.org/jira/browse/HBASE-16460
>             Project: HBase
>          Issue Type: Bug
>          Components: BucketCache
>    Affects Versions: 2.0.0, 1.1.6, 1.3.1, 1.2.3, 0.98.22
>            Reporter: Guanghao Zhang
>            Assignee: Guanghao Zhang
>         Attachments: HBASE-16460-v1.patch, HBASE-16460-v2.patch, HBASE-16460-v2.patch, HBASE-16460-v3.patch, HBASE-16460-v4.patch, HBASE-16460.patch
>
>
> When bucket cache use FileIOEngine, it will rebuild the bucket allocator's data structures from a persisted map. So it should first read the map from persistence file then use the map to new a BucketAllocator. But now the code has wrong sequence in retrieveFromFile() method of BucketCache.java.
> {code}
>       BucketAllocator allocator = new BucketAllocator(cacheCapacity, bucketSizes, backingMap, realCacheSize);
>       backingMap = (ConcurrentHashMap<BlockCacheKey, BucketEntry>) ois.readObject();
> {code}



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