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From "stack (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HBASE-15366) Add doc, trace-level logging, and test around hfileblock
Date Thu, 21 Apr 2016 00:26:25 GMT

     [ https://issues.apache.org/jira/browse/HBASE-15366?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

stack updated HBASE-15366:
--------------------------
    Attachment: 15366.branch-1.backport.patch

Backport. No change in operation. Just added doc. and helpful trace logging. Need it in place
so other backports will go in easier, backports that fix bucketcache on branch-1.

> Add doc, trace-level logging, and test around hfileblock
> --------------------------------------------------------
>
>                 Key: HBASE-15366
>                 URL: https://issues.apache.org/jira/browse/HBASE-15366
>             Project: HBase
>          Issue Type: Sub-task
>          Components: BlockCache
>    Affects Versions: 2.0.0
>            Reporter: stack
>            Assignee: stack
>             Fix For: 2.0.0
>
>         Attachments: 15366.branch-1.backport.patch, 15366.patch, 15366v2.patch, 15366v3.patch,
15366v4.patch, 15366v4.patch
>
>
> What hfileblock is doing -- that it overreads when pulling in from hdfs to fetch the
header of the next block to save on seeks; that it caches the block and overread and then
adds an extra 13 bytes to the cached entry; that buckets in bucketcache have at least four
hfileblocks in them and so on -- was totally baffling me. This patch docs the class, adds
some trace-level logging so you can see if you are doing the right thing, and then adds a
test of file-backed bucketcache that checks that persistence is working.



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