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From "Zach York (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-19435) Reopen Files for ClosedChannelException in BucketCache
Date Fri, 08 Dec 2017 00:35:00 GMT

    [ https://issues.apache.org/jira/browse/HBASE-19435?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16282810#comment-16282810
] 

Zach York commented on HBASE-19435:
-----------------------------------

I have traced the original issue to happening during/after compactions (typically major compactions).
However, this is one area of HBase I haven't dug into at all. Does anyone have any suggestions
on where to start looking? Particularly any place that has relation to the cache (flushing,
removing items, repopulating, etc).

Thanks!

> Reopen Files for ClosedChannelException in BucketCache
> ------------------------------------------------------
>
>                 Key: HBASE-19435
>                 URL: https://issues.apache.org/jira/browse/HBASE-19435
>             Project: HBase
>          Issue Type: Bug
>          Components: BucketCache
>    Affects Versions: 2.0.0, 1.3.1
>            Reporter: Zach York
>            Assignee: Zach York
>             Fix For: 1.4.1, 2.0.0-beta-1
>
>         Attachments: HBASE-19435.branch-1.001.patch, HBASE-19435.master.001.patch, HBASE-19435.master.002.patch,
HBASE-19435.master.003.patch, HBASE-19435.master.004.patch, HBASE-19435.master.005.patch,
HBASE-19435.master.006.patch, HBASE-19435.master.007.patch, HBASE-19435.master.007.patch
>
>
> When using the FileIOEngine for BucketCache, the cache will be disabled if the connection
is interrupted or closed. HBase will then get ClosedChannelExceptions trying to access the
file. After 60s, the RS will disable the cache. This causes severe read performance degradation
for workloads that rely on this cache. FileIOEngine never tries to reopen the connection.
This JIRA is to reopen files when the BucketCache encounters a ClosedChannelException.



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