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From "Anoop Sam John (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-10434) Store Tag compression information for a WAL in its header
Date Thu, 30 Jan 2014 03:48:10 GMT

    [ https://issues.apache.org/jira/browse/HBASE-10434?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13886225#comment-13886225

Anoop Sam John commented on HBASE-10434:

bq. on KeyValue on earlier changes.
You mean the oswrite() ?
Yes CompressionContext is @InterfaceAudience.Private and this is not even a public class.
 That is why I have changed it.  So what do you say? How we can control these kind of issues
later?  Suggestions pls.

> Store Tag compression information for a WAL in its header
> ---------------------------------------------------------
>                 Key: HBASE-10434
>                 URL: https://issues.apache.org/jira/browse/HBASE-10434
>             Project: HBase
>          Issue Type: Bug
>    Affects Versions: 0.98.0
>            Reporter: Anoop Sam John
>            Assignee: Anoop Sam John
>             Fix For: 0.98.0, 0.99.0
>         Attachments: HBASE-10434.patch
> We can enable/disable tag compression along with WAL compression using the config,
> hbase.regionserver.wal.tags.enablecompression ->  Defaults to true so that compress
tags when WAL compress is ON.
> We are not storing this info abt whether a WAL containing compressed tags or not in the
WAL header and use that in the read path. So dynamic change of this in some servers may cause
issue when  an RS having this value as true have to read and split a WAL generated from n
RS where this value was false.

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