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Date: Wed, 14 Dec 2016 08:04:58 +0000 (UTC)
From: "Eshcar Hillel (JIRA)" <jira@apache.org>
To: issues@hbase.apache.org
Message-ID: <JIRA.13027382.1481531854000.517457.1481702698544@Atlassian.JIRA>
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References: <JIRA.13027382.1481531854000@Atlassian.JIRA> <JIRA.13027382.1481531854849@arcas>
Subject: [jira] [Updated] (HBASE-17294) External Configuration for Memory
 Compaction
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archived-at: Wed, 14 Dec 2016 08:05:00 -0000


     [ https://issues.apache.org/jira/browse/HBASE-17294?page=3Dcom.atlassi=
an.jira.plugin.system.issuetabpanels:all-tabpanel ]

Eshcar Hillel updated HBASE-17294:
----------------------------------
    Release Note:=20
This patch provides a single external knob to control memstore compaction.
Possible memstore compaction policies are:
(1) None - no memory compaction, when size threshold is exceeded data is fl=
ushed to disk
(2) Basic policy applies optimizations which modify the index to a more com=
pacted representation. This is beneficial in all access patterns. The small=
er the cells are the greater the benefit of this policy. This is the defaul=
t policy.
(3) Eager - in addition to compacting the index representation as the basic=
 policy, eager policy eliminates duplication while the data is still in mem=
ory (much like the on-disk compaction does after the data is flushed to dis=
k). This policy is most useful for applications with high data churn or sma=
ll working sets.

Memory compaction policeman be set at the column family level at table crea=
tion time:
{code}
create =E2=80=98<tablename>=E2=80=99,
   {NAME =3D> =E2=80=98<cfname>=E2=80=99,=20
    IN_MEMORY_COMPACTION =3D> =E2=80=98<NONE|BASIC|EAGER>=E2=80=99}
{code}
or as a property at the global configuration level by setting the property =
in hbase-site.xml, with BASIC being the default value:
{code}
<property>
=09<name>hbase.hregion.compacting.memstore.type</name>
=09<value><NONE|BASIC|EAGER></value>
</property>
{code}
The values used in this property can change as memstore compaction policies=
 evolve over time.

> External Configuration for Memory Compaction=20
> ---------------------------------------------
>
>                 Key: HBASE-17294
>                 URL: https://issues.apache.org/jira/browse/HBASE-17294
>             Project: HBase
>          Issue Type: Sub-task
>            Reporter: Eshcar Hillel
>            Assignee: Eshcar Hillel
>             Fix For: 2.0.0
>
>         Attachments: HBASE-17294-V01.patch, HBASE-17294-V02.patch, HBASE-=
17294-V03.patch
>
>
> We would like to have a single external knob to control memstore compacti=
on.
> Possible memstore compaction policies are none, basic, and eager.
> This sub-task allows to set this property at the column family level at t=
able creation time:
> {code}
> create =E2=80=98<tablename>=E2=80=99,
>    {NAME =3D> =E2=80=98<cfname>=E2=80=99,=20
>     IN_MEMORY_COMPACTION =3D> =E2=80=98<NONE|BASIC|EAGER>=E2=80=99}
> {code}
> or to set this at the global configuration level by setting the property =
in hbase-site.xml, with BASIC being the default value:
> {code}
> <property>
> =09<name>hbase.hregion.compacting.memstore.type</name>
> =09<value><NONE|BASIC|EAGER></value>
> </property>
> {code}
> The values used in this property can change as memstore compaction polici=
es evolve over time.



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