hive-issues mailing list archives

Site index · List index
Message view « Date » · « Thread »
Top « Date » · « Thread »
From "Nemon Lou (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HIVE-12847) ORC file footer cache should be memory sensitive
Date Thu, 14 Jan 2016 01:26:39 GMT

     [ https://issues.apache.org/jira/browse/HIVE-12847?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Nemon Lou updated HIVE-12847:
-----------------------------
    Attachment: HIVE-12847.patch

This patch limits the cache memory usage to 50% of max heap size.
Having not add a new parameter to control the memory limit ,just for simplify.
The size of FileInfo is not calculated precisely, only take the bigger objects like stripeInfos,stripeStats
and fileStats into account.


> ORC file footer cache should be memory sensitive
> ------------------------------------------------
>
>                 Key: HIVE-12847
>                 URL: https://issues.apache.org/jira/browse/HIVE-12847
>             Project: Hive
>          Issue Type: Improvement
>          Components: File Formats, ORC
>    Affects Versions: 1.2.1
>            Reporter: Nemon Lou
>            Assignee: Nemon Lou
>         Attachments: HIVE-12847.patch
>
>
> The size based footer cache can not control memory usage properly.
> Having seen a HiveServer2 hang due to ORC file footer cache taking up too much heap memory.
> A simple query like "select * from orc_table limit 1" can make HiveServer2 hang.
> The input table has about 1000 ORC files and each ORC file owns about 2500 stripes.
> {noformat}
>  num     #instances         #bytes  class name
> ----------------------------------------------
>    1:     214653601    25758432120  org.apache.hadoop.hive.ql.io.orc.OrcProto$ColumnStatistics
>    3:     122233301     8800797672  org.apache.hadoop.hive.ql.io.orc.OrcProto$StringStatistics
>    5:      89439001     6439608072  org.apache.hadoop.hive.ql.io.orc.OrcProto$IntegerStatistics
>    7:       2981300      262354400  org.apache.hadoop.hive.ql.io.orc.OrcProto$StripeInformation
>    9:       2981300      143102400  org.apache.hadoop.hive.ql.io.orc.OrcProto$StripeStatistics
>   12:       2983691       71608584  org.apache.hadoop.hive.ql.io.orc.ReaderImpl$StripeInformationImpl
>   15:         80929        7121752  org.apache.hadoop.hive.ql.io.orc.OrcProto$Type
>   17:        103282        5783792  org.apache.hadoop.mapreduce.lib.input.FileSplit
>   20:         51641        3305024  org.apache.hadoop.hive.ql.exec.FetchOperator$FetchInputFormatSplit
>   21:         51641        3305024  org.apache.hadoop.hive.ql.io.orc.OrcSplit
>   31:             1         413152  [Lorg.apache.hadoop.hive.ql.exec.FetchOperator$FetchInputFormatSplit;
 
>  100:          1122          26928  org.apache.hadoop.hive.ql.io.orc.Metadata  
> {noformat}



--
This message was sent by Atlassian JIRA
(v6.3.4#6332)

Mime
View raw message