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From "Sushanth Sowmyan (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HIVE-7803) Enable Hadoop speculative execution may cause corrupt output directory (dynamic partition)
Date Sat, 01 Nov 2014 21:32:34 GMT

     [ https://issues.apache.org/jira/browse/HIVE-7803?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Sushanth Sowmyan updated HIVE-7803:
-----------------------------------
    Resolution: Fixed
        Status: Resolved  (was: Patch Available)

(Closing as duplicate without committing, since this functionality is subsumed and improved
by HIVE-8394)

> Enable Hadoop speculative execution may cause corrupt output directory (dynamic partition)
> ------------------------------------------------------------------------------------------
>
>                 Key: HIVE-7803
>                 URL: https://issues.apache.org/jira/browse/HIVE-7803
>             Project: Hive
>          Issue Type: Bug
>          Components: HCatalog
>    Affects Versions: 0.13.1
>         Environment: 
>            Reporter: Selina Zhang
>            Assignee: Selina Zhang
>            Priority: Critical
>         Attachments: HIVE-7803.1.patch, HIVE-7803.2.patch
>
>
> One of our users reports they see intermittent failures due to attempt directories in
the input paths. We found with speculative execution turned on, two mappers tried to commit
task at the same time using the same committed task path,  which cause the corrupt output
directory. 
> The original Pig script:
> {code}
> STORE AdvertiserDataParsedClean INTO '$DB_NAME.$ADVERTISER_META_TABLE_NAME'
> USING org.apache.hcatalog.pig.HCatStorer();
> {code}
> Two mappers
> attempt_1405021984947_5394024_m_000523_0: KILLED
> attempt_1405021984947_5394024_m_000523_1: SUCCEEDED
> attempt_1405021984947_5394024_m_000523_0 was killed right after the commit.
> As a result, it created corrupt directory as 
>   
> /projects/.../tablename/_DYN0.7192688458252056/load_time=201408050000/type=complete/_temporary/1/task_1405021984947_5394024_m_000523/
> containing 
>    part-m-00523 (from attempt_1405021984947_5394024_m_000523_0)
> and 
>    attempt_1405021984947_5394024_m_000523_1/part-m-00523
> Namenode Audit log
> ==========================
> 1. 2014-08-05 05:04:36,811 INFO FSNamesystem.audit: ugi=* ip=ipaddress1 cmd=create 
> src=/projects/.../tablename/_DYN0.7192688458252056/load_time=201408050000/type=complete/_temporary/1/_temporary/attempt_1405021984947_5394024_m_000523_0/part-m-00523
>  dst=null  perm=user:group:rw-r-----
> 2. 2014-08-05 05:04:53,112 INFO FSNamesystem.audit: ugi=* ip=ipaddress2  cmd=create 
> src=/projects/.../tablename/_DYN0.7192688458252056/load_time=201408050000/type=complete/_temporary/1/_temporary/attempt_1405021984947_5394024_m_000523_1/part-m-00523
>  dst=null  perm=user:group:rw-r-----
> 3. 2014-08-05 05:05:13,001 INFO FSNamesystem.audit: ugi=* ip=ipaddress1 cmd=rename 
> src=/projects/.../tablename/_DYN0.7192688458252056/load_time=201408050000/type=complete/_temporary/1/_temporary/attempt_1405021984947_5394024_m_000523_0
> dst=/projects/.../tablename/_DYN0.7192688458252056/load_time=201408050000/type=complete/_temporary/1/task_1405021984947_5394024_m_000523
> perm=user:group:rwxr-x---
> 4. 2014-08-05 05:05:13,004 INFO FSNamesystem.audit: ugi=* ip=ipaddress2  cmd=rename 
> src=/projects/.../tablename/_DYN0.7192688458252056/load_time=201408050000/type=complete/_temporary/1/_temporary/attempt_1405021984947_5394024_m_000523_1
> dst=/projects/.../tablename/_DYN0.7192688458252056/load_time=201408050000/type=complete/_temporary/1/task_1405021984947_5394024_m_000523
> perm=user:group:rwxr-x---
> After consulting our Hadoop core team, we was pointed out some HCat code does not participating
in the two-phase commit protocol, for example in FileRecordWriterContainer.close():
> {code}
>             for (Map.Entry<String, org.apache.hadoop.mapred.OutputCommitter> entry
: baseDynamicCommitters.entrySet()) {
>                 org.apache.hadoop.mapred.TaskAttemptContext currContext = dynamicContexts.get(entry.getKey());
>                 OutputCommitter baseOutputCommitter = entry.getValue();
>                 if (baseOutputCommitter.needsTaskCommit(currContext)) {
>                     baseOutputCommitter.commitTask(currContext);
>                 }
>             }
> {code}



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