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MapReduce >> mail # user >> Why LineRecordWriter.write(..) is synchronized


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Sathwik B P 2013-08-08, 06:53
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Azuryy Yu 2013-08-08, 07:06
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Re: Why LineRecordWriter.write(..) is synchronized
its not hadoop forked threads, we may create a line record writer, then
call this writer concurrently.
On Aug 8, 2013 4:00 PM, "Sathwik B P" <[EMAIL PROTECTED]> wrote:

> Hi,
> Thanks for your reply.
> May I know where does hadoop fork multiple threads to use a single
> RecordWriter.
>
> regards,
> sathwik
>
> On Thu, Aug 8, 2013 at 7:06 AM, Azuryy Yu <[EMAIL PROTECTED]> wrote:
>
>> because we may use multi-threads to write a single file.
>> On Aug 8, 2013 2:54 PM, "Sathwik B P" <[EMAIL PROTECTED]> wrote:
>>
>>> Hi,
>>>
>>> LineRecordWriter.write(..) is synchronized. I did not find any other
>>> RecordWriter implementations define the write as synchronized.
>>> Any specific reason for this.
>>>
>>> regards,
>>> sathwik
>>>
>>
>
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Harsh J 2013-08-08, 10:50
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Niels Basjes 2013-08-08, 11:00
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Jay Vyas 2013-08-08, 11:53
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Sathwik B P 2013-08-08, 12:21
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Niels Basjes 2013-08-08, 13:37
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Azuryy Yu 2013-08-08, 14:22
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Harsh J 2013-08-11, 12:59
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Niels Basjes 2013-08-11, 16:02
NEW: Monitor These Apps!
elasticsearch, apache solr, apache hbase, hadoop, redis, casssandra, amazon cloudwatch, mysql, memcached, apache kafka, apache zookeeper, apache storm, ubuntu, centOS, red hat, debian, puppet labs, java, senseiDB