[jira] Commented: (PIG-820) PERFORMANCE: The RandomSampleLoader should be changed to allow it subsume another loader

2009-07-07 Thread Ashutosh Chauhan (JIRA)

[ 
https://issues.apache.org/jira/browse/PIG-820?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12728161#action_12728161
 ] 

Ashutosh Chauhan commented on PIG-820:
--

The patch includes no unit tests as no new functionality is added or modified.

> PERFORMANCE:  The RandomSampleLoader should be changed to allow it subsume 
> another loader
> -
>
> Key: PIG-820
> URL: https://issues.apache.org/jira/browse/PIG-820
> Project: Pig
>  Issue Type: Improvement
>  Components: impl
>Affects Versions: 0.3.0, 0.4.0
>Reporter: Alan Gates
>Assignee: Ashutosh Chauhan
> Fix For: 0.4.0
>
> Attachments: pig-820.patch, pig-820_v2.patch, pig-820_v3.patch, 
> pig-820_v4.patch, pig-820_v5.patch, pig-820_v6.patch, pig-820_v7.patch, 
> pig-820_v8.patch
>
>
> Currently a sampling job requires that data already be stored in 
> BinaryStorage format, since RandomSampleLoader extends BinaryStorage.  For 
> order by this
> has mostly been acceptable, because users tend to use order by at the end of 
> their script where other MR jobs have already operated on the data and thus it
> is already being stored in BinaryStorage.  For pig scripts that just did an 
> order by, an entire MR job is required to read the data and write it out
> in BinaryStorage format.
> As we begin work on join algorithms that will require sampling, this 
> requirement to read the entire input and write it back out will not be 
> acceptable.
> Join is often the first operation of a script, and thus is much more likely 
> to trigger this useless up front translation job.
> Instead RandomSampleLoader can be changed to subsume an existing loader, 
> using the user specified loader to read the tuples while handling the skipping
> between tuples itself.  This will require the subsumed loader to implement a 
> Samplable Interface, that will look something like:
> {code}
> public interface SamplableLoader extends LoadFunc {
> 
> /**
>  * Skip ahead in the input stream.
>  * @param n number of bytes to skip
>  * @return number of bytes actually skipped.  The return semantics are
>  * exactly the same as {...@link java.io.InpuStream#skip(long)}
>  */
> public long skip(long n) throws IOException;
> 
> /**
>  * Get the current position in the stream.
>  * @return position in the stream.
>  */
> public long getPosition() throws IOException;
> }
> {code}
> The MRCompiler would then check if the loader being used to load data 
> implemented the SamplableLoader interface.  If so, rather than create an 
> initial MR
> job to do the translation it would create the sampling job, having 
> RandomSampleLoader use the user specified loader.

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[jira] Commented: (PIG-820) PERFORMANCE: The RandomSampleLoader should be changed to allow it subsume another loader

2009-07-06 Thread Hadoop QA (JIRA)

[ 
https://issues.apache.org/jira/browse/PIG-820?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12727907#action_12727907
 ] 

Hadoop QA commented on PIG-820:
---

-1 overall.  Here are the results of testing the latest attachment 
  http://issues.apache.org/jira/secure/attachment/12412695/pig-820_v8.patch
  against trunk revision 791048.

+1 @author.  The patch does not contain any @author tags.

-1 tests included.  The patch doesn't appear to include any new or modified 
tests.
Please justify why no tests are needed for this patch.

+1 javadoc.  The javadoc tool did not generate any warning messages.

+1 javac.  The applied patch does not increase the total number of javac 
compiler warnings.

+1 findbugs.  The patch does not introduce any new Findbugs warnings.

+1 release audit.  The applied patch does not increase the total number of 
release audit warnings.

+1 core tests.  The patch passed core unit tests.

+1 contrib tests.  The patch passed contrib unit tests.

Test results: 
http://hudson.zones.apache.org/hudson/job/Pig-Patch-minerva.apache.org/114/testReport/
Findbugs warnings: 
http://hudson.zones.apache.org/hudson/job/Pig-Patch-minerva.apache.org/114/artifact/trunk/build/test/findbugs/newPatchFindbugsWarnings.html
Console output: 
http://hudson.zones.apache.org/hudson/job/Pig-Patch-minerva.apache.org/114/console

This message is automatically generated.

> PERFORMANCE:  The RandomSampleLoader should be changed to allow it subsume 
> another loader
> -
>
> Key: PIG-820
> URL: https://issues.apache.org/jira/browse/PIG-820
> Project: Pig
>  Issue Type: Improvement
>  Components: impl
>Affects Versions: 0.3.0, 0.4.0
>Reporter: Alan Gates
>Assignee: Ashutosh Chauhan
> Fix For: 0.4.0
>
> Attachments: pig-820.patch, pig-820_v2.patch, pig-820_v3.patch, 
> pig-820_v4.patch, pig-820_v5.patch, pig-820_v6.patch, pig-820_v7.patch, 
> pig-820_v8.patch
>
>
> Currently a sampling job requires that data already be stored in 
> BinaryStorage format, since RandomSampleLoader extends BinaryStorage.  For 
> order by this
> has mostly been acceptable, because users tend to use order by at the end of 
> their script where other MR jobs have already operated on the data and thus it
> is already being stored in BinaryStorage.  For pig scripts that just did an 
> order by, an entire MR job is required to read the data and write it out
> in BinaryStorage format.
> As we begin work on join algorithms that will require sampling, this 
> requirement to read the entire input and write it back out will not be 
> acceptable.
> Join is often the first operation of a script, and thus is much more likely 
> to trigger this useless up front translation job.
> Instead RandomSampleLoader can be changed to subsume an existing loader, 
> using the user specified loader to read the tuples while handling the skipping
> between tuples itself.  This will require the subsumed loader to implement a 
> Samplable Interface, that will look something like:
> {code}
> public interface SamplableLoader extends LoadFunc {
> 
> /**
>  * Skip ahead in the input stream.
>  * @param n number of bytes to skip
>  * @return number of bytes actually skipped.  The return semantics are
>  * exactly the same as {...@link java.io.InpuStream#skip(long)}
>  */
> public long skip(long n) throws IOException;
> 
> /**
>  * Get the current position in the stream.
>  * @return position in the stream.
>  */
> public long getPosition() throws IOException;
> }
> {code}
> The MRCompiler would then check if the loader being used to load data 
> implemented the SamplableLoader interface.  If so, rather than create an 
> initial MR
> job to do the translation it would create the sampling job, having 
> RandomSampleLoader use the user specified loader.

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[jira] Commented: (PIG-820) PERFORMANCE: The RandomSampleLoader should be changed to allow it subsume another loader

2009-07-06 Thread Pradeep Kamath (JIRA)

[ 
https://issues.apache.org/jira/browse/PIG-820?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12727834#action_12727834
 ] 

Pradeep Kamath commented on PIG-820:


Review comments - two observations:

1. In PigStorage the skip() implementation should do an extra skip(1) if the 
byte at n-1 is not -1 (i.e. after skipping n-1, if the stream is not at EOF, 
there should be a skip(1), so that n bytes are skipped in all).

2. The comment for  getSampledTuple() contains:
{code}
   /** 
* Get the next sampled tuple from the stream. 
* Those loaders which can appropriately return the next tuple after 
* skipping in the stream(e.g. BinStorage) can in turn call their 
getNext()
* for implementing this method. Those who cannot (e.g. PigStorage) need 
to
* provide their own implementation.
* Samplers must call this method to get next tuple and should never 
directly call
* underlying loader's getNext() method.
* @return the next tuple after skipping or null if there are no more 
tuples
* to be processed.
*/

{code}

The comment can be updated to be explicit about the context in which 
getSampledTuple() would be called- something along the lines of 
{noformat}
getSampledTuple() method will be called after a call to skip(). Hence the 
loader implementation would have to handle the case wherein the current read 
position 
in the stream is not at the beginning of a record and correctly give the next 
tuple starting from the current read position. In particular, the 
implementation would need to handle the following cases:
1) The current read position for the input stream is at the beginning of the 
stream - in this case getSampledTuple() should return the tuple repesenting the 
first tuple in the stream
2) The current read position for the input stream is in the middle of a record 
- in this case getSampledTuple() should return the tuple representing the next 
record by reading forward in the stream
3) The current read position for the input stream is exactly at the beginning 
of a record - in this case getSampledTuple() should return the tuple 
representing the record at current read position
4) The current read position for the input stream is beyond end of file - in 
this case getSampledTuple() should return null
{noformat}

To keep the comment from being very verbose, the implementation details 
(whether to delegate to getNext() or not) can be omitted.


> PERFORMANCE:  The RandomSampleLoader should be changed to allow it subsume 
> another loader
> -
>
> Key: PIG-820
> URL: https://issues.apache.org/jira/browse/PIG-820
> Project: Pig
>  Issue Type: Improvement
>  Components: impl
>Affects Versions: 0.3.0, 0.4.0
>Reporter: Alan Gates
>Assignee: Ashutosh Chauhan
> Fix For: 0.4.0
>
> Attachments: pig-820.patch, pig-820_v2.patch, pig-820_v3.patch, 
> pig-820_v4.patch, pig-820_v5.patch, pig-820_v6.patch, pig-820_v7.patch
>
>
> Currently a sampling job requires that data already be stored in 
> BinaryStorage format, since RandomSampleLoader extends BinaryStorage.  For 
> order by this
> has mostly been acceptable, because users tend to use order by at the end of 
> their script where other MR jobs have already operated on the data and thus it
> is already being stored in BinaryStorage.  For pig scripts that just did an 
> order by, an entire MR job is required to read the data and write it out
> in BinaryStorage format.
> As we begin work on join algorithms that will require sampling, this 
> requirement to read the entire input and write it back out will not be 
> acceptable.
> Join is often the first operation of a script, and thus is much more likely 
> to trigger this useless up front translation job.
> Instead RandomSampleLoader can be changed to subsume an existing loader, 
> using the user specified loader to read the tuples while handling the skipping
> between tuples itself.  This will require the subsumed loader to implement a 
> Samplable Interface, that will look something like:
> {code}
> public interface SamplableLoader extends LoadFunc {
> 
> /**
>  * Skip ahead in the input stream.
>  * @param n number of bytes to skip
>  * @return number of bytes actually skipped.  The return semantics are
>  * exactly the same as {...@link java.io.InpuStream#skip(long)}
>  */
> public long skip(long n) throws IOException;
> 
> /**
>  * Get the current position in the stream.
>  * @return position in the stream.
>  */
> public long getPosition() throws IOException;
> }
> {code}
> The MRCompiler would then check if the loader being used to load data 
> implemented the SamplableLoader interface.  If so, rather than cre

[jira] Commented: (PIG-820) PERFORMANCE: The RandomSampleLoader should be changed to allow it subsume another loader

2009-06-30 Thread Hudson (JIRA)

[ 
https://issues.apache.org/jira/browse/PIG-820?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12725602#action_12725602
 ] 

Hudson commented on PIG-820:


Integrated in Pig-trunk #490 (See 
[http://hudson.zones.apache.org/hudson/job/Pig-trunk/490/])
: Change RandomSampleLoader to take a LoadFunc instead of extending 
BinStorage.  Added new Samplable interface for loaders to implement allowing 
them to be used by RandomSampleLoader.


> PERFORMANCE:  The RandomSampleLoader should be changed to allow it subsume 
> another loader
> -
>
> Key: PIG-820
> URL: https://issues.apache.org/jira/browse/PIG-820
> Project: Pig
>  Issue Type: Improvement
>  Components: impl
>Affects Versions: 0.3.0, 0.4.0
>Reporter: Alan Gates
>Assignee: Ashutosh Chauhan
> Fix For: 0.4.0
>
> Attachments: pig-820.patch, pig-820_v2.patch, pig-820_v3.patch, 
> pig-820_v4.patch, pig-820_v5.patch, pig-820_v6.patch
>
>
> Currently a sampling job requires that data already be stored in 
> BinaryStorage format, since RandomSampleLoader extends BinaryStorage.  For 
> order by this
> has mostly been acceptable, because users tend to use order by at the end of 
> their script where other MR jobs have already operated on the data and thus it
> is already being stored in BinaryStorage.  For pig scripts that just did an 
> order by, an entire MR job is required to read the data and write it out
> in BinaryStorage format.
> As we begin work on join algorithms that will require sampling, this 
> requirement to read the entire input and write it back out will not be 
> acceptable.
> Join is often the first operation of a script, and thus is much more likely 
> to trigger this useless up front translation job.
> Instead RandomSampleLoader can be changed to subsume an existing loader, 
> using the user specified loader to read the tuples while handling the skipping
> between tuples itself.  This will require the subsumed loader to implement a 
> Samplable Interface, that will look something like:
> {code}
> public interface SamplableLoader extends LoadFunc {
> 
> /**
>  * Skip ahead in the input stream.
>  * @param n number of bytes to skip
>  * @return number of bytes actually skipped.  The return semantics are
>  * exactly the same as {...@link java.io.InpuStream#skip(long)}
>  */
> public long skip(long n) throws IOException;
> 
> /**
>  * Get the current position in the stream.
>  * @return position in the stream.
>  */
> public long getPosition() throws IOException;
> }
> {code}
> The MRCompiler would then check if the loader being used to load data 
> implemented the SamplableLoader interface.  If so, rather than create an 
> initial MR
> job to do the translation it would create the sampling job, having 
> RandomSampleLoader use the user specified loader.

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[jira] Commented: (PIG-820) PERFORMANCE: The RandomSampleLoader should be changed to allow it subsume another loader

2009-06-26 Thread Hadoop QA (JIRA)

[ 
https://issues.apache.org/jira/browse/PIG-820?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12724769#action_12724769
 ] 

Hadoop QA commented on PIG-820:
---

+1 overall.  Here are the results of testing the latest attachment 
  http://issues.apache.org/jira/secure/attachment/12411945/pig-820_v6.patch
  against trunk revision 788174.

+1 @author.  The patch does not contain any @author tags.

+1 tests included.  The patch appears to include 6 new or modified tests.

+1 javadoc.  The javadoc tool did not generate any warning messages.

+1 javac.  The applied patch does not increase the total number of javac 
compiler warnings.

+1 findbugs.  The patch does not introduce any new Findbugs warnings.

+1 release audit.  The applied patch does not increase the total number of 
release audit warnings.

+1 core tests.  The patch passed core unit tests.

+1 contrib tests.  The patch passed contrib unit tests.

Test results: 
http://hudson.zones.apache.org/hudson/job/Pig-Patch-minerva.apache.org/104/testReport/
Findbugs warnings: 
http://hudson.zones.apache.org/hudson/job/Pig-Patch-minerva.apache.org/104/artifact/trunk/build/test/findbugs/newPatchFindbugsWarnings.html
Console output: 
http://hudson.zones.apache.org/hudson/job/Pig-Patch-minerva.apache.org/104/console

This message is automatically generated.

> PERFORMANCE:  The RandomSampleLoader should be changed to allow it subsume 
> another loader
> -
>
> Key: PIG-820
> URL: https://issues.apache.org/jira/browse/PIG-820
> Project: Pig
>  Issue Type: Improvement
>  Components: impl
>Affects Versions: 0.3.0, 0.4.0
>Reporter: Alan Gates
>Assignee: Ashutosh Chauhan
> Fix For: 0.4.0
>
> Attachments: pig-820.patch, pig-820_v2.patch, pig-820_v3.patch, 
> pig-820_v4.patch, pig-820_v5.patch, pig-820_v6.patch
>
>
> Currently a sampling job requires that data already be stored in 
> BinaryStorage format, since RandomSampleLoader extends BinaryStorage.  For 
> order by this
> has mostly been acceptable, because users tend to use order by at the end of 
> their script where other MR jobs have already operated on the data and thus it
> is already being stored in BinaryStorage.  For pig scripts that just did an 
> order by, an entire MR job is required to read the data and write it out
> in BinaryStorage format.
> As we begin work on join algorithms that will require sampling, this 
> requirement to read the entire input and write it back out will not be 
> acceptable.
> Join is often the first operation of a script, and thus is much more likely 
> to trigger this useless up front translation job.
> Instead RandomSampleLoader can be changed to subsume an existing loader, 
> using the user specified loader to read the tuples while handling the skipping
> between tuples itself.  This will require the subsumed loader to implement a 
> Samplable Interface, that will look something like:
> {code}
> public interface SamplableLoader extends LoadFunc {
> 
> /**
>  * Skip ahead in the input stream.
>  * @param n number of bytes to skip
>  * @return number of bytes actually skipped.  The return semantics are
>  * exactly the same as {...@link java.io.InpuStream#skip(long)}
>  */
> public long skip(long n) throws IOException;
> 
> /**
>  * Get the current position in the stream.
>  * @return position in the stream.
>  */
> public long getPosition() throws IOException;
> }
> {code}
> The MRCompiler would then check if the loader being used to load data 
> implemented the SamplableLoader interface.  If so, rather than create an 
> initial MR
> job to do the translation it would create the sampling job, having 
> RandomSampleLoader use the user specified loader.

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[jira] Commented: (PIG-820) PERFORMANCE: The RandomSampleLoader should be changed to allow it subsume another loader

2009-06-26 Thread Pradeep Kamath (JIRA)

[ 
https://issues.apache.org/jira/browse/PIG-820?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12724717#action_12724717
 ] 

Pradeep Kamath commented on PIG-820:


+1

> PERFORMANCE:  The RandomSampleLoader should be changed to allow it subsume 
> another loader
> -
>
> Key: PIG-820
> URL: https://issues.apache.org/jira/browse/PIG-820
> Project: Pig
>  Issue Type: Improvement
>  Components: impl
>Affects Versions: 0.3.0, 0.4.0
>Reporter: Alan Gates
>Assignee: Ashutosh Chauhan
> Fix For: 0.4.0
>
> Attachments: pig-820.patch, pig-820_v2.patch, pig-820_v3.patch, 
> pig-820_v4.patch, pig-820_v5.patch, pig-820_v6.patch
>
>
> Currently a sampling job requires that data already be stored in 
> BinaryStorage format, since RandomSampleLoader extends BinaryStorage.  For 
> order by this
> has mostly been acceptable, because users tend to use order by at the end of 
> their script where other MR jobs have already operated on the data and thus it
> is already being stored in BinaryStorage.  For pig scripts that just did an 
> order by, an entire MR job is required to read the data and write it out
> in BinaryStorage format.
> As we begin work on join algorithms that will require sampling, this 
> requirement to read the entire input and write it back out will not be 
> acceptable.
> Join is often the first operation of a script, and thus is much more likely 
> to trigger this useless up front translation job.
> Instead RandomSampleLoader can be changed to subsume an existing loader, 
> using the user specified loader to read the tuples while handling the skipping
> between tuples itself.  This will require the subsumed loader to implement a 
> Samplable Interface, that will look something like:
> {code}
> public interface SamplableLoader extends LoadFunc {
> 
> /**
>  * Skip ahead in the input stream.
>  * @param n number of bytes to skip
>  * @return number of bytes actually skipped.  The return semantics are
>  * exactly the same as {...@link java.io.InpuStream#skip(long)}
>  */
> public long skip(long n) throws IOException;
> 
> /**
>  * Get the current position in the stream.
>  * @return position in the stream.
>  */
> public long getPosition() throws IOException;
> }
> {code}
> The MRCompiler would then check if the loader being used to load data 
> implemented the SamplableLoader interface.  If so, rather than create an 
> initial MR
> job to do the translation it would create the sampling job, having 
> RandomSampleLoader use the user specified loader.

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[jira] Commented: (PIG-820) PERFORMANCE: The RandomSampleLoader should be changed to allow it subsume another loader

2009-06-26 Thread Hadoop QA (JIRA)

[ 
https://issues.apache.org/jira/browse/PIG-820?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12724632#action_12724632
 ] 

Hadoop QA commented on PIG-820:
---

+1 overall.  Here are the results of testing the latest attachment 
  http://issues.apache.org/jira/secure/attachment/12411723/pig-820_v5.patch
  against trunk revision 788174.

+1 @author.  The patch does not contain any @author tags.

+1 tests included.  The patch appears to include 6 new or modified tests.

+1 javadoc.  The javadoc tool did not generate any warning messages.

+1 javac.  The applied patch does not increase the total number of javac 
compiler warnings.

+1 findbugs.  The patch does not introduce any new Findbugs warnings.

+1 release audit.  The applied patch does not increase the total number of 
release audit warnings.

+1 core tests.  The patch passed core unit tests.

+1 contrib tests.  The patch passed contrib unit tests.

Test results: 
http://hudson.zones.apache.org/hudson/job/Pig-Patch-minerva.apache.org/102/testReport/
Findbugs warnings: 
http://hudson.zones.apache.org/hudson/job/Pig-Patch-minerva.apache.org/102/artifact/trunk/build/test/findbugs/newPatchFindbugsWarnings.html
Console output: 
http://hudson.zones.apache.org/hudson/job/Pig-Patch-minerva.apache.org/102/console

This message is automatically generated.

> PERFORMANCE:  The RandomSampleLoader should be changed to allow it subsume 
> another loader
> -
>
> Key: PIG-820
> URL: https://issues.apache.org/jira/browse/PIG-820
> Project: Pig
>  Issue Type: Improvement
>  Components: impl
>Affects Versions: 0.3.0, 0.4.0
>Reporter: Alan Gates
>Assignee: Ashutosh Chauhan
> Fix For: 0.4.0
>
> Attachments: pig-820.patch, pig-820_v2.patch, pig-820_v3.patch, 
> pig-820_v4.patch, pig-820_v5.patch
>
>
> Currently a sampling job requires that data already be stored in 
> BinaryStorage format, since RandomSampleLoader extends BinaryStorage.  For 
> order by this
> has mostly been acceptable, because users tend to use order by at the end of 
> their script where other MR jobs have already operated on the data and thus it
> is already being stored in BinaryStorage.  For pig scripts that just did an 
> order by, an entire MR job is required to read the data and write it out
> in BinaryStorage format.
> As we begin work on join algorithms that will require sampling, this 
> requirement to read the entire input and write it back out will not be 
> acceptable.
> Join is often the first operation of a script, and thus is much more likely 
> to trigger this useless up front translation job.
> Instead RandomSampleLoader can be changed to subsume an existing loader, 
> using the user specified loader to read the tuples while handling the skipping
> between tuples itself.  This will require the subsumed loader to implement a 
> Samplable Interface, that will look something like:
> {code}
> public interface SamplableLoader extends LoadFunc {
> 
> /**
>  * Skip ahead in the input stream.
>  * @param n number of bytes to skip
>  * @return number of bytes actually skipped.  The return semantics are
>  * exactly the same as {...@link java.io.InpuStream#skip(long)}
>  */
> public long skip(long n) throws IOException;
> 
> /**
>  * Get the current position in the stream.
>  * @return position in the stream.
>  */
> public long getPosition() throws IOException;
> }
> {code}
> The MRCompiler would then check if the loader being used to load data 
> implemented the SamplableLoader interface.  If so, rather than create an 
> initial MR
> job to do the translation it would create the sampling job, having 
> RandomSampleLoader use the user specified loader.

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[jira] Commented: (PIG-820) PERFORMANCE: The RandomSampleLoader should be changed to allow it subsume another loader

2009-06-25 Thread Pradeep Kamath (JIRA)

[ 
https://issues.apache.org/jira/browse/PIG-820?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12724204#action_12724204
 ] 

Pradeep Kamath commented on PIG-820:


In SampleOptimizer the following should change:
{code}
// First argument is name of loader function to subsume, this we want 
to set for   
 // ourselves.
 rslargs[0] = predFs.getFuncName();
to
// First argument is name of loader function with constructor args to 
subsume, this we want to set for   
 // ourselves.
 rslargs[0] = predFs.getFuncSpec().toString();
{code}

> PERFORMANCE:  The RandomSampleLoader should be changed to allow it subsume 
> another loader
> -
>
> Key: PIG-820
> URL: https://issues.apache.org/jira/browse/PIG-820
> Project: Pig
>  Issue Type: Improvement
>  Components: impl
>Affects Versions: 0.3.0, 0.4.0
>Reporter: Alan Gates
>Assignee: Ashutosh Chauhan
> Fix For: 0.4.0
>
> Attachments: pig-820.patch, pig-820_v2.patch, pig-820_v3.patch, 
> pig-820_v4.patch, pig-820_v5.patch
>
>
> Currently a sampling job requires that data already be stored in 
> BinaryStorage format, since RandomSampleLoader extends BinaryStorage.  For 
> order by this
> has mostly been acceptable, because users tend to use order by at the end of 
> their script where other MR jobs have already operated on the data and thus it
> is already being stored in BinaryStorage.  For pig scripts that just did an 
> order by, an entire MR job is required to read the data and write it out
> in BinaryStorage format.
> As we begin work on join algorithms that will require sampling, this 
> requirement to read the entire input and write it back out will not be 
> acceptable.
> Join is often the first operation of a script, and thus is much more likely 
> to trigger this useless up front translation job.
> Instead RandomSampleLoader can be changed to subsume an existing loader, 
> using the user specified loader to read the tuples while handling the skipping
> between tuples itself.  This will require the subsumed loader to implement a 
> Samplable Interface, that will look something like:
> {code}
> public interface SamplableLoader extends LoadFunc {
> 
> /**
>  * Skip ahead in the input stream.
>  * @param n number of bytes to skip
>  * @return number of bytes actually skipped.  The return semantics are
>  * exactly the same as {...@link java.io.InpuStream#skip(long)}
>  */
> public long skip(long n) throws IOException;
> 
> /**
>  * Get the current position in the stream.
>  * @return position in the stream.
>  */
> public long getPosition() throws IOException;
> }
> {code}
> The MRCompiler would then check if the loader being used to load data 
> implemented the SamplableLoader interface.  If so, rather than create an 
> initial MR
> job to do the translation it would create the sampling job, having 
> RandomSampleLoader use the user specified loader.

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[jira] Commented: (PIG-820) PERFORMANCE: The RandomSampleLoader should be changed to allow it subsume another loader

2009-06-23 Thread Ashutosh Chauhan (JIRA)

[ 
https://issues.apache.org/jira/browse/PIG-820?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12723316#action_12723316
 ] 

Ashutosh Chauhan commented on PIG-820:
--

Thanks Alan and Pradeep for the review.

Will be incorporating SampleOptimizer changes. 
Constructor of RandomSampleLoader can only take string args since it is 
instantiated from FuncSpec on backend. So, cant make changes to types of 
RandomSampleLoader constructor argument. However, instead of String having 
classname of loader , String version of FuncSpec can be used so that loader 
with correct constructor gets instantiated.

Will be uploading a new patch soon.

> PERFORMANCE:  The RandomSampleLoader should be changed to allow it subsume 
> another loader
> -
>
> Key: PIG-820
> URL: https://issues.apache.org/jira/browse/PIG-820
> Project: Pig
>  Issue Type: Improvement
>  Components: impl
>Affects Versions: 0.3.0, 0.4.0
>Reporter: Alan Gates
>Assignee: Ashutosh Chauhan
> Fix For: 0.4.0
>
> Attachments: pig-820.patch, pig-820_v2.patch, pig-820_v3.patch
>
>
> Currently a sampling job requires that data already be stored in 
> BinaryStorage format, since RandomSampleLoader extends BinaryStorage.  For 
> order by this
> has mostly been acceptable, because users tend to use order by at the end of 
> their script where other MR jobs have already operated on the data and thus it
> is already being stored in BinaryStorage.  For pig scripts that just did an 
> order by, an entire MR job is required to read the data and write it out
> in BinaryStorage format.
> As we begin work on join algorithms that will require sampling, this 
> requirement to read the entire input and write it back out will not be 
> acceptable.
> Join is often the first operation of a script, and thus is much more likely 
> to trigger this useless up front translation job.
> Instead RandomSampleLoader can be changed to subsume an existing loader, 
> using the user specified loader to read the tuples while handling the skipping
> between tuples itself.  This will require the subsumed loader to implement a 
> Samplable Interface, that will look something like:
> {code}
> public interface SamplableLoader extends LoadFunc {
> 
> /**
>  * Skip ahead in the input stream.
>  * @param n number of bytes to skip
>  * @return number of bytes actually skipped.  The return semantics are
>  * exactly the same as {...@link java.io.InpuStream#skip(long)}
>  */
> public long skip(long n) throws IOException;
> 
> /**
>  * Get the current position in the stream.
>  * @return position in the stream.
>  */
> public long getPosition() throws IOException;
> }
> {code}
> The MRCompiler would then check if the loader being used to load data 
> implemented the SamplableLoader interface.  If so, rather than create an 
> initial MR
> job to do the translation it would create the sampling job, having 
> RandomSampleLoader use the user specified loader.

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[jira] Commented: (PIG-820) PERFORMANCE: The RandomSampleLoader should be changed to allow it subsume another loader

2009-06-23 Thread Pradeep Kamath (JIRA)

[ 
https://issues.apache.org/jira/browse/PIG-820?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12723240#action_12723240
 ] 

Pradeep Kamath commented on PIG-820:


Some review comments:
In SampleOptimizer.java, 
{noformat}
  LoadFunc lf = 
(LoadFunc)PigContext.instantiateFuncFromSpec(predLoad.getLFile().getFuncName());
 should be changed to 
  LoadFunc lf = 
(LoadFunc)PigContext.instantiateFuncFromSpec(predLoad.getLFile().getFuncSpec());
{noformat}
This is so that we correctly handle loaders which do not have default 
constuctor. FuncSpec encapsulates both the classname and constructor arguments 
and hence would handle both loaders which only have default constructor and 
those which only have constructor with args.

Similarly
{noformat}  
fs = new FileSpec(predFs.getFileName(), new FuncSpec(predFs.getFuncName()));
should be changed to
  fs = new FileSpec(predFs.getFileName(), predFs.getFuncSpec());
{noformat}

Likewise, the constructor of RandomSampleLoader should take a FuncSpec object 
as its first argument to represent the loader classname and constructor args. 
So this will require callers who create RandomSampleLoader to create it with 
correct funcspec objects.





> PERFORMANCE:  The RandomSampleLoader should be changed to allow it subsume 
> another loader
> -
>
> Key: PIG-820
> URL: https://issues.apache.org/jira/browse/PIG-820
> Project: Pig
>  Issue Type: Improvement
>  Components: impl
>Affects Versions: 0.3.0, 0.4.0
>Reporter: Alan Gates
>Assignee: Ashutosh Chauhan
> Fix For: 0.4.0
>
> Attachments: pig-820.patch, pig-820_v2.patch, pig-820_v3.patch
>
>
> Currently a sampling job requires that data already be stored in 
> BinaryStorage format, since RandomSampleLoader extends BinaryStorage.  For 
> order by this
> has mostly been acceptable, because users tend to use order by at the end of 
> their script where other MR jobs have already operated on the data and thus it
> is already being stored in BinaryStorage.  For pig scripts that just did an 
> order by, an entire MR job is required to read the data and write it out
> in BinaryStorage format.
> As we begin work on join algorithms that will require sampling, this 
> requirement to read the entire input and write it back out will not be 
> acceptable.
> Join is often the first operation of a script, and thus is much more likely 
> to trigger this useless up front translation job.
> Instead RandomSampleLoader can be changed to subsume an existing loader, 
> using the user specified loader to read the tuples while handling the skipping
> between tuples itself.  This will require the subsumed loader to implement a 
> Samplable Interface, that will look something like:
> {code}
> public interface SamplableLoader extends LoadFunc {
> 
> /**
>  * Skip ahead in the input stream.
>  * @param n number of bytes to skip
>  * @return number of bytes actually skipped.  The return semantics are
>  * exactly the same as {...@link java.io.InpuStream#skip(long)}
>  */
> public long skip(long n) throws IOException;
> 
> /**
>  * Get the current position in the stream.
>  * @return position in the stream.
>  */
> public long getPosition() throws IOException;
> }
> {code}
> The MRCompiler would then check if the loader being used to load data 
> implemented the SamplableLoader interface.  If so, rather than create an 
> initial MR
> job to do the translation it would create the sampling job, having 
> RandomSampleLoader use the user specified loader.

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[jira] Commented: (PIG-820) PERFORMANCE: The RandomSampleLoader should be changed to allow it subsume another loader

2009-06-23 Thread Alan Gates (JIRA)

[ 
https://issues.apache.org/jira/browse/PIG-820?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12723204#action_12723204
 ] 

Alan Gates commented on PIG-820:


+1

> PERFORMANCE:  The RandomSampleLoader should be changed to allow it subsume 
> another loader
> -
>
> Key: PIG-820
> URL: https://issues.apache.org/jira/browse/PIG-820
> Project: Pig
>  Issue Type: Improvement
>  Components: impl
>Affects Versions: 0.3.0, 0.4.0
>Reporter: Alan Gates
>Assignee: Ashutosh Chauhan
> Fix For: 0.4.0
>
> Attachments: pig-820.patch, pig-820_v2.patch, pig-820_v3.patch
>
>
> Currently a sampling job requires that data already be stored in 
> BinaryStorage format, since RandomSampleLoader extends BinaryStorage.  For 
> order by this
> has mostly been acceptable, because users tend to use order by at the end of 
> their script where other MR jobs have already operated on the data and thus it
> is already being stored in BinaryStorage.  For pig scripts that just did an 
> order by, an entire MR job is required to read the data and write it out
> in BinaryStorage format.
> As we begin work on join algorithms that will require sampling, this 
> requirement to read the entire input and write it back out will not be 
> acceptable.
> Join is often the first operation of a script, and thus is much more likely 
> to trigger this useless up front translation job.
> Instead RandomSampleLoader can be changed to subsume an existing loader, 
> using the user specified loader to read the tuples while handling the skipping
> between tuples itself.  This will require the subsumed loader to implement a 
> Samplable Interface, that will look something like:
> {code}
> public interface SamplableLoader extends LoadFunc {
> 
> /**
>  * Skip ahead in the input stream.
>  * @param n number of bytes to skip
>  * @return number of bytes actually skipped.  The return semantics are
>  * exactly the same as {...@link java.io.InpuStream#skip(long)}
>  */
> public long skip(long n) throws IOException;
> 
> /**
>  * Get the current position in the stream.
>  * @return position in the stream.
>  */
> public long getPosition() throws IOException;
> }
> {code}
> The MRCompiler would then check if the loader being used to load data 
> implemented the SamplableLoader interface.  If so, rather than create an 
> initial MR
> job to do the translation it would create the sampling job, having 
> RandomSampleLoader use the user specified loader.

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[jira] Commented: (PIG-820) PERFORMANCE: The RandomSampleLoader should be changed to allow it subsume another loader

2009-06-22 Thread Ashutosh Chauhan (JIRA)

[ 
https://issues.apache.org/jira/browse/PIG-820?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12722706#action_12722706
 ] 

Ashutosh Chauhan commented on PIG-820:
--

In the patch RandomSampleLoader is marked as serializable and loader field in 
it is marked as transient. Since loader is  initialized in constructor and is 
used later on findbugs is complaining : "This class contains a field that is 
updated at multiple places in the class, thus it seems to be part of the state 
of the class.However, since the field is marked as transient and not set in 
readObject or readResolve, it will contain the default value in any 
deserialized instance of the class. " However there is no need for 
RandomSampleLoader to implement Serializable anyway (and thus loader to be 
marked as transient) because loader is reconstructed from FunSpec later on. 
Because of this reason, both PigStorage and BinStorage also doesnt implement 
serializable. Will be submitting a new patch with the required changes.


> PERFORMANCE:  The RandomSampleLoader should be changed to allow it subsume 
> another loader
> -
>
> Key: PIG-820
> URL: https://issues.apache.org/jira/browse/PIG-820
> Project: Pig
>  Issue Type: Improvement
>  Components: impl
>Affects Versions: 0.3.0, 0.4.0
>Reporter: Alan Gates
>Assignee: Alan Gates
> Attachments: pig-820.patch
>
>
> Currently a sampling job requires that data already be stored in 
> BinaryStorage format, since RandomSampleLoader extends BinaryStorage.  For 
> order by this
> has mostly been acceptable, because users tend to use order by at the end of 
> their script where other MR jobs have already operated on the data and thus it
> is already being stored in BinaryStorage.  For pig scripts that just did an 
> order by, an entire MR job is required to read the data and write it out
> in BinaryStorage format.
> As we begin work on join algorithms that will require sampling, this 
> requirement to read the entire input and write it back out will not be 
> acceptable.
> Join is often the first operation of a script, and thus is much more likely 
> to trigger this useless up front translation job.
> Instead RandomSampleLoader can be changed to subsume an existing loader, 
> using the user specified loader to read the tuples while handling the skipping
> between tuples itself.  This will require the subsumed loader to implement a 
> Samplable Interface, that will look something like:
> {code}
> public interface SamplableLoader extends LoadFunc {
> 
> /**
>  * Skip ahead in the input stream.
>  * @param n number of bytes to skip
>  * @return number of bytes actually skipped.  The return semantics are
>  * exactly the same as {...@link java.io.InpuStream#skip(long)}
>  */
> public long skip(long n) throws IOException;
> 
> /**
>  * Get the current position in the stream.
>  * @return position in the stream.
>  */
> public long getPosition() throws IOException;
> }
> {code}
> The MRCompiler would then check if the loader being used to load data 
> implemented the SamplableLoader interface.  If so, rather than create an 
> initial MR
> job to do the translation it would create the sampling job, having 
> RandomSampleLoader use the user specified loader.

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[jira] Commented: (PIG-820) PERFORMANCE: The RandomSampleLoader should be changed to allow it subsume another loader

2009-06-20 Thread Hadoop QA (JIRA)

[ 
https://issues.apache.org/jira/browse/PIG-820?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12722286#action_12722286
 ] 

Hadoop QA commented on PIG-820:
---

-1 overall.  Here are the results of testing the latest attachment 
  http://issues.apache.org/jira/secure/attachment/12411325/pig-820.patch
  against trunk revision 786694.

+1 @author.  The patch does not contain any @author tags.

+1 tests included.  The patch appears to include 6 new or modified tests.

+1 javadoc.  The javadoc tool did not generate any warning messages.

+1 javac.  The applied patch does not increase the total number of javac 
compiler warnings.

-1 findbugs.  The patch appears to introduce 1 new Findbugs warnings.

+1 release audit.  The applied patch does not increase the total number of 
release audit warnings.

+1 core tests.  The patch passed core unit tests.

+1 contrib tests.  The patch passed contrib unit tests.

Test results: 
http://hudson.zones.apache.org/hudson/job/Pig-Patch-minerva.apache.org/96/testReport/
Findbugs warnings: 
http://hudson.zones.apache.org/hudson/job/Pig-Patch-minerva.apache.org/96/artifact/trunk/build/test/findbugs/newPatchFindbugsWarnings.html
Console output: 
http://hudson.zones.apache.org/hudson/job/Pig-Patch-minerva.apache.org/96/console

This message is automatically generated.

> PERFORMANCE:  The RandomSampleLoader should be changed to allow it subsume 
> another loader
> -
>
> Key: PIG-820
> URL: https://issues.apache.org/jira/browse/PIG-820
> Project: Pig
>  Issue Type: Improvement
>  Components: impl
>Affects Versions: 0.3.0, 0.4.0
>Reporter: Alan Gates
>Assignee: Alan Gates
> Attachments: pig-820.patch
>
>
> Currently a sampling job requires that data already be stored in 
> BinaryStorage format, since RandomSampleLoader extends BinaryStorage.  For 
> order by this
> has mostly been acceptable, because users tend to use order by at the end of 
> their script where other MR jobs have already operated on the data and thus it
> is already being stored in BinaryStorage.  For pig scripts that just did an 
> order by, an entire MR job is required to read the data and write it out
> in BinaryStorage format.
> As we begin work on join algorithms that will require sampling, this 
> requirement to read the entire input and write it back out will not be 
> acceptable.
> Join is often the first operation of a script, and thus is much more likely 
> to trigger this useless up front translation job.
> Instead RandomSampleLoader can be changed to subsume an existing loader, 
> using the user specified loader to read the tuples while handling the skipping
> between tuples itself.  This will require the subsumed loader to implement a 
> Samplable Interface, that will look something like:
> {code}
> public interface SamplableLoader extends LoadFunc {
> 
> /**
>  * Skip ahead in the input stream.
>  * @param n number of bytes to skip
>  * @return number of bytes actually skipped.  The return semantics are
>  * exactly the same as {...@link java.io.InpuStream#skip(long)}
>  */
> public long skip(long n) throws IOException;
> 
> /**
>  * Get the current position in the stream.
>  * @return position in the stream.
>  */
> public long getPosition() throws IOException;
> }
> {code}
> The MRCompiler would then check if the loader being used to load data 
> implemented the SamplableLoader interface.  If so, rather than create an 
> initial MR
> job to do the translation it would create the sampling job, having 
> RandomSampleLoader use the user specified loader.

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