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From "Gopinathan A (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-6040) Use block encoding and HBase handled checksum verification in bulk loading using HFileOutputFormat
Date Tue, 05 Jun 2012 11:17:23 GMT

    [ https://issues.apache.org/jira/browse/HBASE-6040?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13289334#comment-13289334
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Gopinathan A commented on HBASE-6040:
-------------------------------------

Need to take care some more things for block encoding in case bulk load. 

Getting following exception while scanning the table. 
{noformat}
2012-06-05 15:39:24,771 ERROR org.apache.hadoop.hbase.regionserver.HRegionServer: Failed openScanner
java.lang.AssertionError: Expected on-disk data block encoding NONE, got PREFIX
	at org.apache.hadoop.hbase.io.hfile.HFileDataBlockEncoderImpl.diskToCacheFormat(HFileDataBlockEncoderImpl.java:151)
	at org.apache.hadoop.hbase.io.hfile.HFileReaderV2.readBlock(HFileReaderV2.java:329)
	at org.apache.hadoop.hbase.io.hfile.HFileReaderV2$EncodedScannerV2.seekTo(HFileReaderV2.java:951)
	at org.apache.hadoop.hbase.regionserver.StoreFileScanner.seekAtOrAfter(StoreFileScanner.java:229)
	at org.apache.hadoop.hbase.regionserver.StoreFileScanner.seek(StoreFileScanner.java:145)
	at org.apache.hadoop.hbase.regionserver.StoreScanner.<init>(StoreScanner.java:130)
	at org.apache.hadoop.hbase.regionserver.Store.getScanner(Store.java:2044)
	at org.apache.hadoop.hbase.regionserver.HRegion$RegionScannerImpl.<init>(HRegion.java:3307)
	at org.apache.hadoop.hbase.regionserver.HRegion.instantiateRegionScanner(HRegion.java:1630)
	at org.apache.hadoop.hbase.regionserver.HRegion.getScanner(HRegion.java:1622)
	at org.apache.hadoop.hbase.regionserver.HRegion.getScanner(HRegion.java:1598)
	at org.apache.hadoop.hbase.regionserver.HRegionServer.openScanner(HRegionServer.java:2317)
	at sun.reflect.GeneratedMethodAccessor34.invoke(Unknown Source)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
{noformat}

Also better to support BloomFilter in bulkload.
                
> Use block encoding and HBase handled checksum verification in bulk loading using HFileOutputFormat
> --------------------------------------------------------------------------------------------------
>
>                 Key: HBASE-6040
>                 URL: https://issues.apache.org/jira/browse/HBASE-6040
>             Project: HBase
>          Issue Type: Improvement
>          Components: mapreduce
>    Affects Versions: 0.94.0, 0.96.0
>            Reporter: Anoop Sam John
>            Assignee: Anoop Sam John
>             Fix For: 0.94.1
>
>         Attachments: HBASE-6040_94.patch, HBASE-6040_Trunk.patch
>
>
> When the data is bulk loaded using HFileOutputFormat, we are not using the block encoding
and the HBase handled checksum features..  When the writer is created for making the HFile,
I am not seeing any such info passing to the WriterBuilder.
> In HFileOutputFormat.getNewWriter(byte[] family, Configuration conf), we dont have these
info and do not pass also to the writer... So those HFiles will not have these optimizations..
> Later in LoadIncrementalHFiles.copyHFileHalf(), where we physically divide one HFile(created
by the MR) iff it can not belong to just one region, I can see we pass the datablock encoding
details and checksum details to the new HFile writer. But this step wont happen normally I
think..

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