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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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