[
https://issues.apache.org/jira/browse/HBASE-4608?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Zhihong Yu updated HBASE-4608:
------------------------------
Comment: was deleted
(was: I repeated manual decompression based on patch v20.
Still got:
{code}
12/03/09 15:58:30 DEBUG wal.SequenceFileLogWriter: Path=sea-lab-3.comp,
syncFs=true, hflush=true
Exception in thread "main" java.io.IOException: sea-lab-3.decomp,
entryStart=124, pos=1406386, end=98439940, edit=0
at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
at
sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:39)
at
sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:27)
at java.lang.reflect.Constructor.newInstance(Constructor.java:513)
at
org.apache.hadoop.hbase.regionserver.wal.SequenceFileLogReader.addFileInfoToException(SequenceFileLogReader.java:276)
at
org.apache.hadoop.hbase.regionserver.wal.SequenceFileLogReader.next(SequenceFileLogReader.java:232)
at
org.apache.hadoop.hbase.regionserver.wal.SequenceFileLogReader.next(SequenceFileLogReader.java:201)
at
org.apache.hadoop.hbase.regionserver.wal.Compressor.transformFile(Compressor.java:91)
at
org.apache.hadoop.hbase.regionserver.wal.Compressor.main(Compressor.java:58)
Caused by: java.io.IOException: //0 read 36 bytes, should read 22
at org.apache.hadoop.io.SequenceFile$Reader.next(SequenceFile.java:2118)
at org.apache.hadoop.io.SequenceFile$Reader.next(SequenceFile.java:2155)
at
org.apache.hadoop.hbase.regionserver.wal.SequenceFileLogReader.next(SequenceFileLogReader.java:230)
... 3 more
{code})
> HLog Compression
> ----------------
>
> Key: HBASE-4608
> URL: https://issues.apache.org/jira/browse/HBASE-4608
> Project: HBase
> Issue Type: New Feature
> Reporter: Li Pi
> Assignee: Li Pi
> Fix For: 0.94.0
>
> Attachments: 4608-v19.txt, 4608-v20.txt, 4608-v22.txt, 4608v1.txt,
> 4608v13.txt, 4608v13.txt, 4608v14.txt, 4608v15.txt, 4608v16.txt, 4608v17.txt,
> 4608v18.txt, 4608v5.txt, 4608v6.txt, 4608v7.txt, 4608v8fixed.txt
>
>
> The current bottleneck to HBase write speed is replicating the WAL appends
> across different datanodes. We can speed up this process by compressing the
> HLog. Current plan involves using a dictionary to compress table name, region
> id, cf name, and possibly other bits of repeated data. Also, HLog format may
> be changed in other ways to produce a smaller HLog.
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