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From "David Phillips (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HIVE-3569) RCFile requires native Hadoop library
Date Thu, 11 Oct 2012 18:05:04 GMT
David Phillips created HIVE-3569:
------------------------------------

             Summary: RCFile requires native Hadoop library
                 Key: HIVE-3569
                 URL: https://issues.apache.org/jira/browse/HIVE-3569
             Project: Hive
          Issue Type: Bug
    Affects Versions: 0.10.0
            Reporter: David Phillips


RCFile requires the native Hadoop library. It does not work when using the Java {{GzipCodec}}.

The root cause is that the two versions of {{GzipCodec.createInputStream()}} work differently.
The native version simply saves a reference to the supplied input stream. The Java version
wraps the stream in a Java {{GZIPInputStream}}, which immediately tries to read the header.

The problem occurs because the stream passed by the {{RCFile.ValueBuffer}} constructor is
empty (the buffer backing the stream is still empty at that point).

{noformat}
12/10/11 10:37:25 WARN util.NativeCodeLoader: Unable to load native-hadoop library for your
platform... using builtin-java classes where applicable
12/10/11 10:37:25 INFO io.CodecPool: Got brand-new decompressor
12/10/11 10:37:25 INFO io.CodecPool: Got brand-new decompressor
Exception in thread "main" java.io.EOFException
	at java.util.zip.GZIPInputStream.readUByte(GZIPInputStream.java:264)
	at java.util.zip.GZIPInputStream.readUShort(GZIPInputStream.java:254)
	at java.util.zip.GZIPInputStream.readHeader(GZIPInputStream.java:163)
	at java.util.zip.GZIPInputStream.<init>(GZIPInputStream.java:78)
	at java.util.zip.GZIPInputStream.<init>(GZIPInputStream.java:90)
	at org.apache.hadoop.io.compress.GzipCodec$GzipInputStream$ResetableGZIPInputStream.<init>(GzipCodec.java:92)
	at org.apache.hadoop.io.compress.GzipCodec$GzipInputStream.<init>(GzipCodec.java:101)
	at org.apache.hadoop.io.compress.GzipCodec.createInputStream(GzipCodec.java:169)
	at org.apache.hadoop.io.compress.GzipCodec.createInputStream(GzipCodec.java:179)
	at org.apache.hadoop.hive.ql.io.RCFile$ValueBuffer.<init>(RCFile.java:451)
	at org.apache.hadoop.hive.ql.io.RCFile$Reader.<init>(RCFile.java:1205)
	at org.apache.hadoop.hive.ql.io.RCFile$Reader.<init>(RCFile.java:1111)
	at org.apache.hadoop.hive.ql.io.RCFileRecordReader.<init>(RCFileRecordReader.java:52)
{noformat}

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