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https://issues.apache.org/jira/browse/BEAM-8564?focusedWorklogId=389526&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-389526
]
ASF GitHub Bot logged work on BEAM-8564:
----------------------------------------
Author: ASF GitHub Bot
Created on: 19/Feb/20 17:51
Start Date: 19/Feb/20 17:51
Worklog Time Spent: 10m
Work Description: lukecwik commented on pull request #10254: [BEAM-8564]
Add LZO compression and decompression support
URL: https://github.com/apache/beam/pull/10254#discussion_r381440755
##########
File path: sdks/java/core/src/main/java/org/apache/beam/sdk/io/Compression.java
##########
@@ -152,6 +153,54 @@ public WritableByteChannel
writeCompressed(WritableByteChannel channel) throws I
}
},
+ /**
+ * LZO compression using LZO Codec. .lzo_deflate extension is specified for
the files which just
+ * use the LZO algorithm without headers.
+ *
+ * <p>The Beam Java SDK does not pull in the required libraries for LZO
compression by default, so
+ * it is the user's responsibility to declare an explicit dependency on
{@code
+ * airlift/aircompressor} and {@code presto-hadoop-apache2}. Attempts to
read or write
+ * .lzo_deflate files without {@code airlift/aircompressor} and {@code
presto-hadoop-apache2}
+ * loaded will result in {@code NoClassDefFoundError} at runtime.
+ */
+ LZO(".lzo_deflate", ".lzo_deflate") {
+ @Override
+ public ReadableByteChannel readDecompressed(ReadableByteChannel channel)
throws IOException {
+ return Channels.newChannel(
+
LzoCompression.createLzoInputStream(Channels.newInputStream(channel)));
+ }
+
+ @Override
+ public WritableByteChannel writeCompressed(WritableByteChannel channel)
throws IOException {
+ return Channels.newChannel(
+
LzoCompression.createLzoOutputStream(Channels.newOutputStream(channel)));
+ }
+ },
+
+ /**
+ * LZOP compression using LZOP Codec. .lzo extension is specified for the
files with magic bytes
+ * and headers.
+ *
Review comment:
```suggestion
*
* <p><b>Warning:</b> The LZOP codec being used does not support
concatenated LZOP streams and will
* silently ignore data after the end of the first LZOP stream.
*
```
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Issue Time Tracking
-------------------
Worklog Id: (was: 389526)
Time Spent: 11h 10m (was: 11h)
> Add LZO compression and decompression support
> ---------------------------------------------
>
> Key: BEAM-8564
> URL: https://issues.apache.org/jira/browse/BEAM-8564
> Project: Beam
> Issue Type: New Feature
> Components: sdk-java-core
> Reporter: Amogh Tiwari
> Assignee: Amogh Tiwari
> Priority: Minor
> Time Spent: 11h 10m
> Remaining Estimate: 0h
>
> LZO is a lossless data compression algorithm which is focused on compression
> and decompression speeds.
> This will enable Apache Beam sdk to compress/decompress files using LZO
> compression algorithm.
> This will include the following functionalities:
> # compress() : for compressing files into an LZO archive
> # decompress() : for decompressing files archived using LZO compression
> Appropriate Input and Output stream will also be added to enable working with
> LZO files.
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