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From "Doug Cutting (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HADOOP-6323) Serialization should provide comparators
Date Thu, 22 Oct 2009 18:43:59 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-6323?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12768812#action_12768812
] 

Doug Cutting commented on HADOOP-6323:
--------------------------------------

> what key should be used in the metadata to specify the schema string.

This part was already implemented in HADOOP-6165.  Currently the serialization system is named
by the "Serialization-Class" metadata key.  The currently supported values for this key are:
"org.apache.hadoop.io.serializer.WritableSerialzation", "org.apache.hadoop.io.serializer.JavaSerialzation",
and "org.apache.hadoop.io.serializer.avro.AvroSerialzation".  Writable and Java serialization
implementations use the key "Serialized-Class" to the name the serialized Java class, and
Avro's serialization implementation uses the key "Avro-Schema" for the schema.  These are
currently stored by SequenceFile's metadata.

So the proposal here adds no new metadata keys or values.  It simply adds a new method to
the existing Serialization API, extending it to also support the creation of raw comparators.


> Serialization should provide comparators
> ----------------------------------------
>
>                 Key: HADOOP-6323
>                 URL: https://issues.apache.org/jira/browse/HADOOP-6323
>             Project: Hadoop Common
>          Issue Type: New Feature
>          Components: io
>            Reporter: Doug Cutting
>
> The Serialization interface should permit one to create raw comparators.

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