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Posted to common-dev@hadoop.apache.org by "Tsz Wo (Nicholas), SZE (JIRA)" <ji...@apache.org> on 2009/03/31 19:56:50 UTC

[jira] Commented: (HADOOP-5598) Implement a pure Java CRC32 calculator

    [ https://issues.apache.org/jira/browse/HADOOP-5598?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12694192#action_12694192 ] 

Tsz Wo (Nicholas), SZE commented on HADOOP-5598:
------------------------------------------------

There is a CRC class in org.apache.hadoop.io.compress.bzip2.  Looks like that it supports computing CRC32.

> Implement a pure Java CRC32 calculator
> --------------------------------------
>
>                 Key: HADOOP-5598
>                 URL: https://issues.apache.org/jira/browse/HADOOP-5598
>             Project: Hadoop Core
>          Issue Type: Improvement
>          Components: dfs
>            Reporter: Owen O'Malley
>            Assignee: Owen O'Malley
>
> We've seen a reducer writing 200MB to HDFS with replication = 1 spending a long time in crc calculation. In particular, it was spending 5 seconds in crc calculation out of a total of 6 for the write. I suspect that it is the java-jni border that is causing us grief.

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