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From "Nicolas Spiegelberg (JIRA)" <j...@apache.org>
Subject [jira] Created: (HADOOP-6986) SequenceFile.Reader should distinguish between Network IOE and Parsing IOE
Date Mon, 04 Oct 2010 21:36:35 GMT
SequenceFile.Reader should distinguish between Network IOE and Parsing IOE
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                 Key: HADOOP-6986
                 URL: https://issues.apache.org/jira/browse/HADOOP-6986
             Project: Hadoop Common
          Issue Type: Bug
          Components: io
    Affects Versions: 0.21.1, 0.22.0, 0.20-append
            Reporter: Nicolas Spiegelberg
            Priority: Minor
             Fix For: 0.21.1, 0.22.0, 0.20-append


The SequenceFile.Reader api should give the user an easy way to distinguish between a Network/Low-level
IOE and a Parsing IOE.  The use case appeared recently in the HBase project:

Originally, if a RegionServer got an IOE from HDFS while opening a region file, it would abort
the open and let the HMaster reassign the region.  The assumption being that this is a network
failure that will likely disappear at a later time or different partition of the network.
 However, if HBase gets parsing exceptions, we want to log the problem and continue opening
the region anyways, because parsing is an idempotent problem and retries won't fix this issue.

Although this problem was found in HBase, it seems to be a generic problem of being able to
more easily identify idempotent vs transient errors.

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