[jira] [Resolved] (HBASE-11660) Make WAL reader follow contract for java.io.InputStream.available()

["Andrew Kyle Purtell (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/HBASE-11660?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Andrew Kyle Purtell resolved HBASE-11660.
-----------------------------------------
    Resolution: Abandoned

> Make WAL reader follow contract for java.io.InputStream.available()
> -------------------------------------------------------------------
>
>                 Key: HBASE-11660
>                 URL: https://issues.apache.org/jira/browse/HBASE-11660
>             Project: HBase
>          Issue Type: Bug
>          Components: wal
>    Affects Versions: 0.99.0, 0.98.6, 2.0.0
>            Reporter: Eric N. Hanson
>            Priority: Minor
>         Attachments: hbase-11660.01.patch
>
>
> In the process of building support to running HBase on Microsoft Azure HDInsight, I hit an issue in the HBase WAL reading process that took a lot of time to debug. The WAL reading code depends on available() for the log InputStream never returing 0 until end of file. This is not the same as the contract in java.io.InputStream for available. 
> To prevent future grief for others that may want to port HBase onto storage systems other than HDFS, I propose to change the HBase WAL reader so it does not assume that EOF has been reached when available() == 0. It instead would treat available only as described in InputStream, i.e. available() is merely the number of bytes that could be read from the stream without blocking. That could be 0 even before EOF.



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