Eric Hanson created HBASE-11660:
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Summary: 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
Reporter: Eric Hanson
Priority: Minor
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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