Ctest created HBASE-23962:
-----------------------------
Summary: Improving the documentation for
hbase.regionserver.hlog.{reader, writer}.impl
Key: HBASE-23962
URL: https://issues.apache.org/jira/browse/HBASE-23962
Project: HBase
Issue Type: Improvement
Components: conf
Reporter: Ctest
*Problem*
I found out that there two configuration parameters:
`hbase.regionserver.hlog.reader.impl` and `hbase.regionserver.hlog.writer.impl`
which should be used as a pair.
There are two options for the reader: `ProtobufLogReader` and
`SecureProtobufLogReader`.
And four options for the writer: `ProtobufLogWriter`,
`SecureProtobufLogWriter`, `AsyncProtobufLogWriter` and
`SecureAsyncProtobufLogWriter`.
Using the wrong combination of the reader and the writer will throw an
exception. For example if setting the writer to SecureProtobufLogWriter and
setting the reader to ProtobufLogReader(default value), an exception will be
thrown:
{code:java}
java.io.IOException: Got unknown writer class:
SecureProtobufLogWriterjava.io.IOException: Got unknown writer class:
SecureProtobufLogWriter
at
org.apache.hadoop.hbase.regionserver.wal.ProtobufLogReader.initInternal(ProtobufLogReader.java:224)
at
org.apache.hadoop.hbase.regionserver.wal.ProtobufLogReader.initReader(ProtobufLogReader.java:173)
at
org.apache.hadoop.hbase.regionserver.wal.ReaderBase.init(ReaderBase.java:65) at
org.apache.hadoop.hbase.regionserver.wal.ProtobufLogReader.init(ProtobufLogReader.java:168)
at org.apache.hadoop.hbase.wal.WALFactory.createReader(WALFactory.java:321) at
org.apache.hadoop.hbase.wal.WALFactory.createReader(WALFactory.java:303) at
org.apache.hadoop.hbase.wal.WALFactory.createReader(WALFactory.java:291) at
org.apache.hadoop.hbase.wal.LogRecoveredEditsOutputSink.deleteOneWithFewerEntries(LogRecoveredEditsOutputSink.java:109)
at
org.apache.hadoop.hbase.wal.LogRecoveredEditsOutputSink.closeWriter(LogRecoveredEditsOutputSink.java:240)
at
org.apache.hadoop.hbase.wal.LogRecoveredEditsOutputSink$2.call(LogRecoveredEditsOutputSink.java:196)
at
org.apache.hadoop.hbase.wal.LogRecoveredEditsOutputSink$2.call(LogRecoveredEditsOutputSink.java:192)
at java.util.concurrent.FutureTask.run(FutureTask.java:266) at
java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511) at
java.util.concurrent.FutureTask.run(FutureTask.java:266) at
java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
at
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
at java.lang.Thread.run(Thread.java:748){code}
The current description of these two parameters (in the `hbase-default.xml`)
doesn’t tell the users anything about which combination is right or not.
*Improvement*
We can add some more information in the description of these two parameters in
`hbase-default.xml` to tell the users about the correct combinations.
I upload a patch for improving the description.
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