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HBASE-27632 Refactor WAL.Reader implementation so we can better suppo… - #5055
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The PR is big, but most files are just boiler plate changes as we changed the class name for reading a WAL file. The most important things are:
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OK, good. All green! |
| /** | ||
| * Get the current reading position. | ||
| */ | ||
| long getPosition() throws IOException; |
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I noticed that WALTailingReader and WALStreamReader these two interfaces both declare this method, totally same. Then the specific implementation classes ProtobufWALStreamReader and ProtobufWALTailingReader do not implement it, but implements it through the parent abstract class AbstractProtobufWALReader.
So I think maybe you can delete it in these two interfaces.
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The upper layer can only get a WALTailingReader or WALStreamReader, they can not see the AbstractProtobufWALReader... So if we remove this method from these two interfaces, the upper layer classes can not use this method any more...
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Got it. Thank you.
I've read through the entire patch as best I can, and haven't found anything wrong.
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…rt WAL splitting and replication
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| coprocessorHost.postReplayWALs(this.getRegionInfo(), edits); | ||
| } | ||
| } catch (EOFException eof) { | ||
| Path p = WALSplitUtil.moveAsideBadEditsFile(walFS, edits); |
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Have we never ignored EOF before?
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In the old ProtobufLogReader implementation, usually we will not throw EOFException out, so in the past this is not a big problem. But anyway, we could open a issue to backport this change to branch-2.x.
| /** | ||
| * When outside clients need to consume persisted WALs, they rely on a provided Reader. | ||
| */ | ||
| interface Reader extends Closeable { |
| } catch (EOFException e) { | ||
| throw new WALHeaderEOFException("EOF while reading PB WAL magic", e); | ||
| } | ||
| if (!Arrays.equals(PB_WAL_MAGIC, magic)) { |
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Is it our first time checking PB_WAL_MAGIC? I found out we just skip its bytes length before.
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Yes, in the old implementation we just skip these bytes. I think it is OK here as the magic is short so we will not add too much pressure?
| return header; | ||
| } | ||
| private void initDecryptor(WALProtos.WALHeader header) throws IOException { |
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Great! we merge SecureProtobufLogReader and ProtobufLogReader here.
| // is a partial trailer | ||
| return true; | ||
| } | ||
| if (r != 0) { |
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Is the length of the current HBase implementation WALTrailer all 0?
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Yes, there is nothing in the trailer yet. There is a UT to confirm this, see this line
| } | ||
| private Reader getReader(String wal) throws IOException { | ||
| private WALStreamReader getReader(String wal) throws IOException { |
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Why didn't we use TailingReader in this replication scenario?
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This is WAL replay. Although it is part of the sync replication implementation, it is not for 'replicating' data, it does not need to tail the WAL file, just read the file once and replay the edits.
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Apache9 added a commit
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Mar 10, 2023
…rt WAL splitting and replication (#5055) Signed-off-by: GeorryHuang <huangzhuoyue@apache.org> (cherry picked from commit e48c448) Conflicts: hbase-server/src/main/java/org/apache/hadoop/hbase/replication/regionserver/ReplaySyncReplicationWALCallable.java hbase-server/src/main/java/org/apache/hadoop/hbase/replication/regionserver/WALEntryStream.java hbase-server/src/test/java/org/apache/hadoop/hbase/regionserver/wal/AbstractTestProtobufLog.java hbase-server/src/test/java/org/apache/hadoop/hbase/regionserver/wal/ProtobufLogTestHelper.java hbase-server/src/test/java/org/apache/hadoop/hbase/regionserver/wal/TestCombinedAsyncWriter.java hbase-server/src/test/java/org/apache/hadoop/hbase/replication/TestSyncReplicationActive.java hbase-server/src/test/java/org/apache/hadoop/hbase/wal/TestSyncReplicationWALProvider.java hbase-server/src/test/java/org/apache/hadoop/hbase/wal/TestWALReaderOnSecureWAL.java
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…rt WAL splitting and replication