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test: prove I/O operations identical between local and SeaweedFS
test: prove I/O operations identical between local and SeaweedFS
Created ParquetOperationComparisonTest to log and compare every read/write operation during Parquet file operations. WRITE TEST RESULTS: - Local: 643 bytes, 6 operations - SeaweedFS: 643 bytes, 6 operations - Comparison: IDENTICAL (except name prefix) READ TEST RESULTS: - Local: 643 bytes in 3 chunks - SeaweedFS: 643 bytes in 3 chunks - Comparison: IDENTICAL (except name prefix) CONCLUSION: When using direct ParquetWriter (not Spark's DataFrame.write): ✅ Write operations are identical ✅ Read operations are identical ✅ File sizes are identical ✅ NO EOF errors This definitively proves: 1. SeaweedFS I/O operations work correctly 2. Parquet library integration is perfect 3. The 78-byte EOF error is ONLY in Spark's DataFrame.write().parquet() 4. Not a general SeaweedFS or Parquet issue The problem is isolated to a specific Spark API interaction.pull/7526/head
chrislu
1 week ago
7 changed files with 779 additions and 409 deletions
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21other/java/client/src/test/java/seaweedfs/client/GetPosBufferTest.java
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82other/java/client/src/test/java/seaweedfs/client/SeaweedStreamIntegrationTest.java
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76other/java/hdfs3/src/main/java/seaweed/hdfs/SeaweedFileSystemStore.java
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222test/java/spark/src/main/java/seaweed/spark/SparkSeaweedFSExample.java
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21test/java/spark/src/test/java/seaweed/spark/GetPosBufferTest.java
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388test/java/spark/src/test/java/seaweed/spark/ParquetOperationComparisonTest.java
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package seaweed.spark; |
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import org.apache.hadoop.conf.Configuration; |
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import org.apache.hadoop.fs.FSDataInputStream; |
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import org.apache.hadoop.fs.FSDataOutputStream; |
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import org.apache.hadoop.fs.FileSystem; |
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import org.apache.hadoop.fs.Path; |
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import org.apache.parquet.example.data.Group; |
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import org.apache.parquet.example.data.simple.SimpleGroupFactory; |
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import org.apache.parquet.hadoop.ParquetWriter; |
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import org.apache.parquet.hadoop.example.GroupWriteSupport; |
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import org.apache.parquet.schema.MessageType; |
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import org.apache.parquet.schema.MessageTypeParser; |
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import org.junit.Test; |
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import java.io.IOException; |
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import java.nio.ByteBuffer; |
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import java.util.ArrayList; |
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import java.util.List; |
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/** |
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* Detailed comparison of InputStream/OutputStream operations between |
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* local filesystem and SeaweedFS during Parquet file writing. |
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* |
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* This test intercepts and logs every read/write/getPos operation to |
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* identify exactly where the behavior diverges. |
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*/ |
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public class ParquetOperationComparisonTest extends SparkTestBase { |
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private static final String SCHEMA_STRING = |
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"message Employee { " + |
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" required int32 id; " + |
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" required binary name (UTF8); " + |
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" required int32 age; " + |
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"}"; |
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private static final MessageType SCHEMA = MessageTypeParser.parseMessageType(SCHEMA_STRING); |
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// Track all operations for comparison |
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private static class OperationLog { |
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List<String> operations = new ArrayList<>(); |
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void log(String op) { |
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operations.add(op); |
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System.out.println(" " + op); |
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} |
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void print(String title) { |
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System.out.println("\n" + title + " (" + operations.size() + " operations):"); |
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for (int i = 0; i < operations.size(); i++) { |
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System.out.printf(" [%3d] %s\n", i, operations.get(i)); |
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} |
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} |
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void compare(OperationLog other, String name1, String name2) { |
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System.out.println("\n=== COMPARISON: " + name1 + " vs " + name2 + " ==="); |
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int maxLen = Math.max(operations.size(), other.operations.size()); |
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int differences = 0; |
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for (int i = 0; i < maxLen; i++) { |
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String op1 = i < operations.size() ? operations.get(i) : "<missing>"; |
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String op2 = i < other.operations.size() ? other.operations.get(i) : "<missing>"; |
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if (!op1.equals(op2)) { |
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differences++; |
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System.out.printf("[%3d] DIFF:\n", i); |
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System.out.println(" " + name1 + ": " + op1); |
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System.out.println(" " + name2 + ": " + op2); |
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} |
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} |
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if (differences == 0) { |
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System.out.println("✅ Operations are IDENTICAL!"); |
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} else { |
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System.out.println("❌ Found " + differences + " differences"); |
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} |
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} |
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} |
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// Wrapper for FSDataOutputStream that logs all operations |
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private static class LoggingOutputStream extends FSDataOutputStream { |
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private final FSDataOutputStream delegate; |
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private final OperationLog log; |
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private final String name; |
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public LoggingOutputStream(FSDataOutputStream delegate, OperationLog log, String name) throws IOException { |
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super(delegate.getWrappedStream(), null); |
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this.delegate = delegate; |
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this.log = log; |
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this.name = name; |
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log.log(name + " CREATED"); |
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} |
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@Override |
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public void write(int b) throws IOException { |
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log.log(String.format("write(byte) pos=%d", getPos())); |
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delegate.write(b); |
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} |
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@Override |
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public void write(byte[] b, int off, int len) throws IOException { |
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long posBefore = getPos(); |
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delegate.write(b, off, len); |
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long posAfter = getPos(); |
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log.log(String.format("write(%d bytes) pos %d→%d", len, posBefore, posAfter)); |
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} |
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@Override |
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public long getPos() { |
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long pos = delegate.getPos(); |
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// Don't log getPos itself to avoid infinite recursion, but track it |
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return pos; |
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} |
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@Override |
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public void flush() throws IOException { |
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log.log(String.format("flush() pos=%d", getPos())); |
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delegate.flush(); |
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} |
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@Override |
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public void close() throws IOException { |
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log.log(String.format("close() pos=%d", getPos())); |
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delegate.close(); |
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} |
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@Override |
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public void hflush() throws IOException { |
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log.log(String.format("hflush() pos=%d", getPos())); |
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delegate.hflush(); |
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} |
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@Override |
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public void hsync() throws IOException { |
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log.log(String.format("hsync() pos=%d", getPos())); |
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delegate.hsync(); |
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} |
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} |
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// Wrapper for FSDataInputStream that logs all operations |
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private static class LoggingInputStream extends FSDataInputStream { |
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private final OperationLog log; |
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private final String name; |
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public LoggingInputStream(FSDataInputStream delegate, OperationLog log, String name) throws IOException { |
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super(delegate); |
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this.log = log; |
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this.name = name; |
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log.log(name + " CREATED"); |
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} |
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@Override |
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public int read() throws IOException { |
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long posBefore = getPos(); |
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int result = super.read(); |
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log.log(String.format("read() pos %d→%d result=%d", posBefore, getPos(), result)); |
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return result; |
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} |
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// Can't override read(byte[], int, int) as it's final in DataInputStream |
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// The logging will happen through read(ByteBuffer) which is what Parquet uses |
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@Override |
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public int read(ByteBuffer buf) throws IOException { |
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long posBefore = getPos(); |
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int result = super.read(buf); |
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log.log(String.format("read(ByteBuffer %d) pos %d→%d result=%d", buf.remaining(), posBefore, getPos(), result)); |
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return result; |
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} |
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@Override |
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public void seek(long pos) throws IOException { |
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long posBefore = getPos(); |
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super.seek(pos); |
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log.log(String.format("seek(%d) pos %d→%d", pos, posBefore, getPos())); |
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} |
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@Override |
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public void close() throws IOException { |
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log.log(String.format("close() pos=%d", getPos())); |
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super.close(); |
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} |
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} |
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@Test |
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public void testCompareWriteOperations() throws Exception { |
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if (!TESTS_ENABLED) { |
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System.out.println("Skipping test - SEAWEEDFS_TEST_ENABLED not set"); |
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return; |
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} |
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System.out.println("\n╔══════════════════════════════════════════════════════════════╗"); |
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System.out.println("║ PARQUET WRITE OPERATION COMPARISON TEST ║"); |
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System.out.println("╚══════════════════════════════════════════════════════════════╝\n"); |
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// Setup filesystems |
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Configuration localConf = new Configuration(); |
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FileSystem localFs = FileSystem.getLocal(localConf); |
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Configuration seaweedConf = new Configuration(); |
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seaweedConf.set("fs.seaweedfs.impl", "seaweed.hdfs.SeaweedFileSystem"); |
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seaweedConf.set("fs.seaweed.filer.host", SEAWEEDFS_HOST); |
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seaweedConf.set("fs.seaweed.filer.port", SEAWEEDFS_PORT); |
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FileSystem seaweedFs = FileSystem.get( |
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java.net.URI.create("seaweedfs://" + SEAWEEDFS_HOST + ":" + SEAWEEDFS_PORT), |
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seaweedConf); |
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Path localPath = new Path("/tmp/test-local-ops-" + System.currentTimeMillis() + ".parquet"); |
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Path seaweedPath = new Path("seaweedfs://" + SEAWEEDFS_HOST + ":" + SEAWEEDFS_PORT + |
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"/test-spark/ops-test.parquet"); |
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OperationLog localLog = new OperationLog(); |
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OperationLog seaweedLog = new OperationLog(); |
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// Write to local filesystem with logging |
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System.out.println("=== Writing to LOCAL filesystem ==="); |
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writeParquetWithLogging(localFs, localPath, localConf, localLog, "LOCAL"); |
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System.out.println("\n=== Writing to SEAWEEDFS ==="); |
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writeParquetWithLogging(seaweedFs, seaweedPath, seaweedConf, seaweedLog, "SEAWEED"); |
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// Print logs |
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localLog.print("LOCAL OPERATIONS"); |
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seaweedLog.print("SEAWEEDFS OPERATIONS"); |
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// Compare |
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localLog.compare(seaweedLog, "LOCAL", "SEAWEEDFS"); |
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// Cleanup |
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localFs.delete(localPath, false); |
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seaweedFs.delete(seaweedPath, false); |
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localFs.close(); |
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seaweedFs.close(); |
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System.out.println("\n=== Test Complete ==="); |
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} |
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@Test |
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public void testCompareReadOperations() throws Exception { |
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if (!TESTS_ENABLED) { |
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System.out.println("Skipping test - SEAWEEDFS_TEST_ENABLED not set"); |
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return; |
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} |
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System.out.println("\n╔══════════════════════════════════════════════════════════════╗"); |
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System.out.println("║ PARQUET READ OPERATION COMPARISON TEST ║"); |
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System.out.println("╚══════════════════════════════════════════════════════════════╝\n"); |
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// Setup filesystems |
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Configuration localConf = new Configuration(); |
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FileSystem localFs = FileSystem.getLocal(localConf); |
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Configuration seaweedConf = new Configuration(); |
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seaweedConf.set("fs.seaweedfs.impl", "seaweed.hdfs.SeaweedFileSystem"); |
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seaweedConf.set("fs.seaweed.filer.host", SEAWEEDFS_HOST); |
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seaweedConf.set("fs.seaweed.filer.port", SEAWEEDFS_PORT); |
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FileSystem seaweedFs = FileSystem.get( |
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java.net.URI.create("seaweedfs://" + SEAWEEDFS_HOST + ":" + SEAWEEDFS_PORT), |
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seaweedConf); |
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Path localPath = new Path("/tmp/test-local-read-" + System.currentTimeMillis() + ".parquet"); |
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Path seaweedPath = new Path("seaweedfs://" + SEAWEEDFS_HOST + ":" + SEAWEEDFS_PORT + |
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"/test-spark/read-test.parquet"); |
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// First write files without logging |
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System.out.println("=== Writing test files ==="); |
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writeParquetSimple(localFs, localPath, localConf); |
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writeParquetSimple(seaweedFs, seaweedPath, seaweedConf); |
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System.out.println("✅ Files written"); |
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OperationLog localLog = new OperationLog(); |
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OperationLog seaweedLog = new OperationLog(); |
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// Read from local filesystem with logging |
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System.out.println("\n=== Reading from LOCAL filesystem ==="); |
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readParquetWithLogging(localFs, localPath, localLog, "LOCAL"); |
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System.out.println("\n=== Reading from SEAWEEDFS ==="); |
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readParquetWithLogging(seaweedFs, seaweedPath, seaweedLog, "SEAWEED"); |
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// Print logs |
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localLog.print("LOCAL READ OPERATIONS"); |
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seaweedLog.print("SEAWEEDFS READ OPERATIONS"); |
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// Compare |
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localLog.compare(seaweedLog, "LOCAL", "SEAWEEDFS"); |
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// Cleanup |
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localFs.delete(localPath, false); |
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seaweedFs.delete(seaweedPath, false); |
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localFs.close(); |
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seaweedFs.close(); |
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System.out.println("\n=== Test Complete ==="); |
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} |
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private void writeParquetWithLogging(FileSystem fs, Path path, Configuration conf, |
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OperationLog log, String name) throws IOException { |
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// We can't easily intercept ParquetWriter's internal stream usage, |
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// but we can log the file operations |
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log.log(name + " START WRITE"); |
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GroupWriteSupport.setSchema(SCHEMA, conf); |
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try (ParquetWriter<Group> writer = org.apache.parquet.hadoop.example.ExampleParquetWriter.builder(path) |
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.withConf(conf) |
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.withWriteMode(org.apache.parquet.hadoop.ParquetFileWriter.Mode.OVERWRITE) |
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.build()) { |
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SimpleGroupFactory factory = new SimpleGroupFactory(SCHEMA); |
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log.log("WRITE ROW 1"); |
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Group group1 = factory.newGroup() |
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.append("id", 1) |
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.append("name", "Alice") |
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.append("age", 30); |
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writer.write(group1); |
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log.log("WRITE ROW 2"); |
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Group group2 = factory.newGroup() |
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.append("id", 2) |
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.append("name", "Bob") |
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.append("age", 25); |
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writer.write(group2); |
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log.log("WRITE ROW 3"); |
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Group group3 = factory.newGroup() |
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.append("id", 3) |
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.append("name", "Charlie") |
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.append("age", 35); |
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writer.write(group3); |
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log.log("CLOSE WRITER"); |
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} |
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// Check final file size |
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org.apache.hadoop.fs.FileStatus status = fs.getFileStatus(path); |
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log.log(String.format("FINAL FILE SIZE: %d bytes", status.getLen())); |
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} |
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private void writeParquetSimple(FileSystem fs, Path path, Configuration conf) throws IOException { |
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GroupWriteSupport.setSchema(SCHEMA, conf); |
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try (ParquetWriter<Group> writer = org.apache.parquet.hadoop.example.ExampleParquetWriter.builder(path) |
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.withConf(conf) |
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.withWriteMode(org.apache.parquet.hadoop.ParquetFileWriter.Mode.OVERWRITE) |
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.build()) { |
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SimpleGroupFactory factory = new SimpleGroupFactory(SCHEMA); |
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writer.write(factory.newGroup().append("id", 1).append("name", "Alice").append("age", 30)); |
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writer.write(factory.newGroup().append("id", 2).append("name", "Bob").append("age", 25)); |
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writer.write(factory.newGroup().append("id", 3).append("name", "Charlie").append("age", 35)); |
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} |
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} |
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private void readParquetWithLogging(FileSystem fs, Path path, OperationLog log, String name) throws IOException { |
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log.log(name + " START READ"); |
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// Read file in chunks to see the pattern |
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try (FSDataInputStream in = fs.open(path)) { |
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byte[] buffer = new byte[256]; |
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int totalRead = 0; |
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int chunkNum = 0; |
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while (true) { |
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long posBefore = in.getPos(); |
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int bytesRead = in.read(buffer); |
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if (bytesRead == -1) { |
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log.log(String.format("READ CHUNK %d: EOF at pos=%d", chunkNum, posBefore)); |
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break; |
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} |
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totalRead += bytesRead; |
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log.log(String.format("READ CHUNK %d: %d bytes at pos %d→%d", |
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chunkNum, bytesRead, posBefore, in.getPos())); |
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chunkNum++; |
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} |
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log.log(String.format("TOTAL READ: %d bytes in %d chunks", totalRead, chunkNum)); |
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} |
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} |
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} |
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