narendly commented on a change in pull request #809: Add system property
options to config auto compression
URL: https://github.com/apache/helix/pull/809#discussion_r385466281
##########
File path:
helix-core/src/test/java/org/apache/helix/manager/zk/TestZNRecordSizeLimit.java
##########
@@ -290,4 +292,176 @@ public void
testZNRecordSizeLimitUseZNRecordStreamingSerializer() {
System.out.println("END
testZNRecordSizeLimitUseZNRecordStreamingSerializer at " + new Date(
System.currentTimeMillis()));
}
+
+ /*
+ * Tests ZNRecordSerializer auto compression threshold.
+ * Two cases:
+ * 1. serialized data size is less than threshold and could be written to ZK.
+ * 2. serialized data size is greater than threshold, so ZkClientException
is thrown.
+ */
+ @Test(dependsOnMethods =
"testZNRecordSizeLimitUseZNRecordStreamingSerializer")
+ public void testZNRecordSerializerCompressThreshold() {
+ // Backup properties for later resetting.
+ final String compressionThresholdProperty =
+
System.getProperty(ZkSystemPropertyKeys.ZNRECORD_SERIALIZER_COMPRESS_THRESHOLD_BYTES);
+
+ ZNRecordSerializer serializer = new ZNRecordSerializer();
+
+ String root = getShortClassName();
+
+ byte[] buf = new byte[1024];
+ for (int i = 0; i < 1024; i++) {
+ buf[i] = 'a';
+ }
+ String bufStr = new String(buf);
+
+ // 1. legal-sized data gets written to zk
+ // write a znode of size less than threshold
+ int rawZnRecordSize = 900;
+ int thresholdKB = 800;
+ int compressionThreshold = thresholdKB * 1024;
+
System.setProperty(ZkSystemPropertyKeys.ZNRECORD_SERIALIZER_COMPRESS_THRESHOLD_BYTES,
+ String.valueOf(compressionThreshold));
+
+ final ZNRecord normalSizeRecord = new ZNRecord("normal-size");
+ for (int i = 0; i < rawZnRecordSize; i++) {
+ normalSizeRecord.setSimpleField(Integer.toString(i), bufStr);
+ }
+
+ String path = "/" + root + "/normal";
+ _gZkClient.createPersistent(path, true);
+ _gZkClient.writeData(path, normalSizeRecord);
+
+ ZNRecord record = _gZkClient.readData(path);
+
+ // Successfully reads the same data.
+ Assert.assertEquals(normalSizeRecord, record);
+
+ int length = serializer.serialize(record).length;
+
+ // Less than compression threshold so it is written to ZK.
+ Assert.assertTrue(length < compressionThreshold);
+
+ // 2. Large size data is not allowed to write to ZK
+ // Set raw record size to be large enough so its compressed data exceeds
the threshold.
+ rawZnRecordSize = 5000;
+ // Set the threshold to very small so compressed data size exceeds the
threshold.
+ thresholdKB = 1;
+ compressionThreshold = thresholdKB * 1024;
+
System.setProperty(ZkSystemPropertyKeys.ZNRECORD_SERIALIZER_COMPRESS_THRESHOLD_BYTES,
+ String.valueOf(compressionThreshold));
+
+ final ZNRecord largeRecord = new ZNRecord("large-size");
+ for (int i = 0; i < rawZnRecordSize; i++) {
+ largeRecord.setSimpleField(Integer.toString(i), bufStr);
+ }
+
+ path = "/" + root + "/large";
+ _gZkClient.createPersistent(path, true);
+
+ try {
+ _gZkClient.writeData(path, largeRecord);
+ Assert.fail("Data should not written to ZK because data size exceeds
threshold!");
+ } catch (ZkClientException expected) {
+ Assert.assertTrue(
+ expected.getMessage().contains(" is greater than " +
compressionThreshold + " bytes"));
+ }
+
+ // Delete the nodes.
+ _gZkClient.deleteRecursively("/" + root);
Review comment:
Nit: Good to add a TestHelper check here given how often deleteRecursively
could fail. To make sure things have been really cleaned up.
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