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Fix BenchReadThroughputLatency batch read can't stop problems. #4220

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merged 5 commits into from
Mar 18, 2024
Merged

Fix BenchReadThroughputLatency batch read can't stop problems. #4220

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7afa103
Fix BenchReadThroughputLatency batch read can't stop problems.
horizonzy Feb 23, 2024
8e2bc77
address the comment.
horizonzy Feb 26, 2024
317f9e1
address the comment.
horizonzy Feb 26, 2024
aecae1a
Fix can't end problem.
horizonzy Feb 26, 2024
7004a51
Fix can't end problem.
horizonzy Feb 27, 2024
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8 changes: 4 additions & 4 deletions ...r-benchmark/src/main/java/org/apache/bookkeeper/benchmark/BenchReadThroughputLatency.java
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Original file line number Diff line number Diff line change
Expand Up @@ -78,7 +78,7 @@ private static void readLedger(ClientConfiguration conf, long ledgerId, byte[] p
BookKeeper bk = null;
long time = 0;
long entriesRead = 0;
long lastRead = 0;
long lastRead = -1;
int nochange = 0;

long absoluteLimit = 5000000;
Expand All @@ -89,7 +89,7 @@ private static void readLedger(ClientConfiguration conf, long ledgerId, byte[] p
lh = bk.openLedgerNoRecovery(ledgerId, BookKeeper.DigestType.CRC32,
passwd);
long lastConfirmed = Math.min(lh.getLastAddConfirmed(), absoluteLimit);
if (lastConfirmed == lastRead) {
if (lastConfirmed <= lastRead + 1) {
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Because we from the entry 0 to start read, so here we should make lastRead + 1 to compare with lastConfirmed.

nochange++;
if (nochange == 10) {
break;
Expand All @@ -102,14 +102,14 @@ private static void readLedger(ClientConfiguration conf, long ledgerId, byte[] p
}
long starttime = System.nanoTime();

while (entriesRead <= lastConfirmed) {
while (lastRead < lastConfirmed) {
long nextLimit = lastRead + 100000;
Enumeration<LedgerEntry> entries;
if (batchEntries <= 0) {
long readTo = Math.min(nextLimit, lastConfirmed);
entries = lh.readEntries(lastRead + 1, readTo);
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If the read is single read, we should make sure that entriesRead is less than lastConfirmed. Or the lastRead + 1 will be greater than readTo.

} else {
entries = lh.batchReadEntries(lastRead, batchEntries, -1);
entries = lh.batchReadEntries(lastRead + 1, batchEntries, -1);
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The lastRead entry already be read, so we should read next entry at the next read.

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Do we need init the lastRead to -1 instead of 0, otherwise the entry 0 can't be read

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Nice catch.

}
while (entries.hasMoreElements()) {
LedgerEntry e = entries.nextElement();
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