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HBASE-27885 expose metaCacheHits in MetricsConnection #5253

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HBASE-27885 expose metaCacheHits in MetricsConnection #5253

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d3d37b7
HBASE-27885 expose metaCacheHits in MetricsConnection
May 24, 2023
986f754
add a test case for getMetaCacheHits
May 25, 2023
2ea8ebd
improve test case
May 26, 2023
a825eb0
improve test case
May 27, 2023
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4 changes: 4 additions & 0 deletions hbase-client/src/main/java/org/apache/hadoop/hbase/client/MetricsConnection.java
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Original file line number Diff line number Diff line change
Expand Up @@ -552,6 +552,10 @@ public void incrMetaCacheHit() {
metaCacheHits.inc();
}

public long getMetaCacheHits() {
return metaCacheHits.getCount();
}

/** Increment the number of meta cache misses. */
public void incrMetaCacheMiss() {
metaCacheMisses.inc();
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8 changes: 8 additions & 0 deletions hbase-server/src/test/java/org/apache/hadoop/hbase/client/TestMetaCache.java
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Expand Up @@ -241,6 +241,8 @@ public void testPreserveMetaCacheOnException() throws Exception {

Exception exp;
boolean success;
long initialMetaCacheHits = metrics.getMetaCacheHits();
long initialMetaCacheMisses = metrics.getMetaCacheMisses();
for (int i = 0; i < 50; i++) {
exp = null;
success = false;
Expand All @@ -253,6 +255,12 @@ public void testPreserveMetaCacheOnException() throws Exception {
table.increment(increment);
table.delete(delete);
table.mutateRow(mutations);
// The value of the metaCacheHits counter is incremented by 6 in each round of the loop,
// for 0th iteration there will be 5 hits + 1 cache miss.
assertEquals(initialMetaCacheHits + 6 * i + 5, metrics.getMetaCacheHits());
// We will get a cache miss only on the first request, so the value will always be
// initialMetaCacheMisses + 1
assertEquals(initialMetaCacheMisses + 1, metrics.getMetaCacheMisses());
} catch (IOException ex) {
// Only keep track of the last exception that updated the meta cache
if (ClientExceptionsUtil.isMetaClearingException(ex) || success) {
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