HDFS-14171. Performance improvement in Tailing EditLog. Contributed by Kenneth Yang.
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@ -567,7 +567,12 @@ private void initializeReplQueuesIfNecessary() {
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*/
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private boolean areThresholdsMet() {
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assert namesystem.hasWriteLock();
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int datanodeNum = blockManager.getDatanodeManager().getNumLiveDataNodes();
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// Calculating the number of live datanodes is time-consuming
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// in large clusters. Skip it when datanodeThreshold is zero.
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int datanodeNum = 0;
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if (datanodeThreshold > 0) {
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datanodeNum = blockManager.getDatanodeManager().getNumLiveDataNodes();
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}
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synchronized (this) {
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return blockSafe >= blockThreshold && datanodeNum >= datanodeThreshold;
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}
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