HDFS-12487. FsDatasetSpi.isValidBlock() lacks null pointer check inside and neither do the callers. Contributed by liumi.
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@ -905,6 +905,11 @@ public class DiskBalancer {
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while (!iter.atEnd() && item.getErrorCount() < getMaxError(item)) {
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try {
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ExtendedBlock block = iter.nextBlock();
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if(null == block){
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LOG.info("NextBlock call returned null.No valid block to copy. {}",
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item.toJson());
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return block;
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}
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if (block != null) {
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// A valid block is a finalized block, we iterate until we get
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