JiraUser created HDFS-15438:
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Summary: dfs.disk.balancer.max.disk.errors = 0 will fail the block
copy
Key: HDFS-15438
URL: https://issues.apache.org/jira/browse/HDFS-15438
Project: Hadoop HDFS
Issue Type: Bug
Components: balancer & mover
Reporter: JiraUser
In HDFS disk balancer, the config parameter "dfs.disk.balancer.max.disk.errors"
is to control the value of maximum number of errors we can ignore for a
specific move between two disks before it is abandoned.
>From the checking code, the parameter can accept value that >= 0. And setting
>the value to 0 should mean no error tolerance. However, in current code
>implementation in DiskBalancer.java. Setting the value to 0 will simple don't
>do the block copy.
{code:java}
// Gets the next block that we can copy
private ExtendedBlock getBlockToCopy(FsVolumeSpi.BlockIterator iter,
DiskBalancerWorkItem item) {
while (!iter.atEnd() && item.getErrorCount() < getMaxError(item)) {
//getMaxError = 0
try {
... //get the block
} catch (IOException e) {
item.incErrorCount();
}
if (item.getErrorCount() >= getMaxError(item)) {
item.setErrMsg("Error count exceeded.");
LOG.info("Maximum error count exceeded. Error count: {} Max error:{} ",
item.getErrorCount(), item.getMaxDiskErrors());
}
{code}
*How to fix*
Change the while loop condition and the following if statement condition to
support value 0.
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