cf1244492d
Followup patch to HADOOP-18456 as part of HADOOP-18521, ABFS ReadBufferManager buffer sharing across concurrent HTTP requests Add probes of readahead fix aid in checking safety of hadoop ABFS client across different releases. * ReadBufferManager constructor logs the fact it is safe at TRACE * AbfsInputStream declares it is fixed in toString() by including fs.azure.capability.readahead.safe" in the result. The ABFS FileSystem hasPathCapability("fs.azure.capability.readahead.safe") probe returns true to indicate the client's readahead manager has been fixed to be safe when prefetching. All Hadoop releases for which probe this returns false and for which the probe "fs.capability.etags.available" returns true at risk of returning invalid data when reading ADLS Gen2/Azure storage data. Contributed by Steve Loughran. |
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