Fix leak of open hdfs files during cancellation.
Fix leak of open hdfs files during cancellation.

grundprinzip/Impala,henryr/Impala,bratatidas9/Impala-1,bowlofstew/Impala,brightchen/Impala,brightchen/Impala,XiaominZhang/Impala,brightchen/Impala,scalingdata/Impala,cchanning/Impala,gerashegalov/Impala,caseyching/Impala,theyaa/Impala,cloudera/recordservice,lnliuxing/Impala,kapilrastogi/Impala,cloudera/recordservice,kapilrastogi/Impala,lirui-intel/Impala,grundprinzip/Impala,XiaominZhang/Impala,ImpalaToGo/ImpalaToGo,placrosse/ImpalaToGo,AtScaleInc/Impala,brightchen/Impala,mapr/impala,AtScaleInc/Impala,scalingdata/Impala,cchanning/Impala,cloudera/recordservice,placrosse/ImpalaToGo,cgvarela/Impala,lirui-intel/Impala,cchanning/Impala,bowlofstew/Impala,cchanning/Impala,rampage644/impala-cut,placrosse/ImpalaToGo,rdblue/Impala,caseyching/Impala,tempbottle/Impala,XiaominZhang/Impala,AtScaleInc/Impala,tempbottle/Impala,tempbottle/Impala,henryr/Impala,ImpalaToGo/ImpalaToGo,cchanning/Impala,tempbottle/Impala,bratatidas9/Impala-1,cgvarela/Impala,ImpalaToGo/ImpalaToGo,ibmsoe/ImpalaPPC,caseyching/Impala,XiaominZhang/Impala,henryr/Impala,cloudera/recordservice,kapilrastogi/Impala,theyaa/Impala,cloudera/recordservice,ibmsoe/ImpalaPPC,tempbottle/Impala,gerashegalov/Impala,gerashegalov/Impala,cgvarela/Impala,theyaa/Impala,rdblue/Impala,theyaa/Impala,scalingdata/Impala,placrosse/ImpalaToGo,rdblue/Impala,scalingdata/Impala,tempbottle/Impala,ibmsoe/ImpalaPPC,bowlofstew/Impala,brightchen/Impala,lnliuxing/Impala,ibmsoe/ImpalaPPC,gerashegalov/Impala,XiaominZhang/Impala,caseyching/Impala,mapr/impala,AtScaleInc/Impala,AtScaleInc/Impala,grundprinzip/Impala,gistic/PublicSpatialImpala,andybab/Impala,lirui-intel/Impala,lnliuxing/Impala,cloudera/recordservice,caseyching/Impala,theyaa/Impala,ibmsoe/ImpalaPPC,gistic/PublicSpatialImpala,ImpalaToGo/ImpalaToGo,brightchen/Impala,gerashegalov/Impala,ImpalaToGo/ImpalaToGo,caseyching/Impala,rdblue/Impala,lnliuxing/Impala,rdblue/Impala,kapilrastogi/Impala,cgvarela/Impala,grundprinzip/Impala,rampage644/impala-cut,gistic/PublicSpatialImpala,brightchen/Impala,cgvarela/Impala,bowlofstew/Impala,theyaa/Impala,kapilrastogi/Impala,andybab/Impala,gistic/PublicSpatialImpala,andybab/Impala,mapr/impala,caseyching/Impala,lirui-intel/Impala,rampage644/impala-cut,bratatidas9/Impala-1,bratatidas9/Impala-1,tempbottle/Impala,gistic/PublicSpatialImpala,kapilrastogi/Impala,rdblue/Impala,grundprinzip/Impala,bratatidas9/Impala-1,cgvarela/Impala,ibmsoe/ImpalaPPC,cloudera/recordservice,lnliuxing/Impala,bratatidas9/Impala-1,bowlofstew/Impala,rampage644/impala-cut,rampage644/impala-cut,scalingdata/Impala,bowlofstew/Impala,rampage644/impala-cut,ibmsoe/ImpalaPPC,henryr/Impala,bratatidas9/Impala-1,gerashegalov/Impala,XiaominZhang/Impala,XiaominZhang/Impala,bowlofstew/Impala,henryr/Impala,andybab/Impala,placrosse/ImpalaToGo,henryr/Impala,lirui-intel/Impala,theyaa/Impala,andybab/Impala,cchanning/Impala,scalingdata/Impala,mapr/impala,lirui-intel/Impala,placrosse/ImpalaToGo,grundprinzip/Impala,cgvarela/Impala,lirui-intel/Impala,rdblue/Impala,ImpalaToGo/ImpalaToGo,AtScaleInc/Impala,kapilrastogi/Impala,mapr/impala,gistic/PublicSpatialImpala,lnliuxing/Impala,andybab/Impala,cchanning/Impala,gerashegalov/Impala,lnliuxing/Impala